[Botany • 2026] Sonerila plenasicola (Melastomataceae: Sonerileae) • A New Species from Central Vietnam, with Nomenclatural Notes including A New Combination, S. strigosa, and the resurrection of S. yunnanensis

 

Sonerila plenasicola 

in Hsu, Do, Truong, Hoang et Lin, 2026. 

DOI: doi.org/10.11646/phytotaxa.781.2.1

facebook.com/Darthvaderiana

 

Abstract

A new species, Sonerila plenasicola, is described from Quang Tri Province in Central Vietnam. The new species shares several morphological similarities with S. yunnanensis but differs in having leaves covered with curved strigose hairs, suprabasal acrodromous or subpinnate venation, peduncles lacking gland-tipped hispid hairs, and anthers 2.5–3 mm long. Furthermore, after detailed comparisons of type materials and additional specimens, we re-evaluated the taxonomic status of Sonerila cantonensis var. strigosa and S. yunnanensis, two names long treated as synonyms of S. cantonensis in previous studies. Based on their consistent differences in leaf morphology, indumentum, and floral structure, the former is now elevated to species rank, namely S. strigosa, a new record for the flora of Vietnam, and the latter is resurrected. We also provide updated descriptions, information on distribution, ecology and phenology, conservation status, typification notes, and a diagnostic comparison among the related taxa.

Eudicots, endemism, Flora of Vietnam, new taxon, nomenclature, plant taxonomy, Sonerileae

Sonerila plenasicola

 

TIAN-CHUAN HSU, TRUONG VAN DO, QUANG TRUNG TRUONG, HAI NAM HOANG and CHE-WEI LIN. 2026. Sonerila plenasicola (Melastomataceae, Sonerileae), A New Species from Central Vietnam, with Nomenclatural Notes including A New Combination, S. strigosa, and the resurrection of S. yunnanensis.  Phytotaxa. 781(2); 101-115. DOI: doi.org/10.11646/phytotaxa.781.2.1

[2026-10-21] 

facebook.com/Darthvaderiana/posts/10234854260761135

 

[Botany • 2026] Phylogenomic Analysis of Madagascar's Baobabs (Malvaceae: Adansonia) reveals admixed populations and supports Resurrection of a previously described species

 Approximate ranges of the six baobab species (Adansonia) of Madagascar.  

in Karimi, Grover, Wendel et Baum, 2026. 

DOI: doi.org/10.1002/tax.70176

 Photos: B & C, Nisa Karimi; D, Cyrille Cornu.

Abstract

Baobab trees (Adansonia) are iconic members of Madagascar's biota that serve as emblems for the island's unique biodiversity. Despite this recognition, many questions remain regarding evolutionary relationships and species limits within the genus. We used custom-designed targeted sequence capture data to obtain phased allelic sequences for hundreds of nuclear loci and plastomes. Using broad geographic sampling, representing all species in the genus, and including a few possible hybrid individuals, we reconstructed the population history of Malagasy baobabs using network inference methods to detect reticulation. We obtained a species tree that is well supported, but with clear cases of reticulation, most notably admixture between Adansonia rubrostipa and A. madagascariensis in northwestern Madagascar, and instances of introgression involving the widespread species, A. za. Analysis of exclusivity factors suggests elevating one variety of A. za to the species rank, and also raises the possibility, pending additional sampling, of splitting A. rubrostipa into two species. We discuss the implications of gene flow on species delimitation and diversification in the context of conservation efforts for these iconic and threatened trees. Given our results, we formally resurrect the species A. bozy from A. za var. bozy, thus raising the number of endemic Malagasy baobab species from six to seven.

Keywords: conservation, exclusivity factors, hybridization, introgression, phylogenetic networks, species delimitation

A, Approximate ranges of the six baobab species (Adansonia) of Madagascar. Samples analysed are indicated on the map by coloured points. Stars indicate sampled individuals of possible hybrid origin based on morphological traits that are intermediate between two currently recognized species;
B, Images of trees, flowers, and fruit for the six species of baobab endemic to Madagascar;
C, Photo of a flower of the possible A. za × A. perrieri individual; D, Photo of the putative A. rubrostipa × A. madagascariensis individual. 

 Photos: B & C, Nisa Karimi; D, Cyrille Cornu.

  

Nisa Karimi, Corrinne E. Grover, Jonathan F. Wendel and David A. Baum. 2026. Phylogenomic Analysis of Madagascar's Baobabs reveals admixed populations and supports Resurrection of a previously described species. TAXON. DOI: doi.org/10.1002/tax.70176 [12 July 2026]

[Botany • 2026] Beaumontia laotica (Apocynaceae) • A New Species from central Laos

 

Beaumontia laotica X.D. Ma, H.C. Xi, S. Lorphengsy & J.Y. Shen, 

in Ma, Xi, Lorphengsy et Shen, 2026.

