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This species is accepted, and its native range is Borneo (E. Kalimantan).

[KBu]

Girmansyah D. 2017. Two new species of Begonia (Begoniaceae) from Long Duhung, Berau Regency, East Kalimantan, Borneo Island, Indonesia. Kew Bulletin 72:3. DOI 10.1007/S12225-016-9665-2

Type
Type: Indonesia, East Kalimantan, Berau Regency, Kelay Distr., Long Duhung Village, small hill about 100 m, western part of Long Duhung, 100 - 150 m alt., 8 May 2015, Deden Girmansyah Deden 2094 (holotype BO!).
Habit
Bushy, cane-like, glabrous begonia, usually branched at base from a prostrate rhizome
Stem
Stem reddish brown or purple, up to 1.25 m tall, c. 7.5 mm diam., becoming woody, flowering at 60 cm, internodes 4 - 9 cm long, erect, branching at c. 30 cm, nodes swollen and almost articulate; stipules pale green, triangular to lanceolate, 17 - 25 x 6 - 10 mm, margin entire, apex setose, ending with short appendix 3 mm long, persistent
Leaves
Leaves alternate, distant, positioned with the apex held upwards; petiole reddish brown or purple, 2.5 - 11 cm long, grooved above, sparse white hairs getting rather dense near base of lamina; lamina sometimes with a silvery hue when immature, glossy above, asymmetric, ovate, 18 - 23 x 7.5 - 11 cm, base cordate but not overlapping, margin serrulate, apex acuminate; venation palmate-pinnate, 3 pairs along mid­rib and 1 pair at base, 3 veins in basal lobe, pale green beneath
Inflorescences
Inflorescence axillary, protogynous, much branched cymes, brownish red, erect, 2.5 - 10 cm long, longer than petioles, with 1 or 3 female flowers proximally and many male flowers distally on thin branches; bracts ovate, pale green 10 x 5 mm, margin entire, apex acute, caducous
Flowers
Female flower arises from basal inflorescence, commonly with three flowers distant, pedicel 2.5 - 2.6 cm long, crimson, ovary glabrous, oblong, 22 - 25 x 15 - 20 mm, wings 3, isomorphic, locules 3, placentas axile, bilamellate, many ovules on both surfaces; tepals 5, pale reddish green with a peachy tinge, ovate to oblong, c. 7 – 8 x 2- 6 mm long, margin entire, apex acute; styles 3, c. 3 mm long including short column, divided at the end of torus, bifurcating, stigma pale yellow, papillose, forming a continuous twisted band Male flower with reddish pedicel 8 - 10 mm long; tepals 2, pinkish, c. 6 x 4 mm; stamens c. 55, cluster globose, c. 3 mm long without a short torus, filaments c. 1 mm long, anthers lemon yellow, obovate, c. 1 mm long, apex not emarginated
Fruits
Fruit dangling on a strongpedicel, 2.4-4 cmlong; capsule obovoid, 25 -30x 15 -20 mm, glabrous, locules3, dehiscingbetween locule and wing, wings isomorphic, rounded at base, 0.29 -0.37 mm wide, thinly fibrous
Seeds
Seeds barrel-shaped, obovoid to oblong, 0.29 - 0.37 mm long, collar cells more than half the seed length
Note
Similar to Begonia heliostrophe Kiew from Kinabantangan Distr., Sabah (Kiew2001: 262) in its branch direction (vertically not horizontally) and inflorescence origin (axillary not terminal), and also similar to B. dimorpha S. Julia, from Danum Valley, Sabah (Chong et al.2015a) in its lamina shape (ovate, not narrowly ovate), and number of male (2, not 4) tepals) and female tepals (5 not 6). B. duhungensis differs from both species in several characters. The epithet is derived from the name of village Long Duhung, a special village with responsi­bility for the protection of the surrounding forest.
Distribution
Known from type locality in East Kali­mantan, Berau Regency, Indonesia.
Ecology
Terrestrial herb, grows in substrates with thick litter, quite open areas up to closed canopy, along the trail and slope of the hill in tropical forest lower than 500 m asl.
Conservation
According to IUCN Red List criteria (IUCN2012), the conservation status of Begonia duhungensis must be considered Data Deficient (DD) because it is known only from the type locality. More extensive collections from the region are needed to confirm its distribution and the status of species. If more collecting efforts do not yield more localities there is every potential for another category, likely CR.

