[Botany • 2026] Bryobium scutatum (Orchidaceae) • A New Species of Bryobium from Sumatra, Indonesia [Flora of Gayo Plateau IV]

 

Bryobium scutatum  Mustaqim, J.Champion & Schuit.,

in Schuiteman, Mustaqim et Champion, 2026.

DOI: doi.org/10.15517/hae3ah55 

  facebook.com: Jeffrey Champion 

Abstract

A new species of Bryobium Lindl. is described based on specimens collected in northern Gayo Plateau, Sumatra. It is provisionally assessed as Critically Endangered (CR) due to its narrow range and imminent threats to its habitat. A detailed description, photographs, an illustration, and a key to Sumatran Bryobium species are provided. 

Keywords: epiphyte, key, Red List, taxonomy, Indonesia

 Morphology of Bryobium scutatum.
 A. Sterile stem. B. Plant in flower. C. Inflorescence. D. Flowers. E. Flower, front view. F. Flower, lateral view. G. Dorsal sepals, abaxial and adaxial views. H. Lateral sepals, abaxial and adaxial views. I. Petals, adaxial and abaxial views. J. Column and lip, lateral view. K. Lip, adaxial view. L. Lip, adaxial view. M. Lip, lateral view. N. Lip, front view. O. Column and column-foot, ventral view. P. Anther cap, ventral views without and with the pollinarium. Q. Pollinia.

Photographs after Mustaqim et al. 4045 by Wendy A. Mustaqim (A-L and O-P) and after cult. J. Champion s.n. by Jeffrey Champion (M-N).

Bryobium scutatum Mustaqim, J.Champion & Schuit., sp. nov. 

Diagnosis: The new species is superficially similarto B. pullum from Sulawesi but differs in havinglarger floral parts (e.g., sepals 9.5–10.0 vs. 6 mm),a lip mid-lobe (epichile) with a central callus andtwo calli at the base (vs. mid-lobe without calli), lipnot constricted (vs. lip abruptly constricted near themiddle), basal calli of the lip shield-like ( vs. basalcalli ridge-like). The base of the lip is dark reddish ...

Etymology: From the Latin scutatus, ‘carrying ashield’, referring to the shield-like calli on the lip.

André Schuiteman, Wendy A. Mustaqim and Jeffrey Champion. 2026. Flora of Gayo Plateau IV: A New Species of Bryobium (Orchidaceae) from Gayo Plateau, Sumatra. LANKESTERIANA. 26(2); 93–100. DOI: doi.org/10.15517/hae3ah55 

  facebook.com/JeffreyChampion5/posts/27836172582738337

 Researchgate.net/publication/408315562_A_new_species_of_Bryobium_from_Gayo_Plateau_Sumatra

  

[Botany • 2025] Impatiens bungerara (Balsaminaceae) • A New Species with flame-coloured flowers from Sumatra, Indonesia [Flora of Gayo Plateau I]

Impatiens bungerara Mustaqim

in Mustaqim, 2025.

openjournals.library.sydney.edu.au/TEL 

facebook.com/botanywam

Abstract

Impatiens bungerara Mustaqim (Balsaminaceae) is described here as a new endemic species from the northern Gayo Plateau, Sumatra, Indonesia. The new species is similar to I. vitellina Grey-Wilson but differs by branched stems, hairs in leaves and peduncles, and several flower morphologies. A detailed description, discussion, and colour photographs are given.

Keywords: herbs, montane plants, taxonomy, West Malesia, Impatiens, Balsaminaceae

Impatiens bungerara Mustaqim sp. nov.

Wendy Achmmad Mustaqim. 2025. Flora of Gayo Plateau I: A New Impatiens (Balsaminaceae) Species with flame-coloured flowers from Sumatra, Indonesia.  Telopea. 29; 173–176. DOI: 10.7751/telopea21366

https://openjournals.library.sydney.edu.au/TEL/article/view/20712

 facebook.com/botanywam/posts/1212990170649810

 Researchgate.net/publication/392363916_A_new_Impatiens_species_from_Sumatra_Indonesia

Abstrak: Impatiens bungerara Mustaqim (Balsaminaceae) dipertelakan di dalam tulisan ini sebagai spesies tumbuhan endemik Dataran Tinggi Gayo bagian utara, Sumatra, Indonesia. Spesies baru ini serupa dengan I. vitellina Grey-Wilson, tetapi berbeda karena batang yang bercabang, rambut pada daun dan tangkai perbungaan, dan beberapa morfologi bunga. Sebuah pertelaan rinci, diskusi, dan foto-foto berwarna disajikan.

