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196. Apocopis Nees, Proc. Linn. Soc. London. 1: 93. 1841.

楔颖草属 xie ying cao shu

Authors: Shou-liang Chen & Sylvia M. Phillips

Amblyachyrum Hochstetter ex Steudel.

Annual or perennial. Culms slender. Leaf blades linear; ligule short, membranous. Inflorescence terminal, composed of (1 or)2(–4) erect, closely appressed racemes; racemes fragile, spikelets imbricate, usually single, sessile spikelets present, pedicelled spikelets normally suppressed, sometimes a few basal spikelets enlarged, barren, awnless; rachis internodes shorter than spikelets, linear, ciliate; pedicels slender, partly adnate to margin of lower glume, occasionally bearing a rudimentary spikelet (developed in A. intermedius). Sessile spikelet dorsally compressed, florets 2; callus obtuse; lower glume papery to leathery, broad, flattened, 7(–9)-veined, apex broadly truncate or emarginate; upper glume narrowly lanceolate, 3-veined, 2-keeled, margins inflexed; lower floret staminate, lower lemma and palea similar, hyaline; upper floret variable, female, bisexual, male or barren, upper lemma linear-lanceolate, entire or 2-toothed, with geniculate puberulous awn, infrequently awnless, palea shorter and broader. Lodicules absent. Stamens 2.

Fifteen species: tropical Asia; four species (one endemic) in China.


1 Lower glume dark brown with pale yellowish transverse apical band; awn usually absent.   1 A. paleaceus
+ Lower glume pale greenish yellow with dark red transverse apical band; awn present   (2)
       
2 (1) Sessile spikelet 6–9 mm, upper floret male or barren; pedicelled spikelet present, female, awned.   4 A. intermedius
+ Sessile spikelet 3.5–6 mm, upper floret bisexual; pedicelled spikelet absent   (3)
       
3 (2) Sessile spikelet 3.5–4 mm; lower glume papery, obovate-cuneate.   2 A. breviglumis
+ Sessile spikelet 4.5–6 mm; lower glume herbaceous, obovate.   3 A. wrightii

Lower Taxa


 

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