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This species is accepted, and its native range is Kenya to Tanzania.

[FTEA]

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

Type
Type: see note.
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.
Stipules
Stipules persistent, reddish, ovate to broadly ovate, 3–8 mm long, with entire margins.
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.
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.
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:

Kenya, Tanzania

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

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

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.

Literature

Flora of Tropical East Africa

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

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
'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
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