糙颖剪股颖 cao ying jian gu ying

Agrostis lutosa Poiret, Encycl., Suppl. 1: 249. 1810, based on A. littoralis Withering, Arr. Brit. Pl., ed. 3, 2: 129. 1796, not Lamarck (1791); ×Agropogon littoralis C. E. Hubbard, nom. illeg. superfl.; Agrostis subaristata Aitchison & Hemsley; Polypogon littoralis Smith, nom. illeg. superfl.; P. lutosus (Poiret) Hitchcock; P. subaristatus (Aitchison & Hemsley) Bhattacharya & S. K. Jain; Vilfa lutosa (Poiret) P. Beauvois.

Perennial, often shortly stoloniferous. Culms solitary or loosely tufted, ascending or decumbent and rooting at lower nodes, up to 80 cm tall.Leaf sheaths loose, glabrous; leaf blades linear, 9–20 cm, 2–10 mm wide, scabrid along margins and veins, apex acute or acuminate; ligule 5–8 mm, scarious, scabrid on back, lacerate at apex. Panicle densely contracted, lanceolate to oblong in outline, lobed, 2–18 cm; branches subverticillate; pedicels pubescent. Spikelets 2–3 mm, disarticulating above glumes; glumes persistent, subequal or upper glume slightly shorter than lower, elliptic, hispidulous, apex acute or emarginate with awn to 0.5(–3) mm; callus glabrous; lemma oblong, 1.4–1.6 mm, firmly hyaline, glossy, 5-veined, apex truncate-denticulate, awnless or with subapical awn up to 3 mm; palea 2/3 length of lemma. Anthers 0.5–1 mm, indehiscent. Fl. Jun–Jul.

Moist and saline ground; 1000–3000 m. S Gansu, Sichuan, Xizang, Yunnan [Afghanistan, NW India, Pakistan; NE Africa, Europe].

This is the name given to hybrids between Agrostis stolonifera and Polypogon monspeliensis. The spikelets resemble Polypogon in their scabrid, often shortly awned glumes, but these lack clearly 2-lobed tips, whereas spikelet disarticulation is usually like Agrostis. The plants are infertile, producing neither good pollen nor ripe seed.

The name ×Agropogon littoralis, based on Polypogon littoralis (1816), in turn a nomen novum for Agrostis littoralis Withering, has frequently been used in the literature. However, A. lutosa (1810), also a nomen novum for A. littoralis, is the earliest legitimate name and provides the correct specific epithet. Therefore both P. littoralis and ×A. littoralis were nomenclaturally superfluous when published and are consequently illegitimate.