Ariopsis Nimmo
  • J.Graham, Cat. Pl. Bombay: 252 (1839) 

Notes: Distribution: India, Himalaya to N. Thailand

General Description

Laticifers simple, articulated. HABIT : small, seasonally dormant herbs, tuber ± subglobose, hypogeal. LEAVES : usually solitary, rarely few. PETIOLE : slender, sheath fairly short. BLADE : peltate, cordate-ovate or only emarginate basally, thin, glaucous below, posterior lobes very short; primary lateral veins pinnate and also radiating from petiole insertion, forming submarginal collective vein, marginal vein also present, higher order venation reticulate. INFLORESCENCE : 1-3 in each floral sympodium, appearing with or without leaves. PEDUNCLE : very slender, much longer than spathe, erect. SPATHE : ovate, boat-shaped, fornicate, not constricted, gaping widely, not convolute at base, marcescent. SPADIX : shorter than spathe, female zone adnate to spathe, very short and few-flowered, separated from male zone by short, free, naked axis, male zone fertile to apex, relatively thick, cylindric-conoid, many-flowered. FLOWERS : unisexual, perigone absent. MALE FLOWER : synandrium peltate, connate filaments forming a stipe longer and narrower than dilated common connective, thecae subglobose to ellipsoid, dehiscing by oval pore, synandria all connate apically, forming continuous surface punctured by cavities with somewhat prominent margins into which pollen is shed from the 6(-8) surrounding thecae (each pair of thecae belonging to a different synandrium). POLLEN : inaperturate, spherical or subspheroidal, small (mean 20 µm.), exine spinose. FEMALE FLOWER : ovary oblong, 1-locular, ovules many, orthotropous, placentae 4-6, parietal, extending from base to apex of locule, style absent, stigma stellate with 4-6-laciniate lobes, lobes initially erect, later spreading and reflexed. BERRY : 4-6-angled, stigma persistent, many-seeded. SEED : oblong, apically narrowed and obtuse, with indistinct strophiole, testa thickish, longitudinally costate, embryo axile, small, endosperm copious.

Diagnostic Description

Small geophyte with subglobose tuber; leaves solitary or few, peltate, with reticulate fine venation and submarginal collective vein; spathe simple, ovate, gaping widely, flowers unisexual, perigone absent; synandria connate, thecae of adjacent synandria encircling pits in the spadix, each pit with a somewhat prominent upper margin.


Tropical evergreen forest; geophytes on forest floor or in rock crevices.


India, Himalaya to Myanmar.

Distribution Map

  • Native distribution
Found in
  • Asia-Tropical Indian Subcontinent Assam
  • Bangladesh
  • East Himalaya
  • India
  • Nepal
  • Indo-China Myanmar
  • Thailand


  • 1 Boyce, P.C. (2009). Ariopsis (Araceae: Colocasieae) a new generic record for Thailand & preliminary observations on trans-Himalayan biogeography in Araceae. Thai Forest Bulletin (Botany) 37: 9-14.
  • 2 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.
  • 3 Govaerts, R. (1995). World Checklist of Seed Plants 1(1, 2): 1-483, 1-529. MIM, Deurne.
  • 4 Gardens, K.""Royal Bot World Checklist of Selected Plant Families. (2008).
  • 5 Mayo, S.J., Bogner, J. & Boyce, P.C. The Genera of Araceae. (Royal Botanic Gardens Kew: 1997).

 Information From

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, 14 Dec 2011 . 17 Dec 2011.
  • A All Rights Reserved
eMonocot. (2010, 1st November). Retrieved Wednesday, 8th February, 2012, from
  • B Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
World Checklist of Selected Plant Families
WCSP 2014. 'World Checklist of Selected Plant Families. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; Retrieved 2011 onwards
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