[Botany • 2017] Macrosolen brunsing • A New Hemiparasitic Shrub (Loranthaceae) from Brunei Darussalam [Novitates Bruneienses, 8]

Macrosolen brunsing  Y.W.Low & Ariffin

SBG.org.sg 

ABSTRACT

 Macrosolen brunsing Y.W.Low & Ariffin is described and illustrated here as a new species of aerial hemiparasite based on two collections from the Ladan Hills Forest Reserve, Tutong, Brunei Darussalam. The new species differs from all Macrosolen taxa enumerated in Borneo by its distinct linear leaves ((4–)8–14.5 cm long, 0.1–0.2(–0.25) cm wide). 

Keywords. Borneo, endemic, linear-leaved, Malesia, new species

Fig. 2. Macrosolen brunsing Y.W.Low & Ariffin.
A. Pendulous flowering branch showing distichous almost needle-like linear leaves and a terminal inflorescence. B. Close-up of mature flower buds that somewhat resemble bowling pins. C. Close-up of open flowers. D. Close-up of fruits. All from type Y.W. Low et al. LYW 1081. (Photos: Y.W. Low) 

Macrosolen brunsing Y.W.Low & Ariffin, sp. nov. 

Similar to Macrosolen brevitubus Barlow but differs in having narrow linear leaves ((4–)8–14.5 cm long, 0.1–0.2(–0.25) cm wide), and inflorescence a raceme of two opposite pairs of flowers.

– TYPE: Brunei, Tutong District, Rambai, Ladan Hills Forest Reserve, Nyamokning Dam, BRUN-SING botanical exploration campsite on the edge of forest near water body, lowland mixed dipterocarp forest on yellow sandy clay soils, 75 m asl, 22 August 2016, Y.W. Low, M.I. Siti Nur Bazilah, A.K. Muhd. Ariffin, A. Watu, E. Jangarun, P. Azlan, K. Muhd. Khairul Nizam & Z.A. Muhd. Wafiuddin LYW 1081 (holotype BRUN (including spirit material as part of a single specimen); isotypes E, K, L, SAN, SAR, SING [[SING0166300] & spirit material [SING0202921]). (Fig. 1, 2)

Etymology. The epithet brunsing is composed by merging two herbaria acronyms together, namely BRUN (the Brunei National Herbarium) and SING (Herbarium of the Singapore Botanic Gardens). This new species is named for the two herbaria to celebrate the close working relationship between the two herbaria that can be traced back to the early 80’s. The on-going MoU programme “The Botanical Survey of Brunei Darussalam” continues this cooperation.

 Y.W. Low, A.K. Muhammad Ariffin, A.A. Joffre and D. Duratul Ain. 2017. Novitates Bruneienses, 8. Macrosolen brunsing (Loranthaceae), A New Hemiparasitic Shrub from Brunei Darussalam. Gardens’ Bulletin Singapore. 69(1); 67–73.
https://www.sbg.org.sg/images/4_4_Research_Gardens_Bulletin/4_4_69_1_pdf_Vol_69_Part_1_2017/69_1_67_y2017_V69P1_GBS_pg67.pdf

   

[Botany • 2016] Hydnophytum puffii • A New Ant-plant (Rubiaceae: Psychotrieae) from Sabah, Malaysian Borneo

Hydnophytum puffii 

Y.W.Low, Sugau & K.M.Wong  

DOI: 10.5091/plecevo.2016.1102 

Abstract

Background – Hydnophytum puffii Y.W.Low, Sugau & K.M.Wong, a linear-leaved epiphytic ant-plant is described as new from Borneo using morphological characters based on specimens preserved in the Sandakan and Singapore Herbaria. This new species is so far known only from Sabah, Malaysia.

Methods – This study is based on herbarium materials and field observations in Sabah. Conventional herbarium techniques were applied for taxonomy, while the IUCN conservation status was assessed using GeoCAT.

