1. Family: Begoniaceae C.Agardh
    1. Genus: Begonia L.
      1. Begonia johnstonii Oliv. ex Hook.f.

        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

    Images

    Distribution

    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)

    Sources

    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 2019. 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 2019. 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