1. Family: Malvaceae Juss.
    1. Genus: Pterygota Schott & Endl.
      1. Pterygota mildbraedii Engl.

        This species is accepted, and its native range is Togo, Cameroon to W. Tanzania and N. Zambia.

    [FTEA]

    Sterculiaceae, Martin Cheek & Laurence Dorr; Nesogordonia, Laurence Dorr, Lisa Barnett. Flora of Tropical East Africa. 2007

    Type
    Type: Rwanda, near Lac Muhazi, Mildbraed 581 (B, presumed destroyed, holo.)
    Habit
    Deciduous tree 30–40 m tall; trunk buttressed, grey, smooth; flowering branchlets ± 5 mm diameter, glabrous, lacking conspicuous lenticels
    Leaves
    Leaf-blade broadly ovate in outline, shallowly (3–)5-lobed, 12–30 cm long, 10–23 cm wide (smaller leaves from flowering branchlets), apex shortly acuminate, base cordate to deeply cordate, digitately 5-nerved, glabrous above, and below when mature (expanding leaves and stems densely and entirely covered with 10–12-armed golden brown stellate hairs, these persisting only on the apex of the petiole), domatial pockets webbed, stellately hairy, conspicuous; petiole (6–)12–17 cm long, (0.1–)0.2–3 mm diameter.
    Inflorescences
    Inflorescences 2–5 per branchlet, golden brown stellately tomentose as the young leaves, borne singly in the uppermost axils, each (2.7–)5–6 cm long, 2 mm diameter, bearing 3–5 partial peduncles; bracts orbicular, concave, 9 mm long, partial peduncle 8–12 mm long, bearing 2–3 bracteoles similar to the bracts and at the apex ± 3 flowers, pedicel ± 4 mm long
    Flowers
    Male flower with outer indumentum as inflorescence, divided for 5/6, lobes oblong, 10–11 mm long, 4 mm wide, basal part saucer-shaped, 2 mm long, 5 mm wide, inner surface densely papillate, upper half of lobes densely stellate; androgynophore 5 mm long, glabrous, base dilated, surrounded by stellate hairs, apex with subcylindrical head of anthers 2.5 mm long, 2.5 mm wide Female flowers as the male, androgynophore <1 mm, carpels, stamens forming a cylinder ± 4 mm diameter; carpels ovoid, ± 6 mm long, 3–4 mm wide, villose, styles slender, ± 4 mm long, revolute
    Male
    Male flower with outer indumentum as inflorescence, divided for 5/6, lobes oblong, 10–11 mm long, 4 mm wide, basal part saucer-shaped, 2 mm long, 5 mm wide, inner surface densely papillate, upper half of lobes densely stellate; androgynophore 5 mm long, glabrous, base dilated, surrounded by stellate hairs, apex with subcylindrical head of anthers 2.5 mm long, 2.5 mm wide
    Female
    Female flowers as the male, androgynophore <1 mm, carpels, stamens forming a cylinder ± 4 mm diameter; carpels ovoid, ± 6 mm long, 3–4 mm wide, villose, styles slender, ± 4 mm long, revolute
    Fruits
    Fruit with carpels ellipsoid, 9–11 cm long, 8–12 cm wide, carpel wall 9–17 mm thick, outer surface indumentum as inflorescence; seeds with wing obovate to oblong, 8.5–10 cm long, 2.8–3.5 cm wide.
    Ecology
    Evergreen forest; 750–1550 m
    Conservation
    This species appears to be widespread and common, and its habitat not significantly threatened as far as is known. It is provisionally rated here as of “least concern” for conservation.
    Note
    The identity of Schumann’s ?Pterygota alata and of Pterygota schumanniana Engl., which was based upon it and validated by Schumann’s description (Art. 33 of the Code, see Note 2 and Example 9) is almost certainly P. mildbraedii. This conclusion is contrary to that reached by Wild (F.Z. 1: 562, 1961) who attributed these names to the lowland coastal species. The main evidence against Wild is that Schumann ( loc. cit.) cites a specimen from a locality that is clearly in western Tanzania, near the inland lakes and amongst the mountains and is thus within the distribution of P. mildbraedii, the only species of the genus to occur there. I have not traced the specimen, nor the exact locality names (Kavendo, Ratuma R.) cited by Schumann. However, it is likely that Ratuma R. is a misspelling for Katuma River, which occurs in T 4.
    Distribution
    Flora districts: U1 U2 U4 T1 T4 Range: Cameroon, Congo-Kinshasa, Rwanda, Burundi, Zambia
    [FZ]

