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Taiwan Gramineae | Family List | Poaceae

Arthraxon P. Beauv., Ess. Agrostogr. 111, f. 11.6. 1812.

藎草屬

Arthraxon quartinianus
specimen

Credit: cs kuoh

Clums solid, erect, ascending, usually decumbent, or scrambling, Inflorescence of 2 to several, slender, spike-like racemes digitately to subdigitately arranged; racemes with slender, many-noded, articulate rachis. Spikelets in alternate, typically dimorphic pairs, one of a pair pedicelled, the other sessile; spikelets dorsiventrally arranged. Pedicelled spikelets neuter, mostly reduced to stipe, sometimes even the stipe absent. Sessile spikelets narrow, laterally compressed, shortly white-hairy at base; glumes as long as spikelet, or one slightly shorter than the other; lower glume acute or shortly 2-toothed, mostly rather firm, sometimes thinly herbaceous, granulate; upper glume acute, usually with a firm central part and membranous margins, but sometimes completely thin herbaceous; lower lemma shorter than lower glume, membranous, nerveless or 1-nerved; lower palea absent; upper lemma hyaline, strongly convex, sub-entire, with slender, geniculate awn from near the base, the column glabrous and the terminal part finely short-hairy; upper palea sometimes present, small, hyaline, nerveless; lodacules 2; stamens 2-3, free; stigmas feather-like. Caryopsis oblong, free.

About 20 species distributed in tropical Africa, Madagascar, Martitius, Indo-Malaya, China to Japan.

Three species, mainly found on forest margins, are recorded from Taiwan.


KEY TO THE SPECIES

1 Peduncles erect, stout; spikelets in 2-3, rarely in single raceme   Arthraxon pauciflorus
+ Peduncle slender; spikelets in 2 to several digitate or paniculate racemes.   (2)
       
2 (1) Spikelets 5 mm long; anthers 1.5-2 mm long   Arthraxon quartinianus
+ Spikelets 2-3 mm long; anthers less than 1 mm long   Arthraxon hispidus

Lower Taxa


 

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Flora of China  
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