Results – Hydnophytum puffii is closely related to H. angustifolium Merr. but differs in having glabrous young twigs, 4–5 pairs of leaf secondary veins on the lower leaf surface, a corolla tube that is densely covered with translucent hairs inside the throat around the anthers, and prolate mature fruits. This new taxon is the only species in Borneo to have linear leaves as the other two taxa, namely H. coriaceum Becc. and H. formicarum Jack have broad elliptic leaves.

Key words – Borneo, conservation status, Hydnophytum, Malaysia, new species, Psychotrieae, Rubiaceae, Sabah.

   Yee Wen Low, John B. Sugau and Khoon Meng Wong. 2016. Hydnophytum puffii (Rubiaceae: Psychotrieae), A New Ant-plant from Sabah, Malaysian Borneo. Plant Ecology and Evolution. 149(1):123-130. DOI: 10.5091/plecevo.2016.1102 

ResearchGate.net/publication/296476136_Hydnophytum_puffii_Rubiaceae_Psychotrieae_a_new_ant-plant_from_Sabah_Malaysian_Borneo

  

[Botany • 2013] Begonia jamilahana • A Remarkable New Species of Begonia sect. Petermannia (Begoniaceae) from Brunei Darussalam [Novitates Bruneienses, 2]

Fig. 1. Begonia jamilahana Y.W.Low, Joffre & Ariffin.

A. Habit. B. Close-up of upper leaf surface. C. Detail of stem showing red nodes. D. Close-up of male portion of inflorescence. E. Close-up of female flowers. F. Detail of styles showing twisted papillose stigmas. G. Cross section of an immature fruit. H. Immature fruit (side view). I. Detail of a stipule.

A & B from P. Azlan et al. BRUN 23373, C–J from ex-situ collection at BRUN. 

Photos: A & B, A.K. Muhammad Ariffin; C–J, Y.W. Low

ABSTRACT

Begonia jamilahana Y.W.Low, Joffre & Ariffin is described and illustrated here as a new species based on a collection from Ladan Hills Forest Reserve, Tutong, Brunei Darussalam. This new taxon is closely related to B. conniegeriae S.Julia & Kiew and B. papyraptera Sands, but differs in a suite of morphological characters. Begonia jamilahana is placed in Begonia section Petermannia, the largest of all the sections recognised.

Keywords. Begonia jamilahana, Begoniaceae, Borneo

Begonia jamilahana Y.W.Low, Joffre & Ariffin, sp. nov. (sect. Petermannia)

Similar to Begonia papyraptera Sands but differs in having a smooth and terete stem, leaf blade scantily covered with translucent hispid hairs on both sides, upper mature leaf surface dark green with red markings on vein axil nodes nearer to the base of the leaf, lower leaf surface pale green, and base of capsule wings cuneate. 

 TYPE: Brunei, Tutong District, Lamunin, Ladan Hills Forest Reserve, Compartment 1, 58 m, 4°42’16”N 114°44’12”E, lowland mixed dipterocarp forest on yellow sandy clay soils, steep slope, 15 Dec 2010, P. Azlan, A.K. Muhd. Ariffin, A. Watu & M. Rauzaidi BRUN 23373 (holotype BRUN (including spirit material); isotypes K, SING). (Fig. 1, 2)

Distribution and habitat. Begonia jamilahana is so far known only from the Ladan Hills Forest Reserve, where it was documented on steep earth banks and adjacent slopes in the mixed dipterocarp forest on yellow sandy clay soils.

Etymology. This species is named for Hajah Jamilah binti Haji Abdul Jalil, acting Deputy Director of the Brunei Forestry Department, upon her retirement in 2015, as a token of appreciation for her excellent service rendered to the Forestry Department, as well as her unwavering support for the Brunei-Singapore botanical exploration programme.

