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FOC | Family List | FOC Vol. 22 | Poaceae

89. Polypogon Desfontaines, Fl. Atlant. 1: 66. 1798.

棒头草属 bang tou cao shu

Authors: Sheng-lian Lu & Sylvia M. Phillips

Annual or perennial. Leaf blades linear, flat; ligule membranous. Panicle contracted to dense and spikelike, often bristly with numerous small deciduous spikelets. Spikelets with 1 floret, laterally compressed, without rachilla extension, falling entire, pedicel or upper part of it articulated and remaining attached to spikelet as a stipe; glumes equal, longer than floret, papery, scabrid, 1-veined, apex entire to 2-lobed, often with slender awn from apex; lemma about 1/2 as long as glumes, rounded, thin, smooth, shiny, obscurely 5-veined, veins usually shortly excurrent from truncate apex, awnless or with fine subapical awnlet or geniculate dorsal awn; palea 1/2 as long to equaling lemma. Stamens 1–3.

Twenty-five species:warm-temperate regions of the world and on tropical mountains, especially in damp places; six species (one endemic) in China.

Polypogon is closely related to Agrostis, with which it hybridizes. It is distinguished mainly by its deciduous spikelets falling with a slender, basal stipe attached.

1 Glumes awnless   (2)
+ Glumes awned   (3)
2 (1) Spikelets 1.5–2.5 mm; palea almost as long as lemma; anthers 0.5–0.7 mm.   1 P. viridis
+ Spikelets 3–4 mm; palea 2/3 lemma length; anthers 1–1.5 mm.   2 P. hissaricus
3 (1) Awn of glumes shorter than or up to 1.5 times as long as glume body   (4)
+ Awn of glumes 2.5–4 times as long as glume body   (5)
4 (3) Panicle very dense; spikelet stalks short, the longest articulated much above their base; palea almost as long as lemma.   3 P. fugax
+ Panicle lax; spikelet stalks long, all articulated only at their base; palea 2/3 lemma length.   4 P. ivanovae
5 (3) Glumes emarginate; lemma with 1.5–2 mm awn.   5 P. monspeliensis
+ Glumes deeply 2-lobed; lemma awnless.   6 P. maritimus

Lower Taxa


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