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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

Morphology General Habit
Terrestrial herb with fleshy or tuberous roots and leafy, unbranched stems.
Morphology Reproductive morphology Flowers
Flowers resupinate, usually yellow, orange or greenish, rarely white, often in short, dense heads.
Morphology Reproductive morphology Flowers Calyx
Sepals free, the dorsal sepal forming a hood with the petals.
Morphology Reproductive morphology Flowers Labellum
Lip entire or 3-lobed, spurred.
Morphology Reproductive morphology Flowers 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.
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigmatic processes thickened with rounded ends.

[FTEA]

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

Morphology General Habit
Terrestrial herbs with fleshy or tuberous roots
Morphology Stem
Stems unbranched, ± leafy
Morphology Leaves
Leaves scattered along the stem or the majority in a tuft at the base, usually narrow
Morphology Reproductive morphology Inflorescences
Inflorescence terminal, 1-many-flowered
Morphology Reproductive morphology Flowers
Flowers resupinate, usually orange or yellow or greenish, rarely white
Morphology Reproductive morphology Flowers Calyx
Sepals free, the laterals deflexed, the dorsal forming a helm with the 2 petals
Morphology Reproductive morphology Flowers Corolla
Petals usually adherent to the dorsal sepal, usually simple but rarely with a short lobe at the base of the front margin
Morphology Reproductive morphology Flowers Labellum
Lip free, calcarate, simple or with short side lobes; spur cylindrical
Morphology Reproductive morphology Flowers 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
Morphology Reproductive morphology 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).

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
Williamson, G. [341], Zambia 1800.048
Williamson, G. [333], Zambia 1800.067
Williamson, G. [331], Zambia 27461.032
Williamson, G. [674], Zambia 33149.000
Williamson, G. [693], Zambia 33886.000
Zambia 34410.000

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)

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

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

Orchideae: e-monocot.org
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