Native to:

Borneo

Begonia duhungensis Girm. appears in other Kew resources:

First published in Kew Bull. 72(1)-3: 2 (2016)

Literature

Kew Bulletin

  • Chong, F. Y., Guanih, V. S. & Rimi, R. (2015b). Begoniakibambanganensis and B. melanosticta (Begoniaceae), two New Species from Sabah, Borneo. Sandakania 20: 1 - 6.
  • Chong, F. Y., Guanih, V. S., Julia, S. & Kiew, R. (2015a). Begonia (Begoniaceae) in the Danum Valley Conservation Area, Sabah, Borneo, includ­ing Eleven New Species. Sandakania 20: 51 - 85.
  • Girmansyah, D. & Susanti, R. (2015). Two new species of Begonia from Borneo. Kew Bull. 70: DOI 10.1007/S12225-015-9569-6
  • Joffre, A. A., Kiew, R., Julia, S. & Rimi, R. (2015). The Begoniaceae of Brunei Darussalam, Borneo, including Two New Species. Sandakania 20: 7 - 50.
  • Julia, S. , Kiew, R. & Ling, C. Y. (2015a). A Decade of Begonia (Begoniaceae) from Sarawak, Borneo. Sandakania 20: 129 - 154.
  • Julia, S. , Kiew, R. & Ling, C. Y & Geri, C. (2015b). Begonia (Begoniaceae) from Kubah National Park and Environs, Sarawak, Borneo, including a New Spe­cies. Sandakania 20: 87 - 106.
  • Julia, S. & Ling C. Y. (2015). Eight New species of Begonia (Begoniaceae) from Murum Dam, Sarawak, Bor­neo. Sandakania 20: 107 - 128
  • Kiew, R. , Julia, S., Rimi, R. & Joffre, A. A. (2015). A Guide to Begonias of Borneo. Natural History Publication (Borneo). Kota Kinabalu.
  • Rimi, R., Karim, R. M. & Mujih, H. (2015b). Three New Begonia (Begoniaceae) Species from Ultramafic Outcrops in Kinabalu Park, Sabah, Malaysia. Sandakania 20: 155 - 164.
  • Rimi, R., Sampang, K. & Limbawang, S. (2015a). Begonia (Begoniaceae) from Tawau Hills Park, Sabah, Malaysia, including Ten New Species. Sandakania 20: 165 - 204.
  • Julia, S. & Kiew, R. (2014). Diversity of Begonia (Begoniaceae) in Borneo — How many species are there? Reinwardtia 14: 233 - 236.
  • Lin, C. W., Chung, S. W. & Peng, C. I. (2014a). Begonia baik and B. padawanensis spp. nov. (Begoniaceae) from sandstone area in Sarawak, Malaysia. Nordic J. Bot. doi:10.1111/njb.00641.
  • Lin, C. W., Chung, S. W. & Peng, C. I. (2014b). Three new species of Begonia (section Petermannia, Begoniaceae) From Sarawak, Borneo. Phytotaxa 191 (1): 129 - 140.
  • Lin, C. W., Chung, S. W. & Peng, C. I. (2014c). Begonia hoesensis (section Reichenheimia, Begoniaceae) a new species from Sarawak, Malaysia. Taiwaniana 59 (4): 326 - 330. DOI:10.6165/tai.2014.59.4.326
  • IUCN (2012). IUCN Red List Categories and Criteria: Version 3.1. Second edition. IUCN, Gland and Cambridge.
  • Hughes, M. (2008). An Annotated Checklist of South-East Sulawesi Asian Begonia. Royal Botanic Garden, Edinburgh.
  • Kiew, R. (2005). Begonia in Peninsular Malaya. Natural History Publications (Borneo).
  • Kiew, R. (2001). The limestone Begonias of Sabah, Borneo — flagship species for conservation. Gard. Bull. Singapore 53(1 - 2): 241 - 286.
  • Doorenbos, J., Sosef, M. S. M. & De Wilde, J. J. F. E. (1998). The sections of Begonia including descrip­tions, keys and species lists (Studies in Begoniaceae VI). Wageningen Agr. Univ. Pap. 98(2): 1 - 266.
  • Candolle, A. L. P. P. de (1859). Memoire sur la famille des Begoniacees. Ann. Sci. Nat, Bot, Ser. 4 11: 93 - 149.
  • Linnaeus C. (1753). Species plantarum. Laurentii Salvii, Holmiae [Stockholm].

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Bulletin
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Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0