DOI: doi.org/10.5735/085.063.0130 

Abstract

Beaumontia laotica X.D. Ma, H.C. Xi, S. Lorphengsy & J.Y. Shen (Apocynaceae) is described as a new species from Bolikhamxai Province, Laos. It closely resembles B. grandiflora, B. murtonii and B. jerdoniana, but differs from them by several features of the leaves, sepals and corolla, and by flowering in November. A full taxonomic description, diagnostic illustration and formal IUCN conservation assessment are presented for the new species. An identification key to all species of Beaumontia is provided.

Beaumontia laotica (from the holotype).
 — A: Branch. — B: Longitudinal section of flower. — C: Style-head and anther, side view. — D: Anther, adaxial view. — E: Anther, abaxial view. — F: Ovary, side view.

Beaumontia laotica (A and B photographed at type locality, 11 November 2025; C–P from the holotype).
— A: Natural habitat. — B: Habit. — C: Branch. — D: Young stem. — E: Leaf, adaxial view. — F: Leaf, abaxial view. — G: Adaxial leaf surface. — H: Abaxial leaf surface. — I: Inflorescence. — J: Bracts, adaxial views. — K: Sepals, adaxial views. — L: Flower, front view. — M: Longitudinal section of corolla showing inner surface and stamens. — N: Pedicel and pistil, side view. — O: Disc and ovary, front view. — P: Ovary, side view.

Beaumontia laotica X.D. Ma, H.C. Xi, S. Lorphengsy & J.Y. Shen, sp. nova

Diagnosis. Beaumontia laotica differs from B. grandiflora, B. murtonii and B. jerdoniana by its lanceolate or narrowly obovate (vs. elliptic or obovate) leaf blade; persistent (vs. deciduous) bracts; glabrous (vs. pubescent) sepals; and glabrous (vs. pubescent or puberulent) corolla tube, lower portion ca. 7.4 cm long (vs. 1.5–2.5 cm long), upper portion abruptly expanding to trumpet-shaped, ca. 2 cm long (vs. obconical or campanulate, 6.5–11 cm long). 

Xing-Da Ma, Hou-Cheng Xi, Sengvilay Lorphengsy and Jian-Yong Shen. 2026. Beaumontia laotica (Apocynaceae), A New Species from central Laos. Annales Botanici Fennici. 63(1), 233-237. DOI: doi.org/10.5735/085.063.0130  (11 September 2026) 

[Botany • 2026] Primula octopoda (Primulaceae) • A stoloniferous New Species from western Sichuan, China

 

Primula octopoda W.B.Ju & Q.Huang,  

in Q. Huang, X. Wang, W.-J. Huang, Yang, Pan, Ru, J.-P. Wang et Ju, 2026.

巴塘粉报春 | DOI: doi.org/10.1002/ece3.74088 

 

ABSTRACT

Primula octopoda W.B.Ju & Q.Huang, a new species of Primula (Primulaceae) in sect. Aleuritia, is herein described and illustrated from Batang County, Sichuan Province, southwestern China. Morphologically, P. octopoda is most similar to P. stenocalyx, but it can be readily distinguished by its dwarf habit, the presence of stolons 2–7 cm in length ending in small rosettes occasionally bearing a single flower, elliptic to broadly obovate leaf blades, a very short or absent scape bearing one or two flowers, and a smaller, annulate corolla with a prominent yellow eye. The complete chloroplast genome of P. octopoda spans 154,164 bp with a GC content of 36.97% and contains 125 genes. Phylogenetic analyses using plastid and ITS data both place P. octopoda within sect. Aleuritia while supporting its distinct species status. Given the current lack of adequate information on its population size and geographic range, the species is provisionally assigned a status of Data Deficient (DD) according to the IUCN Red List criteria.

Keywords: molecular phylogeny, morphology, new species, Primula, taxonomy

Habitat of the Primula octopoda.
 (A) Habitat; (B–D) Plants.

Morphology of Primula octopoda.
 (A) Plant; (B) roots; (C) leaves; (D) inflorescence; (E) corolla; (F) bracts; (G) calyx; (H) thrum flower and pin flower; (I) capsule.

Primula octopoda W.B.Ju & Q.Huang, sp. nov. 

