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Taiwan Gramineae | Family List | Poaceae

Oplismenus P. Beauv.


Oplismenus compositus

Credit: CC Hsu

Annuals or perennials; culms often trailing, creeping near base, forming mats in shady habitats. Inflorescence of racemosely arranged racemes; racemes distant, solitary, secund, spreading or slanting, simple or somewhat compound, sometimes very short, with a few spikelets or only one, in latter case inflorescence resembnling a thin spike; axis keeled on abaxial side; branches and pairs of spikelets alternate along keels. Spikelets secund, usually in pairs, one spikelet often poorly developed and small; spikelets articulate with a short pedicel, oblong, 2-flowered; rachilla articulate at base of upper lemma; glumes and lower lemma herbaceous; glumes 5-7-veined, awned just below apex, shorter than spikelet, or upper glume as long; lower glume with longest awn, abaxial; upper lemma small, smooth and glossy, glabrous, 5-veined, with opaque inrolled margins embracing upper palea; upper palea as long and of same texture, with broadly incurved margins, 2-veined; lodicules 2, small; stamens 3, anthers linear; ovary oblong, attenuate, with 2 short, distant styles, stigma narrowly plumose, exserted apically. Caryopsis wholly enclosed but free from indurate upper palea and upper lemma.

Nine species, in the tropical and subtropical regions of the world. Three species in Taiwan.

1 Inflorescence of groups of fasicicled spikelets alternate along axis; lower lemma usually shortly aristate   Oplismenus hirtellus
+ Inflorescence racemose; lower lemma not aristate, rarely pointed.   (2)
2 (1) Spikelets densely crowded   Oplismenus aemulus
+ Spikelets rather far apart on rachis   Oplismenus compositus

Lower Taxa

Related Synonym(s):


Related Objects  

Flora of China  
  • Oplismenus.pdf
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