Kata kunci, herba, Malesia Barat, taksonomi, tumbuhan pegunungan 

[Botany • 2022] Vaccinium sulawesiense (Ericaceae: Vaccinieae) • Vaccinium in Sulawesi: A New Species and A List of known Taxa

 

Vaccinium sulawesiense Mustaqim & P.W.Fritsch, 

in Mustaqim, Fritsch, Ahmad, Lakiu, Pitopang et Ardi, 2022.

DOI: 10.7751/telopea15774 

Researchgate.net/publication/363672464

Abstract

Vaccinium sulawesiense Mustaqim & P.W.Fritsch, a newly discovered endemic to Sulawesi, Indonesia, is described. This species is similar to V. simulans Sleumer but differs in having an acuminate leaf apex, larger floral organs, and an absence of trichomes in the upper half of the inner surface of corolla and disk. This species is known from the two specimens, one from a mid-montane rain forest in Mamasa Regency, Sulawesi Barat Province and the another from Poso Regency, Sulawesi Tengah Province. An updated list of the 17 known Vaccinium species in Sulawesi is also provided.

Keywords: endemic, Ericales, shrub, Sulawesi, taxonomy

Morphology of Vaccinium sulawesiense Mustaqim & P.W.Fritsch:
A. Living plant. B. Branchlets with leaves and inflorescences. C. Inflorescence. D. Flowers.

 Scale bar: B–D = 10 mm. 

Photographs: A–C by Wendy A. Mustaqim, All images from W.H. Ardi et al. 583.

  

Wendy A. Mustaqim, Peter W Fritsch, Roland P.P. Ahmad, Fedrik S. Lakiu, Ramadanil Pitopang and Wisnu H. Ardi. 2022. Vaccinium (Ericaceae) in Sulawesi: A New Species and A List of known Taxa. Telopea. 25; 301–307. DOI: 10.7751/telopea15774 

Researchgate.net/publication/363672464_Vaccinium_Ericaceae_in_Sulawesi

[Botany • 2026] Homalomena bungamerah (Araceae: Philodendreae) • A New Species from Northern Sumatra, Indonesia

 Homalomena bungamerah Mustaqim, A.S.D.Irsyam & M.R.Hariri,

in Mustaqim, Irsyam, Pratama, Surbakti et Hariri. 2026. 

taiwania.ntu.edu.tw/abstract/2160 

Abstract

A new litophytic species of Homalomena from Sumatra, Homalomena bungamerah, is described. The new species is unique in having a plicate verrucose upper leaf surface combined with the absence of interpistillar staminodes. Owing to the ongoing threats and small population, H. bungamerah is provisionally assessed as Critically Endangered (CR B2 ab(iii,v)). Morphological descriptions, photographs, and notes are given.

Keyword: aroids, Homalomena asperifolia, Homalomena mobula, Homalomena scutata, herbs, litophyte, west Malesia

Morphology of Homalomena bungamerah Mustaqim, A.S.D.Irsyam & M.R.Hariri, sp. nov.
 A. Living plant. B. Leaf, adaxial. C. Leaf, abaxial. D. Leaf, adaxial texture. E. Leaf, close up of abaxial. F. Close-up of petiole ribs. G. Synflorescence showing spathe which is nodding at anthesis. H. Synflorescence. I. Inflorescence, front view. J. Inflorescence, lateral view. K. Spadix with spathe removed. L. Female spadix zone. M. Male spadix zone.

Photographs by Wendy A. Mustaqim.

Homalomena bungamerah Mustaqim, A.S.D.Irsyam & M.R.Hariri, sp. nov. 

