Lasia Lour.
  • Fl. Cochinch.: 81 (1790) 


Notes: Distribution: Trop. & Subtrop. Asia

General Description

HABIT : clump- and colony-forming evergreen herbs, stoloniferous, stem thick, aculeate or unarmed (L. concinna), erect to decumbent, green, epigeal or submersed, internodes relatively long or short. LEAVES : several. PETIOLE : long, aculeate, weakly geniculate apically, sheath relatively short. BLADE : sagittate to hastate-sagittate when juvenile, adult blade deeply pinnatifid in anterior division, posterior divisions pedatifid, sometimes simple, adult blade rarely entire, or bipinnatifid (L. concinna), major veins aculeate on lower surface; primary lateral veins pinnate in anterior division, pedate in posterior divisions, primary lateral veins of each pinna forming submarginal collective vein in pinnatifid leaves, or running into marginal vein in simple leaves, higher order venation reticulate. INFLORESCENCE : solitary. PEDUNCLE : subequal to petiole, aculeate as petiole. SPATHE : linear, very long and narrow (L. spinosa) or broader (L. concinna), very thick and spongy, spirally twisted, marcescent or deciduous, basal part enclosing spadix, gaping at anthesis. SPADIX : shortly cylindric, obtuse, sessile. FLOWERS : bisexual, perigoniate; tepals usually 4, more rarely 6, fornicate. STAMENS : 4(-6), filaments free, broad, connective slender, thecae ellipsoid, dehiscing by longitudinal slit. POLLEN : monosulcate, ellipsoid, medium-sized (mean 27 µm.), exine reticulate, psilate along aperture margins. GYNOECIUM : ovoid to ellipsoid, ovary 1-locular, ovule 1, anatropous, funicle very short, placenta apical, stylar region well developed, shortly attenuate to cylindric, stigma discoid-hemispheric. BERRY : borne in cylindric infructescence, crowded, quadrangular, apically densely muricate to spinose or smooth, 1-seeded, green. SEED : large, compressed-obovoid, testa thin, brown, hard, somewhat rugose, embryo large, somewhat curved, endosperm present but only as a single cell layer.

Diagnostic Description

Clump-forming, evergreen helophytes; stem prickly, aerial, and scrambling to prostrate, internodes distinct, green; petiole prickly, weakly geniculate at apex; leaf blade usually pinnatifid, rarely sagittate or bipinnatifid, fine venation reticulate; spathe spirally twisted, erect, thickened, spongy, marcescent to deciduous; flowers bisexual, perigoniate, tepals free; berries shortly spiny to smooth at apex.

Habitat

Tropical humid forest; helophytes, wet places in forest, open swamps, along streams, rice fields, tidal flats.

Distribution

Trop. & Subtrop. Asia.

Distribution Map

 
  • Native distribution
Specimens
Found in
  • Asia-Temperate China China South-Central
  • China Southeast
  • Hainan
  • Tibet
  • Eastern Asia Taiwan
  • Asia-Tropical Indian Subcontinent Assam
  • Bangladesh
  • East Himalaya
  • India
  • Nepal
  • Sri Lanka
  • Indo-China Cambodia
  • Laos
  • Myanmar
  • Thailand
  • Vietnam
  • Malesia Borneo
  • Jawa
  • Malaya
  • Maluku (Doubtful)
  • Sulawesi (Doubtful)
  • 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 Gardens, K.""Royal Bot World Checklist of Selected Plant Families. (2008).
  • 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
  • B All Rights Reserved
eMonocot
http://e-monocot.org
eMonocot. (2010, 1st November). Retrieved Wednesday, 8th February, 2012, from http://e-monocot.org.
  • C Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
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
  • D See http://kew.org/about-kew/website-information/legal-notices/index.htm You may use data on these Terms and Conditions and on further condition that: The data is not used for commercial purposes; You may copy and retain data solely for scholarly, educational or research purposes; You may not publish our data, except for small extracts provided for illustrative purposes and duly acknowledged; You acknowledge the source of the data by the words "With the permission of the Trustees of the Royal Botanic Gardens, Kew" in a position which is reasonably prominent in view of your use of the data; Any other use of data or any other content from this website may only be made with our prior written agreement.