Diagnosis. The new species most closely resembles P. stenocalyx, sharing narrowly lanceolate bracts, a tubular calyx with similarly divided oblong or lanceolate lobes, stamens and style included within the corolla tube, and an oblong capsule. However, it differs in its shorter stature, the presence of 2–7 cm long stolons each ending in a small rosette and occasionally bearing a solitary flower, elliptic to broadly obovate leaves, a scape up to 2 cm long or absent with 1–2 flowers, and an annulate corolla with a yellow eye and smaller flowers (Figures 2 and 3).

Etymology. The specific epithet of the new species refers to its distinctive feature of producing multiple stout, fleshy stolons that resemble the tentacles of an octopus; hence the name octopoda, which vividly reflects the plant's numerous stolons extending like “eight legs.”

Vernacular Name. Chinese mandarin: “bā táng fĕn bào chūn” (巴塘粉报春), meaning “Batang Farinose Primrose” in English.

 

Qin Huang, Xin Wang, Wen-Jun Huang, Jie-Yi Yang, Hong-Li Pan, Jian Ru, Jiang-Ping Wang and Wen-Bin Ju. 2026. Primula octopoda, A stoloniferous New Species from Western Sichuan, China. Ecology and Evolution. DOI: doi.org/10.1002/ece3.74088 [27 August 2026]

[Botany • 2026] Impatiens zayuensis (Balsaminaceae) • A New Species from southeastern Xizang, China

 

 Impatiens zayuensis  S.Peng, G.W.Hu & Q.F.Wang, 

in Yuan, T. Hu, Zhang, Cao, Du, Chen, Cong, G.-W. Hu, Peng et Wang, 2026. 

DOI: doi.org/10.11646/phytotaxa.751.2.7

  Researchgate.net/publication/403820090 

english.CAS.cn

Abstract

Impatiens zayuensis (Balsaminaceae), from Cibagou National Nature Reserve in southeastern Xizang, China, is described. Based on molecular evidence, I. zayuensis is assigned to I. sect. Racemosae. Morphologically, it is close to I. margaritifera and I. casseabriae in having spurless flowers, but differs in upper stem with glands, ovate lateral sepals, dentate margin of lateral sepals, sub-dolabriform or oblong lower petal, and oblique mouth of lower sepal. Phylogenetically, the new species does not cluster with the other two similar spurless species, indicating that the spurless character may have evolved several times within the I. sect. Racemosae.

Impatiens, New Species, Taxonomy, Phylogeny, Xizang, Eudicots

 Impatiens zayuensis.
 A. habitat; B. inflorescence; C-D. front view of flower; E-F. lateral view of flower; G. dissected flower (a. dorsal petal; b. lateral sepals; c. lateral united petals; d. lower sepal; e. stamens and pedicel); H. capsule and fruit stalk. I. seeds; J. leaves; K. root (Image by YUAN Taohua)

Morphological comparison of Impatiens zayuensis (A1-I1) and I. margaritifera (A2-I2).
A. inflorescences; B. the upper part of the stems (showing glands); C. leaves (showing glands at the base of the leaf blade); D. front view of flowers; E. lateral view of flowers; F. lateral sepals; G. dorsal petals; H. lateral united petals; I. lower sepals

 (1-I1 photographed by YUAN Taohua; B2-E2 by HUANG Wen; F2-I2 by PENG Shuai)

Impatiens zayuensis S.Peng, G.W.Hu & Q.F.Wang

TAO-HUA YUAN, TIAN HU, BEI ZHANG, MING CAO, ZHI DU, XIANG-YUN CHEN, YI-YAN CONG, GUANG-WAN HU, SHUAI PENG and QING-FENG WANG. 2026. A New Species of Impatiens (Balsaminaceae) from southeastern Xizang, China.  Phytotaxa. 751(2); 163-175. DOI: doi.org/10.11646/phytotaxa.751.2.7 [2026-04-15] 

Researchgate.net/publication/403820090_A_new_species_of_Impatiens_from_Tibet

 english.CAS.cn/newsroom/research-news/202605/t20260507_1158557.shtml

[Botany • 2026] Primula xideensis (Primulaceae) • A New Species from Sichuan, China, based on Morphological and Molecular Evidence

 

 Primula xideensis W.B.Ju, Hu Ju & Bo Xu,   

in J.-T. Li, X. Li, Liu, Xu, Hu, Meng et Ju, 2026. 

