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  1. Family: Orchidaceae Juss.
    1. Genus: Paphiopedilum Pfitzer
      1. Paphiopedilum callosum (Rchb.f.) Stein

        This species is accepted, and its native range is Indo-China to NW. Peninsula Malaysia.


    Thailand, Cambodia and Laos; 300–1300 m altitude.

    General Description

    A terrestrial herb. Leaves 3–5, narrowly elliptic, oblong-elliptic or obovate, tridenticulate at acute apex, 10–20 cm long, 3.2–4.8 cm wide, ciliate at base, tessellated pale and dark above, sometimes purple at base on lower surface. Inflorescence 1- (or rarely 2-) flowered, 20–40 cm tall; peduncle purple, purple-pubescent, 12–25 cm long; bract ovate to elliptic, acute to subacute, 1.5–2.8 cm long, 1.5–2 cm wide, green, sometimes marked with purple, ciliate. Flower large, 8–11 cm across; sepals white flushed with purple in lower half, veined with purple and green; petals white to yellow-green with a purple apical third, spotted with maroon on upper margin and sometimes in basal half; lip green, heavily flushed deep maroon; staminode pale green with darker veins, flushed purple; pedicel and ovary 3–6.5 cm long, green, flushed with purple, purple-pubescent. Dorsal sepal broadly ovate to subcircular, apiculate, 4–5.5 cm long, 4.2–6 cm wide, with recurved ciliate margins. Synsepal concave, elliptic or lanceolate, acute, 2.7–3.2 cm long, 1.6–2.5 cm wide. Petals sometimes reflexed, subsigmoid, ligulate, obtuse or rounded at apex, 4.6–6.8 cm long, 1.2–1.8 cm wide, maroon-ciliate. Lip 2.5–4.4 cm long, 2–2.5 cm wide, warty on incurved side-lobes. Staminode lunate, 11 mm long, 7 mm wide, apical lateral teeth falcate, acute to obtuse.


    Native to:

    Cambodia, Laos, Malaya, Myanmar, Thailand, Vietnam

    Accepted Infraspecifics


    Other Data

    Paphiopedilum callosum (Rchb.f.) Stein appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Thailand 54324.000
    Kerr, A.F.G. [486], Thailand K000595649
    Clulow, D., Thailand 45738.000
    Chittipanich, S.J. [14] 45603.000
    Sukhakul [12], Thailand 50816.000
    Regnier [s.n.], Thailand K000078061
    Regnier, Thailand K000078062


    First published in Orchid.-Buch: 457 (1892)

    Accepted by

    • Leong, K.F. (2013). Flora of Peninsular Malaysia - Cypripedioideae Malesian Orchid Journal 12: 117-131.
    • Koopowitz, H. (2012). An updated, annotated checklist of the genus Paphiopedilum Orchid Digest 76: 178-215.
    • Pedersen, H.Æ., Kurzwell, H., Suddee, S. & Cribb, P.J. (2011). Flora of Thailand 12(1): 1-302. The Forest Herbarium, National Park, Wildlife and Plant Conservation Department, Bangkok.
    • Sittisujjatham, S. (2009). Wild Orchid of Thailand 2: 1-463. Amarin.
    • Averyanov, L. (2008). The orchids of Vietnam illustrated survey part 1 Subfamilies Apostasioideae, Cyprioedioideae and Spiranthoideae Turczaninowia 11(1): 5-168.
    • Govaerts, R. (2003). World Checklist of Monocotyledons Database in ACCESS: 1-71827. The Board of Trustees of the Royal Botanic Gardens, Kew.



    • Reichenbach, H.G. Original description of Paphiopedilum callosum. (1892).


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    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2020. Published on the Internet at and
    © Copyright 2017 World Checklist of Selected Plant Families.

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checklist of Selected Plant Families 2020. Published on the Internet at and
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families.