1. Family: Araceae Juss.
    1. Spathantheum Schott

      1. This genus is accepted, and its native range is Peru to N. Argentina.

    [CATE]

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

    Habitat
    Tropical and subtropical uplands, mountain grasslands, up to 2400m; geophytes on stony ground in shade, in deposits of humus on rocks.
    General Description
    HABIT : medium-sized, seasonally dormant herbs, tuber depressed-globose, sometimes large. LEAVES : solitary. PETIOLE : sheath very short. BLADE : outline ovate to ovate-cordate, entire or pinnatifid; primary lateral veins pinnate, running into margin, higher order venation reticulate. INFLORESCENCE : usually 1, rarely 2 in each floral sympodium, flowering before leaf. PEDUNCLE : short ( S. intermedium) to long ( S. orbignyanum), slender. SPATHE : oblong-elliptic, boat-shaped, not constricted, cuspidate, at first convolute basally, then widely gaping at anthesis, green or purple ( S. intermedium), entirely persistent. SPADIX : entirely adnate to spathe ( S. orbignyanum) or male part free ( S. intermedium), slightly shorter than spathe, densely flowered, either female zone basal, contiguous with longer male zone and spadix fertile to apex ( S. intermedium, S. orbignyanum), or female and male zones sometimes separated by a zone of mixed male and female flowers ( S. orbignyanum). FLOWERS : unisexual, perigone absent. MALE FLOWER : 4-7-androus, stamens either connate into a long-stipitate, apically convex, peltate and shallowly 5-7-lobed (stigmatoid) synandrium with anthers almost pendent from thickened common connective, or filaments connate, anthers free and stigmatoids elongated, overtopping anthers ( S. intermedium), thecae linear-oblong and dehiscing by longitudinal slit ( S. orbignyanum) or subglobose and dehiscing by apical pore ( S. intermedium). POLLEN : inaperturate, ellipsoid-oblong, large (mean 54 µm.), exine nearly psilate or shallowly uneven. FEMALE FLOWER : gynoecium surrounded by whorl of 5-8 terete-clavate, short staminodes, ovary ovoid-ellipsoid, 5-8-locular, ovules 1 per locule, suborthotropous, funicle distinct, placenta axile at base of septum, style elongate-attenuate, stigma stellate, 6-8-lobed, lobes subtriangular. BERRY : subglobose to depressed-globose, 5-8-seeded. SEED : shortly ovoid to ± ellipsoid, testa ± smooth to slightly roughened, embryo elongate, endosperm copious.
    Diagnostic
    Seasonally dormant tuberous geophytes; leaf solitary; leaf blade cordate to pinnatifid, submarginal collective veins absent, fine venation reticulate; spadix entirely adnate to the spathe; flowers unisexual, perigone absent; male flower a stalked synandrium; female flowers surrounded by a whorl of free staminodes. Differs from Spathicarpa in 6-8-locular ovary and pinnatifid leaf blade.
    Distribution
    Peru to N. Argentina.

    Images

    Distribution

    Native to:

    Argentina Northwest, Bolivia, Peru

    Spathantheum Schott appears in other Kew resources:

    First published in Bonplandia (Hannover) 7: 164 (1859)

    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