DOI: doi.org/10.3390/plants15121829

Abstract

We document and illustrate Primula xideensis, a new species collected from Xide County, Sichuan Province, China. Morphologically, it resembles P. stenocalyx, P. farinosa s.l., and P. pulchella, but differs by its roots densely covered with multicellular hairs; elliptic to obovate leaves with non-revolute, irregularly and deeply dentate margins, both surfaces efarinose, shortly hairy, and scabrous; tubular calyx parted to the middle; corolla mouth densely white-farinose; stamens positioned at mid-corolla tube in pin flowers and near the throat in thrum flowers; styles reciprocally placed; and an oblong capsule shorter than the persistent calyx. To clarify its phylogenetic placement, we constructed phylogenetic trees using two datasets: 63 complete chloroplast genome sequences and 75 nuclear ribosomal DNA internal transcribed spacer (nrITS) sequences. Both trees showed similar topologies, consistently placing the new species within a monophyletic group of Sect. Aleuritia, supporting its assignment to this section. For a deeper comparison between the new species and other members of Sect. Aleuritia, we incorporated chloroplast genomes of seven additional species from this section. The results revealed highly conserved chloroplast genomes among all eight species, with only minor differences between the new species and the others. Primula xideensis is currently known only from its type locality. Based on IUCN Red List criteria, its conservation status is assessed as Data Deficient (DD).

Keywords: Primula sect. Aleuritia; morphological taxonomy; chloroplast genomics; molecular phylogeny

 Habitat of Primula xideensis sp. nov.

 Primula xideensis sp. nov.
 (A) fresh plants; (B) plant base, showing the roots and withered old leaves. (C) leaves; (D) Leaf abaxial surface and indumentum; (E) Corolla; (F) Bracts and calyx; (G) pin flower; (H) capsule; (I) seed; (J) thrum flower.

 Primula xideensis sp. nov.
  (A) habit; (B) leaves; (C) Leaf indumentum; (D) Bracts and calyx; (E) flowers: pin flower, thrum flower; (F) front of the flower; (G) capsule.

Primula xideensis W.B.Ju, Hu Ju, Bo Xu sp. nov.  

 Diagnosis: Primula xideensis is most similar to P. stenocalyx, P. farinosa s.l. and P. pulchella, but differs by its roots densely covered with multicellular hairs, leaves with dentate to irregularly deeply dentate margins, both surfaces efarinose, densely short-hairy and scabrous, corolla mouth densely white-farinose, pin flowers with stamens inserted about the middle of the corolla tube and styles adjacent to the corolla throat, thrum flowers with stamens positioned near the corolla throat and styles inserted about the middle of the corolla tube, and an oblong capsule shorter than the persistent calyx.

 Jiang-Tao Li, Xiong Li, Cheng-Wu Liu, Bo Xu, Jun Hu, Fan-Juan Meng and Wen-Bin Ju. 2026. Primula xideensis (Primulaceae), A New Species from Sichuan, China, Based on Morphological and Molecular Evidence. Plants. 15(12), 1829. DOI: doi.org/10.3390/plants15121829   [12 June 2026]

[Botany • 2026] Impatiens yakandawalarum (Balsaminaceae) • A New ecalcarate Species of Impatiens from the lowland wet zone of Sri Lanka

 

 Impatiens yakandawalarum  Gopallawa, Hapuarachchi & Jayathissa, 

in Gopallawa, Hapuarachchi, Jayathissa, Gunarathna et Karunarathna, 2026. 

DOI: doi.org/10.4038/cjs.v55i4.10118  

  facebook.com/BhathiyaGopallawa

Abstract

Impatiens yakandawalarum Gopallawa, Hapuarachchi & Jayathissa, sp. nov., a new ecalcarate species from the lowland wet zone of Sri Lanka, is described and illustrated based on morphological evidence. The species was discovered on a wet rocky slope at Manna Kathi Ella, Kitulgala, Kegalle District, and represents the first Sri Lankan Impatiens characterized by a consistently ecalcarate lower sepal across the examined population and material. It is distinguished by a completely ecalcarate navicular lower sepal, a fleshy, globose to subglobose subterranean storage organ, and glabrous leaves. The flowers superficially resemble those of Impatiens thwaitesii Hook.f. ex Grey-Wilson, while the habit shows similarities to Impatiens janthina Thwaites. A description, illustrations, comparisons, and a preliminary conservation assessment are provided.

Keywords: ecalcarate, endemic species, Kitulgala, lithophyte, fleshy subterranean storage organ

Floral and vegetative morphology of Impatiens yakandawalarum sp. nov.
  A. Flower, frontal view. B. Dissected floral parts showing dorsal petal, lateral petals, lateral sepals. C. Androecium. D. Fruiting capsule. E. Dehisced capsule and seeds. F. Cross section of seed capsule. G. Lower sepal, inner and lateral views. H. Flower, lateral view. I. Flower, rear view. J. Floral bracts. K. Flower buds, lateral and dorsal views. L. Leaf variation, adaxial and abaxial surfaces. M. Leaf margin. N. Habit. O. Basal stem and fibrous roots. P. Longitudinal section of fleshy, globose to subglobose subterranean storage organ. Q. Fleshy, globose to subglobose subterranean storage organ with fibrous roots. Scale bars as indicated

Impatiens yakandawalarum Gopallawa, Hapuarachchi & Jayathissa, sp. nov.

