齿披碱草 chi pi jian cao

Agropyron ugamicum Drobow in Vvedensky et al., Key Fl. Tashkent 1: 40. 1923, not Elymus ugamicus Drobow (loc. cit. 44. 1923); E. dentatus (J. D. Hooker) Tzvelev subsp. ugamicus (Drobow) Tzvelev; E. gmelinii (Ledebour) Tzvelev subsp. ugamicus (Drobow) A. Löve; Goulardia ugamica (Drobow) Ikonnikov; Roegneria ugamica (Drobow) Nevski; Semei-ostachys ugamica (Drobow) Drobow.

Culms geniculate at base, robust, 50–120 cm tall. Leaf sheath glabrous or proximally pilose; leaf blade flat, 0.7–1.1 cm wide, both surfaces pilose and scabrous or abaxial surface glabrous. Spike erect, secund, dense; rachis margin scabrous. Spikelets 1 per node, greenish or tinged purplish, 20–30 mm, with 5–9 florets. Glumes broadly lanceolate, subequal, 12–15 × 2.5–4 mm, prominently (5–)7–9-veined, scabrous, margin hyaline, apex acuminate, often 1-toothed. Lemma lanceolate, 11–13 mm, hirsute, scabrous; awn moderately stout, 1–5(–7) mm. Palea subequaling lemma, 10–12 mm, hispid along keels, apex rounded-obtuse. Anthers 2.5–3 mm. Fl. and fr. Jul–Aug. 2n = 28.

Mountain slopes, valleys. Xinjiang [Kazakhstan, Kyrgyzstan, Russia, Turkmenistan, Uzbekistan].

This species has been treated as conspecific with Elymus dentatus (J. D. Hooker) Tzvelev (Spisok Rast. Gerb. Fl. SSSR Bot. Inst. Vsesoyuzn. Akad. Nauk 18: 29. 1970; Agropyron dentatum J. D. Hooker, Fl. Brit. India 7: 370. 1896 ["1897"]; Roegneria dentata (J. D. Hooker) Nevski; Semeiostachys dentata (J. D. Hooker) Drobow), which is regarded here as endemic to Kashmir and Pakistan. If the two species are united then the name E. dentatus has priority.