 Diagnosis: This species is unique in having large and plicate leaves, a spathe that nodding at anthesis, and pistillate flowers without an interpistillar staminode. The most morphologically similar species is H. mobula P.C.Boyce 1/2), the larger leaf lamina (16.5–25.8 × 7.7–14.6 cm vs. 7.5–12 × 2.5–6 cm), and the absence of interpistillar staminodes. 

 

Etymology: The specific epithet “bunga merah” is derived from the Malay language, reflecting the inflorescence (“bunga”) with red (“merah”) peduncle and spathe. Malay is the indigenous language in Langkat Regency, where the type material was collected.  

Wendy A. Mustaqim, Arifin S.D. Irsyam, Muhammad A. Pratama, Irwansyah Surbakti and Muhammad R. Hariri. 2026. Homalomena bungamerah (Araceae), A New Species from Northern Sumatra, Indonesia. Taiwania. 71(2); 209-212 DOI: 10.6165/tai.2026.71.209 [16 March 2026]

https://taiwania.ntu.edu.tw/abstract/2160

[Botany • 2025] Gastrodia biruensis (Orchidaceae: Epidendroideae) • A New Species from East Java, Indonesia

Gastrodia biruensis Dwitara, Fatih, Yudistira & Mustaqim,

in Dwitara, Fatih, Yudistira et Mustaqim, 2025. 

openjournals.library.sydney.edu.au/TEL

Abstract

Gastrodia biruensis Dwitara, Fatih, Yudistira & Mustaqim, a new mycoheterotrophic orchid species from the eastern part of Java, Indonesia, is described and illustrated. It is similar to two other Javan endemics G. crispa J.J.Sm. and G. selabintanensis Tsukaya & A.Hidayat, but differs in several morphological details, as well as flower colour. Information on its distribution and ecology, photographs and illustrations are provided.

Keywords: biodiversity, herbs, orchids, conservation, taxonomy, mycoheterotrophic orchids, terrestrial

Morphology of Gastrodia biruensis.
A. Plant habit, B. Rhizome, C. Scale, D. Flower frontal view, E. Dorsal view, F. Flower lateral dissection, G. Sepals and petal adaxial view, H. Sepals and petal abaxial view, I. Pedicel, ovary, column and labellum lateral view, J. Column with ovary, K. Column stelidia, L. Column dorsal view, M. Labellum adaxial surface, N. Labellum abaxial surface, O. Anther-cap, abaxial and adaxial view, P. Pollinarium, Q. Floral bract, adaxial (ad) and abaxial view (ab).

All from type material. Photograph by Fariq I. A. Shidiq and design by Yuda R. Yudistira.

Gastrodia biruensis Dwitara, Fatih, Yudistira & Mustaqim, sp. nov.

Diagnosis: Gastrodia biruensis is similar to G. crispa J.J.Sm., but differs in having larger flowers (3.2–3.8 × 1.2–1.7 cm vs 1.8–2 × 0.9–1.3 cm), smooth (vs warty) outer sepal surface, petals white with an orange center extending to the apex (vs pure white), a larger labellum (11–13 × 7–10 mm vs 7–7.6 × 6–7 mm), labellum whitish-orange in the basal half and orange in the upper half, with two orange calli (vs white suffused pale yellowish green near apex), apex of labellum obtuse (vs acute), a longer column (10 mm vs 6.5–7 mm), orange (vs white) column margin, and orange (vs white) stelidia. Gastrodia biruensis is also similar to G. selabintanensis Tsukaya & A.Hidayat but differs in having larger flowers (3.2–3.8 × 1.2–1.7 cm vs c. 1.7 × 0.9 cm), labellum much longer than the column by c. 1.6 times (vs 1.1–1.3), yellowish basal calli (vs pure white), labellum orange in the upper half distal calli (vs yellowish white), orange (vs white) column margin, and orange (vs white) stelidia. (Table 1) 

Galuh A.C. Dwitara, Muhammad Al Fatih, Yuda R. Yudistira, Wendy Achmmad Mustaqim. 2025. A New Species of Gastrodia (Orchidaceae: Epidendroideae) from East Java, Indonesia. Telopea. 29; 285–291.

 openjournals.library.sydney.edu.au/TEL/article/view/21366

[Botany • 2025] Corybas gayoensis (Orchidaceae) • A New narrow endemic Orchid from Sumatra, Indonesia [Flora of Gayo Plateau II]

Corybas gayoensis  

in Mustaqim, Arico, Silviana, Afriyani, Yudistira et Victoriano, 2025.

