Araceae

Phymatarum M.Hotta

First published in Mem. Coll. Sci. Kyoto Imp. Univ., Ser. B, Biol. 32: 29 (1965)
This genus is accepted
The native range of this genus is Borneo.

Descriptions

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

Distribution
Borneo.
General Description
HABIT : small evergreen herbs, stem creeping to decumbent. LEAVES : several. PETIOLE : sheath fairly short with long marcescent ligule. BLADE : narrowly elliptic, somewhat coriaceous, apex with tubular mucro; primary lateral veins pinnate, running into conspicuous marginal vein, secondary and tertiary laterals parallel-pinnate, higher order venation inconspicuously transverse-reticulate. INFLORESCENCE : solitary. PEDUNCLE : erect, shorter or subequal to petiole. SPATHE : constricted between tube and blade, tube convolute, persistent, green, blade longer, boat-shaped and gaping at anthesis, whitish, cuspidate, caducous after anthesis. SPADIX : extreme base bearing a few sterile flowers or not, female zone conoid to subcylindric, basally adnate to spathe, separated from male zone by cylindric to ellipsoid zone of sterile male flowers, male zone very short and slightly narrower, appendix much longer, elongate-conoid, bearing sterile male flowers. FLOWERS : unisexual, perigone absent. MALE FLOWER : apparently 1-androus, free, filament short, connective inconspicuous, thecae tuberculate, ending in curved horn, dehiscing by apical pore. STERILE FLOWERS : subprismatic, tuberculate, flattened or excavated, lowermost either with or without central, short, subulate projection, uppermost more slender, relatively longer, otherwise similar but never with projections. POLLEN : inaperturate, ellipsoid, small (mean 19 µm., range 17-22 µm.) exine psilate. FEMALE FLOWER : gynoecium depressed-globose, ovary 1-locular, ovules many, hemiorthotropous, funicle long, placenta basal, stigma sessile, slightly concave centrally, much narrower than ovary, very thinly discoid. BERRY : many-seeded, depressed-obovoid, slightly furrowed, greenish-white. SEED : ellipsoid, with long micropylar appendage, testa costate, embryo elongate, straight, endosperm copious.
Habitat
Tropical humid forest; rheophytes.
Diagnostic
Small rheophytes, stem creeping or decumbent; petiole sheath with a long marcescent ligule; leaf blade apex with tubular mucro; spathe blade falling after anthesis; flowers unisexual, perigone absent; thecae of each anther with horn- or needle-like projections. Differs from Bucephalandra and Aridarum in constricted spathe. Further differs from Bucephalandra in densely tuberculate male flowers and subprismatic (not broad and flattened) sterile flowers between male and female flowers . Differs from Aridarum in stigma smaller than ovary, upper part of the spadix sterile with distinct appendix of hornless sterile flowers and stamens never excavated apically.
[CATE]

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

  • 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 Vascular Plants 2025. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2025. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0