Amydrium Schott
  • Ann. Mus. Bot. Lugduno-Batavi 1: 127 (1863) 


Notes: Distribution: Indo-China to Papua New Guinea

General Description

Trichosclereids sparsely present in vegetative parts (Seubert, pers. comm.), more abundant in style (Carvell 1989). HABIT : evergreen herbs, often very robust, stem climbing or prostrate, usually producing long flagellae with reduced cataphylls. LEAVES : many, often remote from one another. PETIOLE : geniculate apically, sheath usually less than half as long as petiole. BLADE : ovate-cordate or pandurate-trilobed or pinnatisect, sometimes with ± numerous round to oval perforations near midrib; primary lateral veins pinnate, running into marginal vein, higher order venation reticulate. INFLORESCENCE : 1-several in each floral sympodium. PEDUNCLE : erect, subequal or half as long as petiole. SPATHE : conchiform to ovate, apiculate, sometimes reflexed at anthesis and then deciduous. SPADIX : sessile to long-stipitate, sometimes very short. FLOWERS : bisexual, perigone absent. STAMENS : 4, filaments short, broadly linear, anthers equalling or shorter than filaments, thecae ovoid, extrorse, dehiscing by longitudinal slit. POLLEN : fully zonate, hamburger-shaped, medium-sized (mean 39 µm., range 38-41 µm.), exine either densely and minutely punctate in one half and virtually psilate in other, or uniformly foveolate-fossulate, apertural exine psilate or obscurely verrucate. GYNOECIUM : obpyramidal or obconoid, tetragonal, ovary 1-locular, ovules 2, anatropous, funicle short, placenta near base of deeply intrusive septum, style broader than ovary, slightly prominent centrally below stigma, otherwise ± truncate, stigma small, hemispheric. BERRY : subglobose, truncate to domed at apex, white (A. medium, A. humile) or orange-red (A. magnificum, A. zippelianum) when ripe. SEED : subglobose to heart-shaped, testa smooth, glossy, embryo curved and partly green, endosperm present (E. Seubert 1993).

Diagnostic Description

Climbing hemiepiphytes on tree trunks or creeping on forest floor; trichosclereids only sparsely present in vegetative parts; higher order leaf venation completely reticulate; flowers bisexual, ovary 1-locular, placenta 1, intrusive parietal, ovules 2; seeds subglobose to heart-shaped. Notable among Monsteroid genera for the combination of reticulate fine venation and absence of perigone.

Habitat

Tropical humid forest; climbing hemiepiphytes on tree trunks or creeping on forest floor (A. humile).

Distribution Map

 
  • Native distribution
Specimens
Found in
  • Asia-Temperate China China South-Central
  • China Southeast
  • Hainan
  • Asia-Tropical Indo-China Myanmar
  • Thailand
  • Vietnam
  • Malesia Borneo
  • Jawa
  • Malaya
  • Maluku
  • Philippines
  • Sulawesi
  • Sumatera
  • Papuasia New Guinea

  Bibliography

  • 1 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.
  • 2 Govaerts, R. (1995). World Checklist of Seed Plants 1(1, 2): 1-483, 1-529. MIM, Deurne.
  • 3 Mayo, S.J., Bogner, J. & Boyce, P.C. The Genera of Araceae. (Royal Botanic Gardens Kew: 1997).

 Information From

CATE Araceae
http://araceae.e-monocot.org
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, 14 Dec 2011 . 17 Dec 2011.
  • A All Rights Reserved
Global Biodiversity Information Facility
http://data.gbif.org
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eMonocot
http://e-monocot.org
eMonocot. (2010, 1st November). Retrieved Wednesday, 8th February, 2012, from http://e-monocot.org.
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World Checklist of Selected Plant Families
http://apps.kew.org/wcsp/
WCSP 2014. 'World Checklist of Selected Plant Families. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; http://apps.kew.org/wcsp/ Retrieved 2011 onwards
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