DOI: doi.org/10.11646/phytotaxa.726.1.5  

 facebook.com/botanywam

 

Abstract

A new species, Corybas gayoensis is described here as endemic to the northern part of Sumatra. The new species is similar to Corybas pictus, but differs in having acuminate dorsal sepals with dentate upper margin, labellum with light red and concave central part, and a long fimbriate margin. The species is assessed as Critically Endangered due to its narrow distribution, continuous decline of population and habitat degradation. Detailed descriptions, illustrations, photographs, and discussion are given.

geophyte, montane plant, taxonomy, western Malesia, flora of Indonesia, Monocots

Wendy A. MUSTAQIM, Zulfan ARICO, Adinda SILVIANA, Linda AFRIYANI, Yuda R. YUDISTIRA and Malcolm VICTORIANO. 2025. Flora of Gayo Plateau II: Corybas gayoensis (Orchidaceae), A New narrow endemic Orchid from Sumatra.  Phytotaxa. 726(1); 53-58. DOI: doi.org/10.11646/phytotaxa.726.1.5 [2025-10-29]  

 facebook.com/botanywam/posts/1210043520944475

[Botany • 2025] Begonia elegantifolia (Begoniaceae, sect. Platycentrum) • A New Species from northern Sumatra, Indonesia

 Begonia elegantifolia Ritonga, Girm. & Mustaqim.

in Ritonga, Girmansyah et Mustaqim, 2025. 

DOI: doi.org/10.11646/phytotaxa.720.1.9   

instagram.com/floraindonesia_id 

 

Abstract

A new species of Begonia is described from lowland northern Sumatra, Indonesia named Begonia elegantifolia Ritonga, Girm. & Mustaqim. The species belongs to section Platycentrum and is unique from other species in having a combination of narrowly lanceolate leaves and flowers with six tepals. The new species is the first species in sect. Platycentrum that posseses staminate flowers with six tepals. Detailed description, diagnoses and photographs are given.

Cucurbitales, herb, lowland, Malesia, taxonomy, Eudicots

Begonia elegantifolia Ritonga, Girm. & Mustaqim sp. nov.

 

Yusran E. RITONGA, Deden GIRMANSYAH and Wendy A. MUSTAQIM. 2025. Begonia elegantifolia (Begoniaceae), A New Species from northern Sumatra, Indonesia.  Phytotaxa. 720(1); 87-92. DOI: doi.org/10.11646/phytotaxa.720.1.9 [2025-09-26]

instagram.com/p/DPD8m3dk6hc/floraindonesia_id

[Botany • 2025] Rigiolepis bungeputih (Ericaceae: Vaccinieae) • A New Species from northern Gayo Plateau, Sumatra, Indonesia

Rigiolepis bungeputih Mustaqim & M.N.Tamayo, 

in Mustaqim, Tamayo, Arico et Fritsch, 2025.

  https://openjournals.library.sydney.edu.au/TEL 

 Researchgate.net/publication/391492519

Photos: Wendy A. Mustaqim.

Abstract

Rigiolepis bungeputih Mustaqim & M.N.Tamayo, a close relative of blueberries (Vaccinium L.) and endemic to the tropical evergreen mossy rainforest of northern Gayo Plateau, Sumatra, Indonesia, is here described. It closely resembles R. gayoensis Mustaqim, M.N.Tamayo & P.W.Fritsch, but differs by having a glabrous stem, larger leaves, glabrous pedicels, white corollas, and larger stamens. Photographs, an illustration, and a detailed morphological description are included. Rigiolepis bungeputih represents the second endemic Rigiolepis Hook.f. species known from the island of Sumatra. This discovery raises the number of Rigiolepis species found in this island to four. A discussion on the ovary character of Rigiolepis in view of ongoing molecular studies is presented.

