1. Family: Araceae Juss.
    1. Genus: Alocasia (Schott) G.Don
      1. Alocasia hypoleuca P.C.Boyce

        This species is accepted, and its native range is SE. Thailand.

    [CATE]

    CATE Araceae, 17 Dec 2011. araceae.e-monocot.org

    Distribution
    Southeastern Thailand, Chanthaburi, Khao Soi Dao range, road to Ban Tamun.
    Endemic to Thailand
    Diagnostic

    Alocasia hypoleuca is evidently closely related to A. macrorrhizos but readily distinguished by the very tall, slender, leafless stems that remain self supporting long after stems of similar length would be decumbent in A. macrorrhizos, the leaves conspicuously glaucous abaxially, the spathe limb internally and to an extent externally glaucous, the much more numerous and smaller synandria (ca 1 mm diam) with flat (not convex) synconnectives, the proportionately shorter (less than one third the spadix length) appendix and the deeply cleft, erect stigma lobes. The spathe is marcescent into fruiting (vs. deliquescent).
    General Description
    Very large to massive pachycaul evergreen herb to 3 m with clear latex. Stem erect to ca 2 m or more, slender and self-supporting, very seldom decumbent. Leaves several together, clustered at the tips of stems of larger plants. Petioles to 0.75–1 m long, sheathing in lower 1/3 – 1/4. Lamina ovato-sagittate, bluntly triangular in general outline, held more or less erect, ca 100 by 50 cm, light green adaxially, conspicuously glaucous abaxially; primary lateral veins on each side of the anterior costa diverging at ca 60º; glands in axils of primary veins on abaxial side distinct; secondary venation flush with the lamina , forming poorly defined interprimary collective veins; posterior lobes ca 1/3 – 1/2 the length of the anterior, somewhat rotund, naked in the sinus in adult plants, peltate in juveniles. Inflorescences paired among the leaf bases, subtended by membranous cataphylls. Peduncle barely exceeding the cataphylls at anthesis. Spathe ca 24–26cm long, constricted about ¼ of the way from the base; lower spathe ovoid, glaucous yellow-green; limb narrowly oblongo-lanceolate, 20– 22 cm long, cowl-like at anthesis, remaining hooded and then marcescent, pale green, conspicuously glaucous internally, less so externally. Spadix slightly shorter than the spathe, weakly glaucous, sessile; female flower zone ca 3 by 1.5 cm; ovaries globose, ca 2.5 mm diam., mid-green, stigma sessile, 3-lobed, the lobes blunt, deeply incised and erect, deep yellow; sterile interstice ca 2 times the length of the female zone, white, conspicuously narrowed corresponding to the spathe constriction; synandrodia elongated rhombohexagonal, ca 5 by 2 mm, the lower ones prismatic and not connate and thus staminodial, distinctly raised, proximally ivory and slightly glaucous, synandrodes on the main, narrowed part of the interstice white; male flower zone cylindric, ca 8 by 1 cm., dirty whitish cream, slightly glaucous; synandria 3–5 androus, rhombo-hexagonal, synconnective flat, ca 1 by 2 mm diam.; appendix less than 1/3 the length of the spadix, very slightly thicker than the male zone at the base, thence tapering, with conspicuous brain-like patterning of longitudinal grooves, pale cream. Fruiting spathe ovoid, ca 6–9cm long, green. Fruits not observed.
    Habitat
    Dry evergreen forest on granite
    [CATE]
    Use
    Alocasia hypoleuca has potential as a landscaping ornamental, and would make an excellent candidate for ex situ conservation (in a broad sense) through the medium of ornamental horticulture sustained by tissue culture.

    Distribution

    Native to:

    Thailand

    Alocasia hypoleuca P.C.Boyce appears in other Kew resources:

    First published in Thai Forest Bull., Bot. 36: 9 (2008)

    Accepted by

    • Boyce, P.C., Sookchaloem, D., Hetterscheid, W.L.A., Gusman, G., Jacobsen, N., Idei, T. & Nguyen, V.D. (2012). Flora of Thailand 11(2): 101-325. The Forest Herbarium, National Park, Wildlife and Plant Conservation Department, Bangkok.
    • Govaerts, R.H.A. (2011). World checklist of selected plant families published update Facilitated by the Trustees of the Royal Botanic Gardens, Kew.

    Literature

    CATE Araceae
    • Boyce, P.C. 2008. A review of Alocasia (Araceae: Colocasieae) for Thailand including a novel species and new species records from South-West Thailand. Thai For. Bull. (Bot.), 36, 1-17.

    Sources

    CATE Araceae
    Haigh, A., Clark, B., Reynolds, L., Mayo, S.J., Croat, T.B., Lay, L., Boyce, P.C., Mora, M., Bogner, J., Sellaro, M., Wong, S.Y., Kostelac, C., Grayum, M.H., Keating, R.C., Ruckert, G., Naylor, M.F. and Hay, A., CATE Araceae, 17 Dec 2011.
    http://creativecommons.org/licenses/by-nc-sa/3.0

    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