1. Family: Araceae Juss.
    1. Jasarum G.S.Bunting

      1. This genus is accepted, and its native range is N. South America.

    [CATE]

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

    Diagnostic
    Submerged evergreen aquatic with thick, upright, underground stem; leaf blade linear, somewhat bullate, fine venation reticulate; inflorescence solitary, held above water; spathe erect, constricted between tube and blade; spadix lacking appendix, male and female zones separated by zone of sterile flowers; flowers unisexual, perigone absent; male flower a truncate synandrium.
    Distribution
    N. South America.
    General Description
    HABIT : evergreen aquatic herbs, stem thick, hypogeal, upright, annulate, terete, brown outside, white inside, usually unbranched, rarely branched, roots thick, somewhat spongy. LEAVES : 6-12, dark green in all parts except whitish hypogeal lower part of petiole. PETIOLE : sheath long, fleshy. BLADE : linear, somewhat bullate, acute to cuspidate, cuneate at base, midrib pronounced; primary lateral veins pinnate, numerous, 35-60 per side, joined into submarginal collective vein, marginal vein also present, higher order venation reticulate. INFLORESCENCE : solitary, held above water level. PEDUNCLE : much longer than petiole. SPATHE : erect, constricted between tube and blade, tube convolute, persistent, blade long-acuminate, never reflexed, marcescent after anthesis and later deciduous, bronze-green outside, cream-coloured inside. SPADIX : shorter than spathe, subcylindric, basal half of female zone adnate to spathe, separated from male by zone of sterile flowers, male zone fertile to apex. FLOWERS : unisexual, perigone absent. MALE FLOWER : 3-4-androus, stamens connate into synandrium, synandrium truncate, irregularly 4-6-angled, thecae 6-8, lateral, elongate, dehiscing by apical pore. POLLEN : ellipsoid, medium-sized (mean 44 µm.), exine foveolate-reticulate. FEMALE FLOWER : ovary cylindric, 1-locular, ovules (1-)2-3(-4), anatropous, funicle distinct, placenta basal, stylar region broader than ovary, stigma discoid-hemispheric. BERRY : subovoid, tightly packed, dull maroon-green apically, stigma remains persistent, pericarp fleshy, usually 1-seeded, sometimes 2-seeded. SEED : large, obovoid, compressed when paired, testa smooth, embryo globular, large, green, plumule well-developed, raphe prominent, endosperm nearly absent.
    Habitat
    Tropical uplands; submerged aquatic in oligotrophic (blackwater) streams.

    Images

    Distribution

    Native to:

    Guyana, Venezuela

    Jasarum G.S.Bunting appears in other Kew resources:

    First published in Acta Bot. Venez. 10: 264 (1975 publ. 1977)

    Accepted by

    • Govaerts, R. & Frodin, D.G. (2002). World Checklist and Bibliography of Araceae (and Acoraceae): 1-560. The Board of Trustees of the Royal Botanic Gardens, Kew.

    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 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