Keywords: blueberry, Malesia, taxonomy, tropical rainforest, Rigiolepis, Vaccinium

Rigiolepis bungeputih.
A. Habitat and epiphytic habit (plant indicated by a blue arrow). B. Branchlet showing leaf adaxial surface. C, D. Branchlet showing leaf abaxial surface and inflorescence. E. Inflorescence, lateral view. F. Flower, anterior view. G. Immature infructescence. H. One mature (left) and two immature (right) fruits. I. Cross section of fruit showing a pseudo-10-locular ovary.

Photos: Wendy A. Mustaqim.

 Illustration of Rigiolepis bungeputih based on the type material (W.A. Mustaqim 2719).
A. Flowering branchlet. B. Leaf (adaxial view). C. Leaf (abaxial view). D. Lateral view of inflorescence. E. Flower (lateral view). F. Flower (anterior view). G. Stamen (ventral view). H. Stamen (dorsal view). I. Fruit cross section showing a pseudo-10-locular ovary.

Illustration by Maverick N. Tamayo.

Rigiolepis bungeputih Mustaqim & M.N.Tamayo, sp. nov.

Type: INDONESIA: Sumatra Island, Aceh Province, AcehTengah Regency, Jagong Jeget Subdistrict, ..., 2310 m elevation, 15 June 2023,W.A. Mustaqim 2719 (holotype: LGS; isotype: UIDEP).

Diagnosis: Rigiolepis bungeputih closely resembles R. gayoensis but differs by having a glabrous stem (vs pubescent),larger leaves (60–72 × 35–40 vs 46–55 × 22–25 mm), glabrouspedicels (vs pubescent on 1/2 to 3/5 of pedicel length), whitecorollas (vs red), and larger stamens (1.8–2.1 vs 1.5–1.7 mm) 

Etymology: The epithet “bungeputih” is derived from the Gayonese words “bunge” (flowers) and “putih” (white), in reference to the white corolla of the species.

Wendy A. Mustaqim, Maverick Narceda Tamayo, Zulfan C. Arico and Peter W. Fritsch. 2025. Rigiolepis bungeputih (Ericaceae: Vaccinieae), A New Species from northern Gayo Plateau, Sumatra, Indonesia.  Telopea. 29; 119–125. 
 https://openjournals.library.sydney.edu.au/TEL/article/view/20201

 facebook.com/61558740376893/posts/122182653074291345

 Researchgate.net/publication/391492519_Rigiolepis_bungeputih_a_new_species_from_northern_Gayo_Plateau_Sumatra_Indonesia

[Botany • 2025] Begonia bukitrayaensis & B. kalimantana (Begoniaceae, sect. Petermannia) • Two New Species from Bukit Baka Bukit Raya National Park, Kalimantan, Indonesia

 

Begonia kalimantana Randi & Ardi, 

in Randi, Mustaqim, Kadhafi, Nursub’i et Ardi, 2025. 

 DOI: doi.org/10.11646/phytotaxa.704.2.1

Abstract

Two new species of Begonia were discovered during an expedition to Mount Bukit Raya, the highest peak in Kalimantan, Indonesian Borneo. Full descriptions with colour plates and distribution map are provided.

Begonia bukitrayaensis, Begonia kalimantana, herbs, national park,plant taxonomy, west Malesia, Eudicots

Begonia bukitrayaensis Randi & Mustaqim, sp. nov. 

§. Petermannia 

 

Diagnosis:—Begonia bukitrayaensis is similar to Begonia chakensis S.Julia & C.Y.Ling (2015: 108) in its creeping habit and ovate, asymmetric leaves, but differs in having glabrous vegetative parts except for stiff red bristle-like trichomes between the veins on the adaxial leaf surface (vs. densely pilose stems, petioles, and abaxial veins in B. chakensis). The leaves of B. bukitrayaensis have red-dentate margins and a rounded to slightly cordate base (vs. minutely serrate margins and an acute or slightly cordate base). The stipules are falcate with recurved margins and a cuspidate apex (vs. broadly ovate, serrate, and acute). Male flowers bear fewer stamens (25–28 vs. 39–40).

Begonia kalimantana Randi & Ardi.
A. Plant habit in the wild; B–C. Adaxial and abaxial surface of leaves; D. Stipule; E. Stem and inflorescences; F. Staminate flower (top view); G–H. Pistillate flower (top and side view).

