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


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

Begonia ltahensis is only known from one locality. It is likely to be found in similar habitats in Borneo and more extensive collections from the region are needed to confirm its distribution. The conservation status of Data Deficient (DD) is most appropriate for this species (IUCN 2012).
Only known from one location in East Kalimantan, in the Indonesian part of Borneo. Map 1.
Terrestrial herb from a hillside in mixed lowland dipterocarp forest, frequently along stream margins in damp places, alt. 141 m.
Morphology General Habit
Cane-like begonia to 50 cm tall, sparsely covered with pale brown hairs
Morphology Leaves
Leaves alternate, oblique, distant, held more or less vertically; petiole dark red to brownish red, 10 - 20 cm long, sparse hairs, getting rather dense near the base of lamina, canaliculate above; lamina rather grooved above with scattered short hairs near the base through the vein and prominent beneath with scattered hairs along the vein, asymmetric, broadly ovate, 20 - 27 x 11 15 cm, margin slightly dentate, apex acute; venation palmate-pinnate, veins reddish at base and becoming pale green near the apex, slightly hairy near the base, 2 - 3 pairs along the midrib, 2 veins in basal lobe, impressed above, prominent beneath
Morphology Leaves Stipules
Stipules reddish at base and green towards the apex, narrowly triangular, c. 3.5 x 1 cm, hairy along the middle, margin entire, apex acuminate, persistent
Morphology Reproductive morphology Flowers
Female flowers pedicel reddish, 10 - 20 mm long, with thinly scattered hairs; ovary pink with scattered hairs near the base, 10 - 15 x 10 - 13 mm, wings 3, subequal, locules 3, placentas 2 per locule; tepals 5, not isomorphic, pinkish, lanceolate, 9 - 10 x 4 - 5 mm with scattered hairs at the base, margin entire, apex rounded; styles 3, yellow, wide Y-shaped, c. 5 mm long, divided to base; stigma yellow, papillose, forming a continuous twisted band Male flowers pedicel light red, 10 - 13 mm long c. 5 mm long, glabrous; tepals 2, white and rosy at base through the middle, rounded to broadly ovate, c. 5 x 5 mm, margin entire, apex rounded; stamens c. 20, clustered not globose, filaments yellow, c. 0.5 - 1.2 mm long; anthers yellow, oval to oblong, c. 1 - 1.2 mm long, apex emarginate
Morphology Reproductive morphology Fruits
Fruit single or pairs on the lower stem or rhizome, 11 - 12 x 10 - 11 mm, pale green, sparsely hairy at base, locules 3, wings 3, subequal, dehiscing between the locule and wing; pedicel pendent, reddish brown, c. 2 cm long, sparsely hairy
Morphology Reproductive morphology Inflorescences
Inflorescences protogynous, axillary; male and female inflorescences separate, a single or pair of female flowers at the lower stem or rhizome, male inflorescences with many flowers, cymes, total length of inflorescences 2.5 – 3 cm long, peduncle c. 1.5 cm; bracts in female inflorescences: pale green, glabrous, 6 - 8x4- 5 mm, margin entire, ovate, persistent; male inflorescences: rounded to broadly obovate, margin dentate with rounded glands; bracteoles in male flowers similar to bract, pale green, glabrous, margin dentate with unusual glands at the end of teeth, broadly obovate to rounded, c. 3 x 2 mm, persistent
Morphology Reproductive morphology Seeds
Seed barrel-shaped, ovoid to ellipsoid, 0.3 - 0.35 mm long, collar cells more than a half the seed length
Morphology Stem
Stems dark red to brownish red, 7 - 10 mm thick, internodes, 3 - 6 cm apart, succulent, unbranched, slightly swollen at the nodes, rooting at base
Begonia ltahensis is similar to B. calcarea Ridl. in erect habit, leaf shape, number of female flowers and fruits but differs in the male inflorescence, male and female tepal colour and the tepal margins in male and female flowers. The species is named after the type locality “Ltah” a small stream at Unggun forest in Berau Regency, East Kalimantan, Indonesia. Similar to Begonia calcarea Ridl. in habit, female flowers from leaf axils or from the rhizome and the number of female flower tepals. Differs in erect stem, male inflorescence cymes, pinkish female tepal colour, and tepal margin entire.
Type: Indonesia, East Kalimantan, Berau Regency, Kelay Distr., Long Duhung Village, Unggun Forest along Ltah R., 100 - 150 m alt., 2 May 2015, Deden Girmansyah Deden 2092 (holotype BO!).

Native to:


Begonia ltahensis Girm. appears in other Kew resources:

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


Kew Bulletin

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  • 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
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  • 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.

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at and
© Copyright 2017 World Checklist of Selected Plant Families.

Kew Bulletin
Kew Bulletin

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at and
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families.