 Y.W. Low, A.A. Joffre and A.K. Muhammad Ariffin. 2013. Novitates Bruneienses, 2. A Remarkable New Species of Begonia sect. Petermannia (Begoniaceae) from Brunei Darussalam. Gardens’ Bulletin Singapore. 67(1): 61–68. DOI: 10.3850/S2382581215000071

researchgate.net/publication/278024027_Novitates_Bruneienses_2._A_remarkable_new_species_of_Begonia_sect._Petermannia_(Begoniaceae)_from_Brunei_Darussalam

https://www.sbg.org.sg/images/4_4_Research_Gardens_Bulletin/4_4_67_1_pdf_Vol_67_Part_1_2015/4_4_67_1_61_y2015_V67P1_GBS_pg61.pdf

[Botany • 2015] Hoya tamdaoensis • A New Species (Apocynaceae, Asclepiadoideae) from Vietnam

FIGURE. 1. Photographs of a living plant of Hoya tamdaoensis Rodda & T.B.Tran cultivated at the Singapore Botanic Gardens (M. Rodda MR729, SING) a. Inflorescence, adaxial view; b. Inflorescence, abaxial view; c. Branch, peduncle, and pendulous inflorescence

Photographs by M. Rodda. || Phytotaxa || DOI: 10.11646/phytotaxa.217.3.6

Abstract

A new species of Hoya R.Br. from Tam Đảo National Park (Vĩnh Phúc Province, Vietnam), Hoya tamdaoensis Rodda & T.B.Tran,is described and illustrated. It is distinguished from the morphologically similar Hoya siamica Craib by corolla size, lamina shape, coloration, and orientation of the petioles.

Keywords: Hoya siamica, limestone, lithophytic, lower montane forest, Marsdenieae, Eudicots, Vietnam

Hoya tamdaoensis Rodda & T.B.Tran spec. nov. (Figs. 1 & 2) Similar to Hoya siamica Craib (1910: 419) in exhibiting inflorescences positively geotropic, convex, flowers numerous, corollas white, pubescent within, and leaves glabrous, but distinguished by the corolla size (1.8–2.2 cm diam. vs. < 1 cm diam. in H. siamica) and the lamina shape (base attenuate-rounded and apex caudate vs. base cuneate or acute and apex acute or acuminate in H. siamica). 

TYPE:— VIETNAM, Vĩnh Phúc prov., Tam Đảo N.P., Máy Giấy trail, 1072 m, 20 September 2011, Nguyễn Quốc Bình, Jana Leong- Škorničková, Trần Hữu Đăng VNM-B1465 (holotype, SING!; isotypes HN!, VNMN!).

Etymology:— The new species is named after the collection locality, Tam Đảo National Park, Vietnam. 

Distribution and ecology:— Only known from the type locality in Tam Đảo National Park, Vietnam. Hoya tamdaoensis was found growing epilithically on limestone covered by moss in evergreen lower montane forest. 

Conservation status:— Known from only one locality; the preliminary conservation status of Hoya tamdaoensis is Data Deficient (DD; IUCN 2014).

Michele Rodda, The Bach Tran and Quoc Binh Nguyen. 2015. Hoya tamdaoensis (Apocynaceae, Asclepiadoideae), A New Species from Vietnam. Phytotaxa. 217(3): 288–292. DOI: 10.11646/phytotaxa.217.3.6

http://mapress.com/phytotaxa/content/2015/f/pt00217p292.pdf

[Botany • 2014] Hoya rintzii • Taxonomic Revision of the Hoya mindorensis complex (Apocynaceae: Asclepiadoideae)

Hoya rintzii 

Rodda, Simonsson & S. Rahayu (2014)

ABSTRACT 

The Hoya mindorensis complex is revised, types for the names involved are selected, and a new classification of the taxa is proposed. Hoya erythrostemma is separated once again from Hoya mindorensis, Hoya elmeri is identified as an earlier name for Hoya mindorensis subsp. superba, and a further new species, Hoya rintzii, from Peninsular Malaysia, Sumatra and Borneo, is described. A key is provided as an aid to identification.

Keywords: Borneo, Hoya elmeri, Hoya erythrostemma, Hoya mindorensis subsp. mendozae, Hoya mindorensis subsp. superba, Hoya rintzii, Indonesia, Malaysia

 Michele Rodda, Nadhanielle Simonsson Juhonewe and Sri Rahayu. 2014. Taxonomic Revision of the Hoya mindorensis complex (Apocynaceae: Asclepiadoideae). Webbia. 69(1). DOI: dx.doi.org/10.1080/00837792.2014.900261