Photographs: A. Randi (all from Randi AR-1366).

Begonia kalimantana Randi & Ardi, sp. nov. 

§. iPetermannia  

Diagnosis:—Begonia kalimantana resembles Begonia eutricha Sands (1997: 434) in erect habit with distichous and falcate leaves, however it can be easily distinguished by striking consistent color pattern, dark olive green with shiny silvery white stripe along the midrib (vs. plain green), lamina surface hirtellous (vs. densely hispid); shorter male flower pedicels 8–12 mm long (vs. 22–24 mm long); ovary reddish and glabrous (vs. ovary white tinged with pink, and covered with soft white erect hairs), wings margin glabrous (vs. ciliate), and longer ovary beaked 3–5 mm long (vs. 1 mm long).

Agusti RANDI, Wendy A. MUSTAQIM, Andi M. KADHAFI, Firasadi NURSUB’I and Wisnu H. ARDI. 2025. Two New Species of Begonia (Begoniaceae) from Bukit Baka Bukit Raya National Park, Kalimantan, Indonesia.  Phytotaxa. 704(2); 99-105. DOI: doi.org/10.11646/phytotaxa.704.2.1 [2025-06-06]

[Botany • 2025] Bulbophyllum bukitrayaense (Orchidaceae: Epidendroideae) • A New Species of section Macrocaulia from Mount Bukit Raya, Indonesia [Contributions to the Orchid Flora of Kalimantan II]

Bulbophyllum bukitrayaense  Yudistira & Mustaqim,  

in Yudistira, RANDI, JOHARUDIN et Mustaqim, 2025. 

 DOI: doi.org/10.11646/phytotaxa.700.3.1 

 Researchgate.net/publication/391644817

 

Abstract

A new species of Bulbophyllum section Macrocaulia named Bulbophyllum bukitrayaense Yudistira & Mustaqim is described from the mid-montane forest zone of Mount Bukit Raya, Kalimantan Barat Province. It is similar to Bulbophyllum scabrum but differs in having the lower surface of the labellum with two times approaching margin undulation. The new species also have coarsely rugose upper ¼ surface of the labellum (vs smooth) and ovary covered by papillose-muriculate indumentum (vs glabrous). A full description, notes, and fresh photograph plates are given.

Bulbophyllum, endemic, epiphyte, taxonomy, West Malesia, Monocots

Bulbophyllum bukitrayaense (A) in its habitat alongside Bulbophyllum succedaneum J.J.Sm. (Smith 1927: 67).

Photographby Wendy A. Mustaqim.

 Bulbophyllum bukitrayaense Yudistira & Mustaqim sp. nov.

Yuda R. YUDISTIRA, Agusti RANDI, Didin JOHARUDIN and Wendy A. MUSTAQIM. 2025. Contributions to the Orchid Flora of Kalimantan II: A New Bulbophyllum sect. Macrocaulia from Mount Bukit Raya, Indonesia. Phytotaxa. 700(3); 251-256. DOI: doi.org/10.11646/phytotaxa.700.3.1 [2025-05-09] 

 Researchgate.net/publication/391644817_A_new_Bulbophyllum_from_Bukit_Raya_Kalimantan_Indonesia

[Botany • 2024] Bulbophyllum bonjolianum (Orchidaceae: Epidendroideae: Bulbophyllinae) • A New Species of section Macrocaulia from Sumatra, Indonesia

 Bulbophyllum bonjolianum Yudistira, Candra & Mustaqim, 

in Yudistira, Candra et Mustaqim, 2024. 

 facebook.com: Wendy Achmmad Mustaqim

 Researchgate.net/publication/387275550

Bulbophyllum bonjolianum Yudistira, Candra & Mustaqim, a member of section Macrocaulia, is described here based on a specimen collected from the mountains of West Sumatra. It is similar to B. tristriatum Carr. and B. pyridion J.J.Verm. but differs in the morphology of the dorsal sepal, petal and labellum. A key to B. bonjolianum and morphologically similar species is presented.