    Sterculiaceae, H. Wild. Flora Zambesiaca 1:2. 1961

    Habit
    Tall tree up to 60 m. tall with a smooth trunk and pale grey bark, branching high up; young branches minutely stellate-puberulous.
    Leaves
    Leaf-lamina up to 40 × 30 cm., broadly ovate, apex subacute, deeply cordate at the base, subentire or shallowly 3-lobed, glabrous on both sides, 7–9-nerved from the base, nervation prominent on both sides, venation reticulate, prominent on both sides; petiole 15 cm. or more long, glabrous or stellate-puberulous near the apex.
    Flowers
    Flowers and fruits not seen from our area.

    Distribution

    Native to:

    Burundi, Cameroon, Mozambique, Rwanda, Tanzania, Togo, Uganda, Zambia, Zaïre

    Pterygota mildbraedii Engl. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Oct 1, 2008 Cheek, M. [13480], Cameroon K000580045
    Dec 1, 2003 Etuge, M. [4693], Cameroon K000460124
    Eggeling, W.J. [5998], Uganda 15388.000
    Eggeling, W.J. [6227], Tanzania 15996.000
    Watkins [434], Tanzania 11833.000
    Brunt, M.A. [1259], Cameroon K000094715

    First published in G.W.J.Mildbraed (ed.), Wiss. Erg. Deut. Zentr.-Afr. Exped., Bot. 2: 506 (1912)

    Accepted by

    • Kalema, J. & Beentje, H. (2012). Conservation checklist of the trees of Uganda: 1-235. Kew Publishing, Royal Botanic Gardens, Kew.
    • Cheek, M. & Dorr, L. (2007). Flora of Tropical East Africa, Sterculiaceae: 1-134.
    • Exell, A.W. & Wild, H. (eds.) (1961). Flora Zambesiaca 1(2): 337-581. Royal Botanic Gardens, Kew.
    • Robyns, W. & al. (eds.) (1948-1963). Flore du Congo Belge et du Ruanda-Urundi 1-10.

    Literature

    Kew Backbone Distributions
    • Kalema, J. & Beentje, H. (2012). Conservation checklist of the trees of Uganda: 1-235. Kew Publishing, Royal Botanic Gardens, Kew.
    • Cheek, M. & Dorr, L. (2007). Flora of Tropical East Africa, Sterculiaceae: 1-134.
    • Brunel, J.F., Hiepo, P. & Scholz, H. (eds.) (1984). Flore Analytique du Togo Phanérogames: 1-751. GTZ, Eschborn.
    • Exell, A.W. & Wild, H. (eds.) (1961). Flora Zambesiaca 1(2): 337-581. Royal Botanic Gardens, Kew.
    Flora of Tropical East Africa
    • Troupin, Fl. Rwanda 2: 406, f. 127.2 (1983).
    • Troupin, Fl. Pl. Lig. Rwanda: 666, f. 228.2 (1982)
    • Hamilton, Uganda For. Trees: 116 (1981)
    • F.C.B. 10: 261, f. 23 (1963)
    • F.Z. 1: 561 (1961)
    • Z.A.E.: 506 (1912)

    Sources

    Flora Zambesiaca
    Flora Zambesiaca
    http://creativecommons.org/licenses/by-nc-sa/3.0

    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.

    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