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FOC | Family List | FOC Vol. 22 | Poaceae

207. Dimeria R. Brown, Prodr. 204. 1810.

觿茅属 xi mao shu

Authors: Shou-liang Chen & Sylvia M. Phillips

Didactylon Zollinger & Moritzi; Haplachne Presl; Psilostachys Steudel; Pterygostachyum Nees ex Steudel.

Annual or perennial. Culms often delicate, erect to decumbent, nodes bearded, the hairs directed upward. Leaf blades linear; ligule short, membranous. Inflorescence terminal, composed of solitary or subdigitate racemes. Racemes 1-sided, spikelets single, shortly pedicelled, usually overlapping in 2 rows; rachis tough, triquetrous or flattened, spikelets disarticulating from pedicels at maturity; pedicels very short, broad, apex concave, margin truncate. Spikelets lanceolate or narrowly oblong, strongly laterally compressed; callus truncate, shortly bearded; glumes herbaceous or thinly papery, folded with a median keel, keel often winged, lower glume narrower and slightly shorter than upper glume; lower floret reduced to a narrow hyaline lemma; upper floret bisexual, lemma hyaline, a little shorter than upper glume, apex shortly 2-toothed, awned from sinus; awn geniculate, sometimes weakly or almost straight, glabrous; upper palea normally absent. Stamens 2. Caryopsis narrowly oblong, laterally compressed.

About 40 species: India, China, and Japan to Indonesia, the Philippines, and Australia; six species (three endemic) in China.

1 Raceme with triquetrous rachis   (2)
+ Raceme with flattened rachis   (3)
2 (1) Awn 0.5–2.5 mm; raceme rachis smooth on angles.   2 D. parva
+ Awn 6–11 mm; raceme rachis scabrid on angles.   1 D. ornithopoda
3 (1) Perennial; racemes (1–)2–3; rachis usually glabrous along margins   (4)
+ Annual; raceme solitary; rachis densely ciliate along margins   (5)
4 (3) Anthers 1.7–2 mm; upper glume obscurely keeled except below apex, or if keeled throughout, wing narrow.   3 D. falcata
+ Anthers ca. 0.8 mm; upper glume distinctly keeled and broadly winged from base to apex.   4 D. guangxiensis
5 (3) Upper glume broadly winged from base to apex.   5 D. sinensis
+ Upper glume narrowly winged only in upper 1/3.   6 D. solitaria

Lower Taxa


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