Diagnosis: Impatiens yakandawalarum differs from I. thwaitesii in possessing a globose to subglobose subterranean storage organ (vs absent), glabrous leaves (vs pubescent adaxially), terminal 2 – 3-flowered, umbel-like racemes (vs 6- to many-flowered subumbellate racemes), and a completely ecalcarate navicular lower sepal with a linear series of purplish-pink internal spots (vs a spurred lower sepal without such a linear series). It differs from I. janthina in its branched, 4 – 6 mm thick stem, terminal 2 – 3-flowered racemes with peduncles 5 – 16 cm long, completely ecalcarate lower sepal, and elongate-fusiform capsules.

Etymology: The specific epithet honours Professor Deepthi Yakandawala and Professor Kapila Yakandawala for their contributions to plant taxonomy, systematics, forestry, conservation and botanical research in Sri Lanka. As the epithet commemorates two people sharing the surname Yakandawala, yakandawalarum is formed as a genitive plural by adding -rum to a personal name ending in -a, in accordance with Art. 60.8 of the International Code of Nomenclature for algae, fungi, and plants (Turland et al., 2025). 

Proposed common names E. Kitulgala Balsam,
S. කිතුල්ගල කූඩලු

Bhathiya Gopallawa, S. I. Hapuarachchi, Chathura Jayathissa, S. S. Gunarathna and Peshala Pasan Karunarathna. 2026. A New ecalcarate Species of Impatiens (Balsaminaceae) from the lowland wet zone of Sri Lanka. Ceylon Journal of Science. 55(4); 1424-1433. DOI: doi.org/10.4038/cjs.v55i4.10118 [Sep 30, 2026] 

  facebook.com/BhathiyaGopallawa/posts/28540718478914200

  facebook.com/PeshalaPasanKarunarathna/posts/28437253622595529

[Botany • 2026] Vincetoxicum phucanhense (Apocynaceae: Asclepiadoideae) • A New Species from Vietnam

 

Vincetoxicum phucanhense T.T.H. Nguyen & T.H. Bui, 

in Nguyen, Le, D.B. Tran, T.B. Tran et Bui, 2026

 DOI: doi.org/10.3897/phytokeys.279.203612

Abstract

Vincetoxicum phucanhense (Apocynaceae, Asclepiadoideae), a new species from Vietnam, is described, illustrated, and compared with three morphologically similar species: Vincetoxicum flexuosum (R.Br.) Kuntze, V. harmandii (Costantin) Meve & Liede, and V. tengii (Tsiang) Meve & Liede. V. phucanhense differs from V. flexuosum in having shorter pedicels, very sparsely hairy sepal margins (vs. glabrous), a larger corolla, broadly elliptic pollinia (vs. globose), longer fruits, and longer seeds. It also differs from V. harmandii in having shorter petioles, smaller leaf blades, glabrous adaxial leaf surfaces (vs. hairy), and a larger corolla. In comparison with V. tengii, V. phucanhense can be distinguished by its larger corolla, corolla coloration (yellow, pink, or red vs. greenish), and broadly elliptic pollinia (vs. globose). A key to the 14 species of Vincetoxicum recorded in Vietnam is provided.

Key words: Asclepiadeae, Phu Canh, Phu Tho, Tylophora, Tylophorinae

Vincetoxicum phucanhense.
A. Habitat; B, C. Flowering branches; D. Magnified portion of branch showing one row of pubescence; E. Adaxial leaf surface; F. Abaxial leaf surface; G. Inflorescence.

Photos by D.B. Tran.

Vincetoxicum phucanhense T.T.H. Nguyen & T.H. Bui, sp. nov.

Diagnosis. Vincetoxicum phucanhense differs from V. flexuosum by its shorter pedicels (4.0–7.6 mm vs. 14.0–16.0 mm), sparsely hairy sepal margins, larger corolla (7.2–9.6 mm diam, vs. 4.0–6.0 mm), broadly elliptic pollinia, longer fruits (109–123 mm vs. 40–80 mm), and longer seeds (9.2–9.5 mm vs. 6.0–8.0 mm). It is distinguished from V. harmandii by having shorter petioles (3–8 mm vs. 10–20 mm), smaller leaves (9–42 × 4–18 mm vs. 45–75 × 25–45 mm), glabrous adaxial leaf surfaces, and larger corolla (7.2–9.6 mm diam. vs. 4–5 mm). From V. tengii, it differs by its larger corolla (7.2–9.6 mm diam. vs. 5–7 mm) and differently colored corolla, as well as the broadly elliptic rather than globose pollinia.