Keywords. Endemic, epiphyte, Malesia, orchids, taxonomy

 Bulbophyllum bonjolianum Yudistira, Candra & Mustaqim.
 A. Plant habit with inflorescence. B. Flower top view. C. Median sepal, abaxial view. D. Median sepal, adaxial view. E. Lateral sepal, abaxial view. F. Lateral sepal, adaxial view. G. Petal, abaxial view. H. Petal, adaxial view. I. Labellum, lateral view. J, K. Labellum, abaxial and adaxial surface. L. Column stelidium. M. Anther cap, adaxial view. N. Anther cap, abaxial view. O. Pollinarium.

Drawing by Yuanito Eliazar.

 Bulbophyllum bonjolianum Yudistira, Candra & Mustaqim.
A. Plant habit. B. Inflorescence. C, D. Flower, lateral view, with close-up view showing basal node of the pedicel. E. Flower, front view without median sepal. F. Flower, view from above. G. Median sepal, abaxial and adaxial views. H. Petal, abaxial and adaxial views. I. Lateral sepal, abaxial, adaxial and side views. J. Labellum, adaxial, abaxial and side views. K. Column with stelidia, side view. L. Column stelidia, front view.

 ab = abaxial, ad = adaxial, sv = side view. (Photos: Y.R. Yudistira)

Bulbophyllum bonjolianum Yudistira, Candra & Mustaqim, sp. nov.

Bulbophyllum bonjolianum is morphologically similar to B. tristriatum Carr. and B. pyridion J.J.Verm., but differs in the dorsal sepals abruptly tapering from the middle upwards (vs gradually narrowing), pentagonal petal (vs elliptic-(ob)-ovate in B. tristriatum and elliptic in B. pyridion), and longer labellum (6.8–7 mm vs 3.5–5 mm in B. tristriatum and c. 3.2 mm long in B. pyridion) with the proximal adaxial surface coarsely papillose (vs smooth). The species is also similar to the Peninsular Malaysian species B. hodgsonii M.R.Hend., but the new species differs in its dorsal sepals abruptly tapering from the middle upwards (vs gradually narrowing), lateral sepals with 3 veins (vs 5), and the coarsely papillose adaxial surface of the labellum in the lower proximal part (vs smooth).

Etymology. The species is named in honour of Tuanku Imam Bonjol, a national hero of Indonesia from West Sumatra Province.   

Yudistira, Y.R., Candra, R. and Mustaqim, W.A. 2024. A New Species of Bulbophyllum (Orchidaceae: Bulbophyllinae) section Macrocaulia from Sumatra, Indonesia. Gardens' Bulletin Singapore. 76(1); 251 - 258.

  facebook.com/botanywam/posts/1002208751727954

 Researchgate.net/publication/387275550_A_new_species_of_Bulbophyllum_section_Macrocaulia_from_Sumatra_Indonesia

 

[Botany • 2024] Impatiens bungeusing (Balsaminaceae) • A New species from the Northern Gayo Plateau, Sumatra, Indonesia

 

Impatiens bungeusing Mustaqim & Ruchis.,  

in Mustaqim, Arico, Jayanthi, Andini, Pratiwi et Ruchisansakun, 2024.   

 taiwania.ntu.edu.tw/abstract/2035 

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Abstract

Impatiens is a diverse genus within the Balsaminaceae family, comprising over 1,120 species. The northern Gayo Plateau of Sumatra, an island in Southeast Asia, is renowned for its rich Impatiens diversity. In this paper, we described and illustrated a new species named Impatiens bungeusing from this area. This species is most similar to Impatiens vitellina Grey-Wilson but differs in having the distinct abaxial leaf venation in a dry state (vs obscure), lateral sepals falcate-oblong (vs narrowly lanceolate), lower sepals with U-shaped spur (vs straight), broadly ovate dorsal petal (vs ovate), and ovate sub-rhomboidal upper lateral united petals (vs oblong). This discovery brings the total number of known Impatiens species in Sumatra to forty-eight.

Keyword: Ericales, herbs, Impatiens tapanuliensis, Impatiens vitellina, Malesia, limestone plant, taxonomy, Uniflorae

Morphology of Impatiens bungeusing Mustaqim & Ruchis., sp. nov.
 A. Plants in habitat. B. Living plant. C. Inflorescence. D. Flower. E. Lateral sepals. F. Dorsal petals. G. Lateral united petals. H. Lower sepal. I. Pedicel and ovary. J. Fruit.

