1. Family: Orchidaceae Juss.
    1. Disa P.J.Bergius

      1. This genus is accepted, and its native range is Tropical & S. Africa, W. Indian Ocean.

    [FTEA]

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

    Habit
    Terrestrial herbs with tuberous roots
    Stem
    Stems unbranched, leafy
    Leaves
    Leaves scattered along the flowering stem or on separate sterile shoots
    Inflorescences
    Inflorescence terminal, 1- to many-flowered
    Flowers
    Flowers resupinate, variously coloured
    Calyx
    Sepals free, the dorsal erect, hooded or helmet-shaped, usually spurred, the laterals ± spreading
    Corolla
    Petals at the base ± adnate to the column, often included in the dorsal sepal, variable in shape
    Labellum
    Lip usually small and narrow, not spurred
    Column
    Column short; anther erect, horizontal or reflexed, the loculi parallel; pollinaria 2, each with sectile pollinium, caudicle and naked viscidium; stigmas united into a cushion below the rostellum, rostellum small, ± 3-lobed, the middle lobe small, folded, the side lobes short, fleshy, often adnate to the petals
    Ovary
    Ovary twisted, almost terete
    Fruits
    Capsule cylindric, club-shaped or narrowly ellipsoid.
    [FZ]

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

    Habit
    Terrestrial herb with perennating tubers.
    Tubers
    Tubers testicular, rarely absent.
    General
    Sterile shoots produced occasionally, to 15 cm long with several basal sheaths and several erect conduplicate acute leaves to 40 cm long. Fertile shoots to 100 cm tall.
    Leaves
    Leaves radical, basal or cauline, linear to ovate, soft to rigid, lax to imbricate, monomorphic to dimorphic, green at flowering time, occasionally hysteranthous, conduplicate to flat, grading into the floral bracts or sharply distinct from the floral bracts.
    Inflorescences
    Inflorescence racemose with one to numerous flowers.
    Flowers
    Flowers not resupinate, resupinate or doubly resupinate, 4–80 mm in diameter, usually red or white, rarely blue or yellow or green.
    Bracts
    Bracts usually green, ovate, acute or acuminate, rarely dry and brown.
    Calyx
    Lateral sepals lanceolate to broadly ovate, rounded to acuminate, often keeled, patent, sometimes ascending or descending. Dorsal sepal erect, galeate, rarely cucullate or dish-shaped, usually ovate, rarely oblong or spathulate, with a spur which is obsolete to 8 cm long, slender or rarely massive, rarely flattened or with a dorsal or ventral groove, horizontal, descending or ascending.
    Corolla
    Petals lanceolate to square, erect or reflexed, acute or truncate, the apex curving over the anther or over the rostellum, or curved out of the galea, often with a complex plane shape.
    Labellum
    Lip usually lanceolate, rarely spathulate or broadly ovate, occasionally linear.
    Column
    Rostellum 3-lobed; lateral lobes erect, square or horn-like, flat or canaliculate, free or fused to the petals by a long keel; central lobe usually small, fleshy, rarely tall.
    Anthers
    Anther 2-celled, horizontal, ascending or pendent; viscidia usually separate, borne on the lateral rostellum arms.
    Stigma
    Stigma pedicellate or sessile, the surface flat, concave or convex, tripulvinate with the rear cushion often smaller than the lateral cushions.
    [FZ]

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

    Habit
    Terrestrial herb, perennating by tubers.
    Tubers
    Tubers testicular.
    Leaf sheaths
    Basal sheaths hyaline, obtuse.
    Leaves
    Leaves cauline, usually imbricate; leaf bases sheathing; blades usually erect, elliptic to linear-lanceolate, the lowermost the largest, the upper grading into the floral bracts.
    Inflorescences
    Floral bracts often overtopping the flowers, ovate to lanceolate, acute to acuminate. Inflorescence dense to lax, cylindric to secund.
    Flowers
    Flowers resupinate, purplish, brown or green.
    Calyx
    Dorsal sepal shallowly galeate, 2.5–15 mm long, usually oblong, obtuse, usually with a spur pendent from the base of the galea; spur slender or clavate, obsolete to longer than the galea. Lateral sepals patent or reflexed, often shorter than the galea, usually oblong.
    Corolla
    Petals obliquely narrowly ovate-oblong, acute to bifid; the broad base enclosing the anther; the apex erect within the galea, or partially exserted from the galea.
    Labellum
    Lip patent to pendent, linear to elliptic, subfleshy.
    Anthers
    Anther horizontal to semi-pendent with a single large concrete viscidium and 2 cells.
    Column
    Rostellum simple with a deep notch containing the viscidium and with 2 often well developed lateral flanges flanking the anterior part of the anther.
    Stigma
    Stigma equally or unequally tripulvinate, shortly stipitate to as tall as the rostellum.
    Ovary
    Ovary usually twisted, 5–25 mm long.
    [FZ]