 Thi Thanh Huong Nguyen, Ngoc Han Le, Duc Binh Tran, The Bach Tran and Thu Ha Bui. 2026. Vincetoxicum phucanhense (Apocynaceae, Asclepiadoideae), A New Species from Vietnam. PhytoKeys. 279: 27-34. DOI: doi.org/10.3897/phytokeys.279.203612 [04 Sep 2026]

[Botany • 2020] Memecylon nervosum (Melastomataceae) • A New Species from South INDIA

Memecylon nervosum Vadhyar, J.H.F.Benj. & Sujana, 

in Vadhyar, Benjamin et Sujana, 2020. 

DOI: doi.org/10.1017/S0960428620000050

 Researchgate.net/publication/340951524

Abstract
Memecylon nervosum Vadhyar, J.H.F.Benj. & Sujana, a new species of Melastomataceae from the Kanyakumari Wildlife Sanctuary, Western Ghats, India, is described and illustrated. It is compared with the closely allied Memecylon heyneanum Benth. and Memecylon jambosioides Wight.

Keywords: India, Kanyakumari Wildlife Sanctuary, Melastomataceae, Memecylon nervosum

Memecylon nervosum Vadhyar, J.H.F.Benj. & Sujana, sp. nov.
A, Plants in their naturalhabitat; B, leaf (adaxial view); C, leaf (abaxial view); D, inflorescence; E, flowers; F–J, fruit atdifferent stages of development. 

Memecylon nervosum Vadhyar, J.H.F.Benj. & Sujana, sp. nov.

Etymology. The specific epithet alludes to the presence of prominently raised lateral andintramarginal veins on the lower surface of the lamina.

 R. G. Vadhyar, J. H. F. Benjamin and K. A. Sujana. 2020. MEMECYLON NERVOSUM (MELASTOMATACEAE), A New Species from South INDIA. Edinburgh Journal of Botany. 77(3); DOI: doi.org/10.1017/S0960428620000050 [27 April 2020]

 Researchgate.net/publication/340951524_MEMECYLON_NERVOSUM_A_NEW_SPECIES_from_SOUTH_INDIA

[Botany • 2026] Mitreola luongii (Loganiaceae) • A New Species from Limestone Hill in northern Vietnam

Mitreola luongii  Moriwak., Tagane & V.S.Dang,

in Moriwak, Tagane, Pham, Souladeth, Vongthavone, Kongxaisavath, Phonepaseuth, Naito, Yamazaki, Lenh et Dang, 2026. 

Tiểu mạo Vương Đình Lương  ||  DOI: doi.org/10.11646/phytotaxa.776.2.3 

Abstract

A new species of Mitreola (Loganiaceae), M. luongii, is described from limestone area in Tuyen Quang Province, northern Vietnam. Morphologically, it is most similar to M. crystallina, but can be distinguished by its shrub habit, up to 1 m tall (vs. herb, up to 60 cm tall), having terminal and axillary inflorescences (vs. terminal), shorter internode 1.5–5.5 cm long (vs. 6–8 cm long), shorter peduncles 0.5–1.5 cm long (vs. ca. 6 cm long), smaller leaf size 5.5–10.5 × 2–4.5 cm (vs. 15–20 × 5–7 cm) and longer corolla tube 4–4.5 mm long (vs. 4 mm long).

Eudicots, Du Gia National Park, Flora, Gentianales, hornpods, Indochina, taxonomy

Mitreola luongii.
 A. Habit, B–C. Flowering branches, D. Abaxial leaf surface, E. Terminal and axillary inflorescences, F. Corolla, front view, G. Corolla, lateral view, H. Partly dissected flower, showing stamens, style and stigma. I. Opened corolla, showing inner hairs and stamens, J. Pistil.

Photos: A by Quoc Trong Pham, B & E by Phetlasy Souladeth, C, D, F–J by Shuichiro Tagane.

Mitreola luongii Moriwak., Tagane & V.S.Dang, sp. nov.  