Scale: A = 4 cm, B = 3 cm, C–D = 1 cm, E = 2 mm, F = 3 mm, G–J = 5 mm. Photographs by Wendy A. Mustaqim.

Morphology of Impatiens bungeusing Mustaqim & Ruchis., sp. nov.
  A. Plant. B. Leaves showing petiole. C. Leaves showing apex and margin. D. Inflorescence. E. Flower, frontal view. F. Flower, lateral view. G. Pedicel, lower sepal, stamens, and ovary. H. Lateral sepal. I. Dorsal petal. J. Lateral united petals.

Scale: A = 3 cm, B–D = 5 mm, E–G = 1 cm, H = 3 mm, I–J = 5 mm. 

Illustrated by Yuanito Eliazar.

Impatiens bungeusing Mustaqim & Ruchis., sp. nov. 

Type: Indonesia. Aceh Province: Aceh Tengah Regency, Jagong Jeget, ..., 2100 m asl, 11 January 2023, Mustaqim 2577 (holotype: LGS; isotype: MEDA). 

Diagnosis: Impatiens bungeusing is similar to Impatiens vitellina Grey-Wilson. However, it differs in having the distinct abaxial leaf venation in a dry state (vs obscure), flowers with lower sepal having U-shaped spur (vs straight), broadly ovate dorsal petal (vs ovate), and ovate sub-rhomboidal upper lateral united petals (vs oblong) (Table 1).

Etymology: The specific epithet "bungeusing" is derived from the Gayo language. "Bunge" means flower, and "using" means yellow, reflecting the plant's bright yellow flowers.

Wendy A. Mustaqim, Zulfan Arico, Sri Jayanthi, Wanda R. Andini, Devi Pratiwi and Saroj Ruchisansakun. 2024. Impatiens bungeusing (Balsaminaceae), A New species from the Northern Gayo Plateau, Sumatra, Indonesia. Taiwania. 69(4); 554-559. DOI: 10.6165/tai.2024.69.554  taiwania.ntu.edu.tw/abstract/2035

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[Botany • 2023] Schoenorchis kembangleutik (Orchidaceae: Aeridinae) • A New Species from West Java, Indonesia

  Schoenorchis kembangleutik Yudistira & Mustaqim, 

   

in Yudistira et Mustaqim, 2023.  

DOI: 10.3767/blumea.2023.68.01.07

 Researchgate.net/publication/371971124

 Photograph by Y.R. Yudistira. 

Abstract 

Schoenorchis kembangleutik Yudistira & Mustaqim described here as new to science is an orchid species currently considered endemic to West Java. It is similar to S. pachyachris (J.J.Sm.) J.J.Sm. from Sumatra and Java but differs in having flowers with midlobe of labellum orbicular (vs oblong) with horizontal and rounded (vs pointing upwards and tapering to a point) apex, the labellum side lobes white, uncinate and retrorse at the apex (vs yellow, straight and erect at apex), and in having shorter spurs with straight base (2 vs 4 mm long, with geniculate base). A morphological description, notes on distribution, habitat and ecology, an illustration, photographs and a key to the five species of Schoenorchis of Java are provided.

Keywords: Aeridinae; Malesia; Schoenorchis kembangleutik; Flora of Indonesia; taxonomy

  Schoenorchis kembangleutik Yudistira & Mustaqim.
 a. Plant; b. leaves; c. inflorescence; d. dorsal sepals; e. petals (one petal is broken); f. lateral sepals; g. labellum and column; h. anther-cap and pollinarium.

 Photographs by Y.R. Yudistira, 2022.

  Schoenorchis kembangleutik Yudistira & Mustaqim in its natural habitat.

 Photograph by Y.R. Yudistira, 2022.

Yuda Rehata Yudistira and Wendy A. Mustaqim. 2023. A New Species of Schoenorchis (Orchidaceae) from West Java, Indonesia. Blumea - Biodiversity, Evolution and Biogeography of Plants. DOI: 10.3767/blumea.2023.68.01.07 

Researchgate.net/publication/371971124_A_new_species_of_Schoenorchis_from_Indonesia