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This species is accepted, and its native range is Tanzania (Usambara Mountains).
A specimen from Kew's Herbarium

[FTEA]

Begoniaceae, Vanessa Plana, Martin J.S. Sands & Henk J. Beentje. Flora of Tropical East Africa. 2006

Type
Type: Tanzania, Lushoto District: E Usambara, Sigi, Engler 640 & 841 (B, syn.).
Morphology General Habit
Herb to 120 cm, usually epilithic, prostrate basally; stem red- or purple-flecked, fleshy, thickest at base, not branched, 13–15 mm in diameter, with many long purple hairs or glabrous. Stipules persistent, broadly ovate, 11–15 mm long, acute, glabrous.
Morphology Leaves
Leaves red- or purple-flecked, slightly fleshy, oblong-ovate, oblique, 9–30 × 4.5–13 cm, one side 1.5–2 times wider than the other, the larger with a basal rounded lobe with 3–4 main veins 1/3 to 1/2 of the lamina length, base cordate, margin deeply doubly-serrate, apex shortly acuminate, sparsely pilose; venation palmate-pinnate, the main vein at an angle to the petiole; petiole 3–14 cm long, with rings of hairs or fimbriate trichomes to 8 mm long near junction with lamina.
Morphology Reproductive morphology Inflorescences
Inflorescence an erect axillary dichasial cyme; peduncle purple-flecked, 5–17 cm long, glabrous or sparsely pilose; bracts soon caducous, membranous, broadly ovate, 7–9 mm long; pedicels of ♂ 1–2.7 cm long, of ♀ to 1 cm long; female flowers with two small bracteoles at base.
Morphology Reproductive morphology Flowers
Male flowers: tepals 4, pink, the outer obovate and 9–14 × 6–14 mm, the inner slightly smaller; stamens many, filaments slightly connate at base, anthers obovoid. Female flowers: tepals 5, pink, obovate-orbicular, 5–9.5 × 3–6 mm; ovary ellipsoid, 4–7 mm long, 3-locular, 3-winged; placentation axillary; styles 3, divided halfway, the branches twisted, persistent in fruit; stigmatic band continuous, spiral.
Morphology Reproductive morphology Fruits
Fruit a 3-winged brown papery capsule 1.2–2.6 cm long, the wings usually sub-equal, triangular, (0.6–)0.7–2.4 cm wide, rounded, dehiscing at the juction with the wings.
Ecology
Moist rock faces in the forest zone (or once in the dry bushland zone); (350–)800–1800 m.
Conservation
Vulnerable (VU).
Distribution
Flora districts: T3 Range: Not known elsewhere

Native to:

Tanzania

Begonia engleri Gilg appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Greenway, P.J. [722], Tanzania 16613.000
Greenway, W 25399.000
Verdcourt [250], Tanzania K000242763
Verdcourt [250], Tanzania K000242764

First published in Bot. Jahrb. Syst. 34: 97 (1904)

Accepted by

  • Govaerts, R. (1996). World Checklist of Seed Plants 2(1, 2): 1-492. MIM, Deurne.

Literature

Flora of Tropical East Africa

  • E.J. 81: 147 (1961).

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

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 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