Diagnosis:—Mitreola luongii is most similar to M. crystallina of China in having light-purple corollas, but can be readily distinguished by its shrub habit, up to 1 m tall (vs. herb, up to 60 cm tall), terminal and axillary inflorescences (vs. terminal), shorter internode 1.5–5.5 cm long (vs. 6–8 cm long), shorter peduncles 0.5–1.5 cm long (vs. ca. 6 cm long), smaller leaf size 5.5–10.5 × 2–4.5 cm (vs. 15–20 × 5–7 cm) and longer corolla tube 4–4.5 mm long (vs. 4 mm long). (Table 1). 

...

Etymology:—The species epithet honors Mr. Vuong Dinh Luong, director of Du Gia National Park, who has made significant contributions to biodiversity conservation in the park. 

Vernacular name:—Tiểu mạo Vương Đình Lương

Hiroki MORIWAKI, Shuichiro TAGANE, Quoc-Trong PHAM, Phetlasy SOULADETH, Thyraphon VONGTHAVONE, Deuanta KONGXAISAVATH, Phongphayboun PHONEPASEUTH, Hanaka NAITO, Kaito YAMAZAKI, Thanh Thuong LENH and Van-Son DANG. 2026. Mitreola luongii (Loganiaceae), A New Species from Limestone Hill in northern Vietnam. Phytotaxa. 776(2); 166-172. DOI: doi.org/10.11646/phytotaxa.776.2.3 [2026-09-24]

[Botany • 2026] Neea myrciifolia (Nyctaginaceae: Pisonieae) • A New Species discovered in central Peru

 

Neea myrciifolia  D.S.Costa & Farroñay,

in Costa, Farroñay, Rossetto, Gonzáles et Giacomin, 2026. 

DOI: doi.org/10.1007/s12225-025-10369-7

Summary

Neea myrciifolia D.S.Costa & Farroñay (Nyctaginaceae, Pisonieae) a new species found exclusively in central Peru, in montane forest remnants, is here described, more than 90 years after the last Neea species was described for the country. Images of the morphological structures, a distribution map and a provisional conservation status of the new species, as well as taxonomic notes on morphologically similar species, are provided.

Key Words: endemism, Neotropical flora, Pisonieae, Reserva Comunal Yanesha, taxonomy

Neea myrciifolia.
A – B branches with pistillate flowers and fruits; C – D pistillate inflorescence.
A, C from R. Rojas 5731; B, D from R. Vásquez 36005.

photos by: Rocío del Pilar Rojas Gonzáles & Rodolfo Vásquez.

Neea myrciifolia D.S.Costa & Farroñay, sp. nov. 

Recognition. Neea myrciifolia can be easily distinguished from all other species in the genus by a unique combination of vegetative and reproductive characters: opposite leaves with abaxial surface with a verrucose texture covered with sparse, pubescent to tomentose, reddish trichomes, globose 2-branched inflorescences with tubular staminate and pistillate flowers and patent, open, deltoid perianth lobes.

Etymology. The specific epithet "myrciifolia" refers to the vegetative resemblance, e.g. opposite leaves and brochidodromus venation, to the genus Myrcia DC. (Myrtaceae).

Daniel da Silva Costa, Francisco Farroñay, Elson Felipe Sandoli Rossetto, Rocío del Pilar Rojas Gonzáles and Leandro L. Giacomin. 2026. Discovering Neea myrciifolia: the first New Species of Neea from Peru in over 90 years.  Kew Bulletin. DOI: doi.org/10.1007/s12225-025-10369-7 [03 August 2026]

x.com/manuelujan/status/2088201291327488285

[Botany • 2026] Leucheria melorum (Asteraceae: Nassauvieae) • A New Species from the Patagonian Andes

 

Leucheria melorum Horton & Picca, 

in Horton & Picca, 2026.

DOI: doi.org/10.11646/phytotaxa.774.3.4 

 

Abstract

A new species of Leucheria endemic to the Patagonian Andes in northern Neuquén, Argentina, is reported. Leucheria melorum is characterized by its cushion-like growth habit composed of dense woolly rosettes, rhizomes covered by persistent old leaves, and capitula with white to pink flower corollas. The species inhabits high-elevation volcanic environments (2550–2900 m a.s.l.) on the Domuyo and the Wayle massifs. We provide a detailed morphological description, illustrations highlighting the diagnostic morphological traits and a key for distinguishing L. melorum from related species. Based on the IUCN criteria and categories, a preliminary conservation status assessment is also given.

 Eudicots, Flora Altoandina, Leucheria, Nassauvieae, Patagonia

A. General view of the habitat of Leucheria melorum on Cerro Wayle at 2900 m a.s.l. with the Volcán Tromen in the background; B. Several dense rosettes; C. Rosette with capitula at different developmental stages; D. Close-up view of some flowering capitula; E. Fruit; F. Photomicrograph of the cypsela surface showing characteristic twin trichomes (indicated by white arrows) and biseriate glandular trichomes (indicated by black arrows).