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

    Anthers
    Anther horizontal or ± pendent, 2-celled with cells parallel; viscidia 2, separate or fused.
    Column
    Rostellum erect, lanceolate, acute, equally 3-lobed, rarely with the lateral lobes canaliculate and the central lobe absent.
    Stigma
    Stigma horizontal, shortly pedicellate, the odd lobe smaller than the lateral lobes.
    Ovary
    Ovary patent to ± spreading, 1–1.3 cm long.
    Habit
    Terrestrial herb perennating by tubers.
    Tubers
    Tubers testicular, 1–6 cm long.
    Stem
    Stem erect, grasslike, 10–100 cm tall, base usually sheathed in old leaf fibres.
    Leaves
    Basal leaves 5–20, linear, flat or rolled, subsclerophyllous, produced during, before or after flowering; cauline leaves brown, scattered or imbricate on the stem, acuminate.
    Inflorescences
    Inflorescence lax, 1–30-flowered.
    Bracts
    Bracts dry, usually not as long as the flowers, ± broadly ovate, acuminate to setaceous.
    Flowers
    Flowers resupinate, usually blue or shades of blue, to white with pale blue veins, rarely purplish-red with green parts.
    Perianth
    Spur borne horizontally from the base of the galea, at length straight, decurved or curved upwards, rarely longer than the sepals, cylindrical or conical.
    Calyx
    Lateral sepals usually patent, 6–30 mm long, lanceolate to ovate, obtuse to acute. Dorsal sepal erect to angled forwards, generally galeate, rounded to acuminate, usually ovate in front view.
    Corolla
    Petals with a basal anticous lobe; lobe oblong-ovate, flanking the stigma; petal limb lower part linear or lorate, reflexed and flanking the anther; petal limb upper part lanceolate to expanded fan-like or more or less bifid, gently to abruptly curving upwards behind or near the apex of the anther.
    Labellum
    Lip ± dissected, rarely entire, usually ovate in outline, rarely spathulate, always specialized in some way.

    Images

    Distribution

    Native to:

    Angola, Burundi, Cameroon, Cape Provinces, Central African Repu, Congo, Ethiopia, Free State, Gabon, Guinea, Ivory Coast, Kenya, KwaZulu-Natal, Lesotho, Liberia, Madagascar, Malawi, Mozambique, Niger, Nigeria, Northern Provinces, Rwanda, Réunion, Sierra Leone, Sudan, Swaziland, Tanzania, Uganda, Yemen, Zambia, Zaïre, Zimbabwe

    Introduced into:

    South Australia, Tasmania, Victoria, Western Australia

    Disa P.J.Bergius appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Zambia 17326.014
    Zambia 33968.000
    Zambia 34407.000
    Holmes, W.D. [020 or 0143], Zambia 75902.000
    Williamson, G. [725], Zambia 11887.015
    Williamson, G. [632], Zambia 17326.010
    Williamson, G. [652], Zambia 1800.068
    Williamson, G. [713], Zambia 33139.000
    Williamson, G. [659], Zambia 33144.000
    Williamson, G. [307], Zambia 33162.000
    Williamson, G. [682], Zambia 33167.000
    Williamson, G. [624], Zambia 33754.000
    Williamson, G. [184], Zambia 6049.372
    Morze, G. [147], Zambia 31769.000
    Holmes [14], Zambia 77386.000
    Holmes [113 106 107] 77387.000
    Roberts, D. [119 or 120], Madagascar 76704.000

    First published in Descr. Pl. Cap.: 348 (1767)

    Accepted by

    • Bytebier, B., Bellstedt, D.U. & Linder, H.P. (2008). A new phylogeny-based sectional classification for the large African orchid genus Disa Taxon 57: 1233-1251.
    • 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: 275.
    • Pl. Cap. 348, t. 4, fig. 7 (1767)
    Flora Zambesiaca
    • Descr. Pl. Cap.: 348 (1767).
    Flora of Tropical East Africa
    • Fl. Cap.: 348 (1767)

    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

    Kew Science Photographs
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/