1. Family: Orchidaceae Juss.
    1. Platycoryne Rchb.f.

      1. This genus is accepted, and its native range is Tropical & S. Africa, Madagascar.

    [FZ]

    Orchidaceae, I. la Croix & P.J. Cribb. Flora Zambesiaca 11:1. 1995

    Habit
    Terrestrial herb with fleshy or tuberous roots and leafy, unbranched stems.
    Flowers
    Flowers resupinate, usually yellow, orange or greenish, rarely white, often in short, dense heads.
    Calyx
    Sepals free, the dorsal sepal forming a hood with the petals.
    Labellum
    Lip entire or 3-lobed, spurred.
    Column
    Column erect, anther erect with parallel loculi, canals adnate to side lobes of rostellum. Rostellum large, usually placed in front of anther which is often over-topped by the mid-lobe; lateral lobes porrect, usually projecting beyond the hood but sometimes short and shoulder-like.
    Stigma
    Stigmatic processes thickened with rounded ends.
    [FTEA]

    Orchidaceae, V. S. Summerhayes. Flora of Tropical East Africa. 1968

    Habit
    Terrestrial herbs with fleshy or tuberous roots
    Stem
    Stems unbranched, ± leafy
    Leaves
    Leaves scattered along the stem or the majority in a tuft at the base, usually narrow
    Inflorescences
    Inflorescence terminal, 1-many-flowered
    Flowers
    Flowers resupinate, usually orange or yellow or greenish, rarely white
    Calyx
    Sepals free, the laterals deflexed, the dorsal forming a helm with the 2 petals
    Corolla
    Petals usually adherent to the dorsal sepal, usually simple but rarely with a short lobe at the base of the front margin
    Labellum
    Lip free, calcarate, simple or with short side lobes; spur cylindrical
    Column
    Column erect, the anther upright, loculi parallel, contiguous, canals varying in length, rarely scarcely developed, adnate to the side lobes of the rostellum; pollinaria 2, each with sectile pollinium, a long caudicle and elliptical viscidium; stigmatic processes distinct, decurved, thick with rounded knob-like apices, the rostellum either between the anther-loculi or standing out in front of the anther, 3-lobed, ± erect, the middle lobe often overtopping the anther, the side lobes porrect and usually projecting beyond the hood, sometimes short and shoulder-like
    Fruits
    Capsules oblong or fusiform.
    [O-EM]
    Distribution

    A genus of 20-25 species in tropical Africa and Madagascar. Most species form colonies in seasonally wet grassland and marshes. (PC).

    Ecology

    Platycoryne species are terrestrial herbs with fleshy or tuberous roots. They usually grow in wet areas such as wet grassland, marshes, seepage zones among rocks, permanently wet dambo, wet vlei, swamps, and land adjacent to streams. Platycoryne macroceras Summerh. and P. isoetifolia P. J. Cribb are therefore unusual as they grow in drier conditions, in dry grassland or dambo. Some Platycoryne species occur in woodland, including Brachystegia woodland (e.g. P. crocea Rolfe). Substrates in which members of the genus have been recorded to grow include sandy, peaty, and stoney soils, shallow soils overlying laterite or rock, and granite outcrops. Most Platycome species grow at relatively high elevations, ranging from 700-2200 m (la Croix and Cribb 1995), although a few may be found at lower elevations according to Summerhayes (1968). The elevational range of P. buchananiana is cited as 550-1850 m and that of P. mediocris as 200-1600 m.
    Platycorne plants perennate by means of tubers and often form colonies in favourable habitats (la Croix and Cribb 1995). Colonies of the widespread species P. buchananiana Rolfe are distinctive in having two colour forms, either orange or yellow. Flowering occurs between October and March, and some fruiting Platycorne specimens have been collected from this period as well, such as P. protearum Rolfe (la Croix and Cribb 1995). Some members of the genus are narrow endemics such as P. affinis Summerh. endemic to Zimbabwe and P. isoetifolia endemic to Zambia, whereas others are more widespread, especially P. crocea Rolfe, which grows throughout the tropical African range of the genus (Summerhayes 1968; la Croix and Cribb 1995). (RN).

    General Description

    Terrestrial herbs with fleshy tubers and leafy, unbranched stems. Leaves cauline, lowermost often clustered, those above smaller and grading into the bracts. Inflorescence one- to densely flowered, often in short, dense heads; bract lanceolate, shorter than to a long as the flowers. Flowers resupinate, usually yellow or orange, rarely greenish or white. Sepals free, the dorsal sepal forming a hood with the petals. Petals entire, smaller than the sepals. Labellum pendent, entire or three-lobed, spurred; side lobes, if present, usually much shorter than the mid-lobe. Column erect, anther erect with parallel loculi, canals adnate to side lobes of rostellum; rostellum large, usually placed in front of anther, which is often overtopped by the mid-lobe; lateral lobes porrect, usually projecting beyond the hood but sometimes short and shoulder-like; stigmatic processes short, thickened with rounded ends. (PC).

    Images

    Distribution

    Native to:

    Angola, Benin, Burkina, Burundi, Cameroon, Central African Repu, Chad, Congo, Ethiopia, Gabon, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Kenya, Madagascar, Malawi, Mali, Mozambique, Nigeria, Northern Provinces, Senegal, Sierra Leone, Sudan, Tanzania, Uganda, Zambia, Zaïre, Zimbabwe

    Platycoryne Rchb.f. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Zambia 34410.000
    Williamson, G. [341], Zambia 1800.048
    Williamson, G. [333], Zambia 1800.067
    Williamson, G. [674], Zambia 33149.000
    Williamson, G. [693], Zambia 33886.000
    Williamson, G. [331], Zambia 27461.032

    First published in Bonplandia (Hannover) 3: 212 (1855)

    Accepted by

    • Govaerts, R. (2003). World Checklist of Monocotyledons Database in ACCESS: 1-71827. The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Pridgeon, A.M., Cribb, P.J., Chase, M.C. & Rasmussen, F.N. (2001). Orchidoideae (Part 1) Genera Orchidacearum 2: 1-416. Oxford University Press, New York, Oxford.

    Literature

    Flora of West Tropical Africa
    • F.T.A. 7: 255.
    • in Bonplandia 3: 212 (1855)
    Flora Zambesiaca
    • Summerhayes in Kew Bull. 13: 58–73 (1958).
    • in Bonplandia 3: 212 (1855).
    Flora of Tropical East Africa
    • Summerh. in K.B. 13: 58 (1958)
    • in Bonplandia 3: 212 (1855)

    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 2020. 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 2020. 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

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