杂交披碱草 za jiao pi jian cao

Basionym: Roegneria hybrida Keng, Acta Univ. Nankin. Sci. Nat. 1963(1): 18. 1963; R. tsukushiensis (Honda) B. Rong Lu et al. var. hybrida (Keng) L. B. Cai.

Culms erect or decumbent at base, ca. 90 cm tall. Leaf sheath brown or purplish; leaf blade flat, 15–25 × (0.25–)0.5–0.8 cm. Spike nodding, ca. 27 cm. Spikelets 1 per node, green, 17–20 mm excluding awns, with 6–8 florets. Glumes oblong-lanceolate, scabrous along veins, margin membranous, apex acuminate or with awn 1–2.5 mm; proximal glume 6–8 mm, 3–5-veined; distal glume 8–9 mm, 5–7-veined. Lemma oblong-lanceolate, proximal and distal parts hirsutulous but middle part subsmooth, long ciliate near margin, margin broadly scarious; awn erect or reflexed, 20–30 mm, scabrous. Palea slightly shorter than or equaling lemma, winged along keels, ciliolate along distal 3/4 of wings, apex obtuse. Ovary apex with yellowish, hard hairs. Fl. and fr. May–Jul.

* Mountain slopes. Jiangsu (Nanjing).

Chen (Bull. Nanjing Bot. Gard. 1987: 9. 1988) did not previously validly publish the combination Elymus hybridus because the place of valid publication of the basionym was not cited (Saint Louis Code, Art. 33.3). Instead, Roegneria hybrida was cited from Keng (Fl. Ill. Pl. Prim. Sin. Gram. 352. 1959), where the name was not validly published because no Latin description was provided (Art. 36.1).