Photos A, C, E & F: Pablo Picca; B & D: J. Felipe Horton.

Leucheria melorum.
A. Habit; B. Leaf, adaxial view; C. Scape and capitulum; D. Inner phyllary, dorsal view; E. Outer phyllary, dorsal view; F. Bract-like phyllary, dorsal view; G. Flower; H. Flower (ovary and pappus removed); I. Stamens; J. Fruit.

Line drawings by Angélica Marino.

Leucheria melorum Horton & Picca, sp. nov. 

Diagnosis:—Leucheria melorum is morphologically similar to L. candidissima and L. millefolium, which are also present in the northern Neuquén volcanic massifs. However, the new species is readily distinguished by its compact, cushion-like growth habit. It further differs from both by having very short stems (vs. more or less elongated in L. candidissima and L. millefolium), flabelliform leaf blades (vs. lanceolate in L. candidissima and elliptic in L. millefolium) and by having bi- or tri-pinnatisect leaves with oblong segments closely approximated towards the apex (vs. pinnatisect with an elongate terminal lobe in L. candidissima and bi- or tri-pinnatisect with rhomboidal segments in L. millefolium; segments regularly distributed along the rachis in both species).

Etymology:—The specific epithet honors Mabel and Sergio MELO, a couple of dedicated naturalists, who were the first people to collect specimens of this new species. Their keen observations of the high Andean flora and kind cooperation were very important to the recognition of this novelty.

Juan Felipe HORTON and Pablo I. PICCA. 2026. A New Species of Leucheria (Nassauvieae, Asteraceae) from the Patagonian Andes.  Phytotaxa. 774(3); 241-251. DOI: doi.org/10.11646/phytotaxa.774.3.4 [2026-09-17]

[Botany • 2026] Sedum guniuensis (Crassulaceae) • A New Species from Anhui, China

 

Sedum guniuensis Kun Liu, H. J. Ma & J.W. Shao, 

in Wang, Ma, Fang, Ding, Ni, Zhang, Zou, Shao, Li, Liu et Ai, 2026. 

牯牛景天  |  DOI: doi.org/10.1002/ece3.74120

 

ABSTRACT

A new species of Sedum (Crassulaceae), Sedum guniuensis from the Guniujiang Mountains in southern Anhui, China, is described and illustrated. This new species is similar to S. emarginatum, but can be clearly distinguished by its creeping growth habit and smaller cordate leaves. Additionally, complete chloroplast genomes from six populations of S. guniuensis provide strong molecular evidence for its taxonomic separation from S. emarginatum.

Sedum guniuensis Kun Liu, H. J. Ma & J.W. Shao, sp. nov.
 (A) habitat, (B) habit winter, (C) habit spring, (D) flowers, (E) plants.

 All are photographed by Kun Liu or Haijun Ma.

Sedum guniuensis Kun Liu, H. J. Ma & J.W. Shao, sp. nov. (Figures 4, 5).

Diagnosis: Sedum guniuensis (Figures 4 and 5) is morphologically similar to S. emarginatum, but differs in prostrate stems, cordate smaller leaves (0.5–1.2 × 0.4–1.0 cm vs. 1–2.5 × 0.5–1.2 cm), linear-obovate sepals (2–5 × 0.7–2 mm), and diminutive petals (6–8 × 1.5–2 mm) (Table 2). In sympatry (Figure 4A,B), S. guniuensis has creeping stems and smaller leaves than S. emarginatum.

Etymology: The epithet “guniuensis” is derived from the type locality, Guniujiang mountains, Shitai County, Anhui Province, China. 

The Chinese name given is “Gǔ Niú Jǐng Tiān” (牯牛景天).

Sedum guniuensis (B, D, E, G, I, K) and S. emarginatum (A, C, F, H, J, L),
(A, B) comparison of both species co-occurring in sympatric communities in the wild, (C, D) plants, (E, F) cauline leaves, (G, H) leaf, (I, J) flowers, (K, L) fruits.

All are photographed by Kun Liu or Haijun Ma.

 

Wan-Zeng Wang, Hai-Jun Ma, Hong-Ming Fang, Bai-Lin Ding, Wei-Yong Ni, Si-Yu Zhang, Shi-Hui Zou, Jian-Wen Shao, Nai-Wei Li, Kun Liu and Li-Jiao Ai. 2026. Sedum guniuensis, A New Species of Sedum (Crassulaceae) from Anhui, China. Ecology and Evolution. DOI: doi.org/10.1002/ece3.74120 [29 July 2026]