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This species is accepted, and its native range is N. Angola, Kenya to Tanzania.
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: see note.
Morphology General Habit
Herb, possibly perennial, erect, procumbent or straggling, 20–60 cm high or to 90 cm long; stem swollen at base, succulent higher up, green with red streaks, glabrous.
Morphology Leaves Stipules
Stipules persistent, reddish, ovate to broadly ovate, 3–8 mm long, with entire margins.
Morphology Leaves
Leaves green above (and sometimes glaucous), green or often reddish beneath, ovate in outline, asymmetric, 5–18 × 2–8.5 cm, one side larger, up to 1.3 times the width of the other and with a rounded basal lobe with 2–3 main veins and 1/4 to 1/3 the total length of the lamina, base cordate, margin crenate, apex acuminate, sparsely pilose or glabrous; venation palmate-pinnate, the main vein at an angle to the petiole; petiole often reddish, or with red spots, (3–)6–16 cm long, with ring of white hairs at the junction with the lamina. Inflorescence an axillary dichasial cyme, with up to 6(–12) flowers; peduncle reddish, (3–)6–23 cm long, glabrous; each ramification subtended by a pair of opposite bracts 2–5 mm long, membranous; pedicels 5–23 long with 2 minute bracteoles on those of the ♀ flowers.
Morphology Reproductive morphology Flowers
Male flowers: tepals 4, free, pink to white, the outer obovate, 6–15 × 4–10 mm, the inner obovate, 7–19 × 5–13 mm; stamens numerous, filaments free, 1–4 mm long, anthers ellipsoid to subglobose, 0.5–1 mm. Female flowers: tepals 5, pink to white, obovate, 5–13 × 3–8 mm; ovary globose to ellipsoid, 7–8 mm long, 3-locular, 3-winged; placentation axile; styles 3, shortly forked halfway or at apex, glabrous, persistent; stigmatic band yellow, horseshoe-shaped, twisted.
Morphology Reproductive morphology Fruits
Fruit a brown capsule with red wings, globose, ovoid or ellipsoid, 7–11 × 6–9 mm excluding the wings; wings very unequal, one laterally triangular and 12–27 mm wide, the other two triangular, rounded, 6–8 mm wide; dehiscence along the junction with the wings. Fig. 2, p. 5.
Ecology
On steep rocks in forest or in moist sites, less often in forest without any specification; local, rarely locally common; 750–2400 m.
Conservation
Least concern (LC).
Note
Typification unclear: the protologue starts with an ‘ined.’ Latin description of B. johnstonii by Oliver, based on Johnston s.n. from Kilimanjaro, ‘5000–6000 feet’; the plate and main description (in English) by Hooker are based on plants grown at Kew, flowered in April 1886, from material sent by Bishop Hannington from Masailand – and there is a specimen dated 1883 at Kew. Irmscher states the Johnston plant is the holotype. We incline towards the Kew ones.
Distribution
Flora districts: K1 K4 K6 K7 T2 T3 T6 T7 Range: Not known elsewhere

Native to:

Angola, Kenya, Tanzania

Begonia johnstonii Oliv. ex Hook.f. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Drummond, R.B. [2765], Tanzania 11564.000
Greenway, P.J., Tanzania 16614.000
Tanzania 17230.000
s.coll. [s.n.], Kenya 9970.000
Drummond, R.B. [2728], Tanzania 9971.000
Johnston, H.H., Tanzania K000242765 holotype
Archer, P. [8038], Kenya K000242766
Hannington, J. [s.n.], Kenya K000739942 Unknown type material
Hannington, J. [s.n.], Kenya K000739944
Hannington, J. [s.n.], Kenya K000739943 Unknown type material

First published in Bot. Mag. 112: t. 6899 (1886)

Accepted by

  • Govaerts, R. (1996). World Checklist of Seed Plants 2(1, 2): 1-492. MIM, Deurne.
  • Lautenschläger, T. & al (2020). New records for the flora of Angola: observations from Uíge and Cuanza Norte Plant Ecology and Evolution 153: 132-142.

Literature

Kew Backbone Distributions

  • Lautenschläger, T. & al (2020). New records for the flora of Angola: observations from Uíge and Cuanza Norte Plant Ecology and Evolution 153: 132-142.

Flora of Tropical East Africa

  • Bot. Mag. 112: t. 6899 (1886)
  • Cribb & Leedal, Mountain Fl. S Tanzania: 53, pl. 7a (1982)
  • E.J. 81: 149 (1961)
  • U.K.W.F. ed. 2: 92 (1994).

Art and Illustrations in Digifolia
Digital Image © Board of Trustees, RBG Kew

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