山东披碱草 shan dong pi jian cao

Roegneria shandongensis (B. Salomon) J. L. Yang et al.

Culms laxly tufted, erect or slightly decumbent at base, 60–90 cm tall. Leaf sheath usually glabrous; ligule ca. 6.5 mm; leaf blade flat or involute at margin, 10–25 × 0.4–0.8 cm, both surfaces scabrous or adaxial surface smooth. Spike erect or slightly curved, 8–20 cm. Spikelets 1 per node, 13–19 mm excluding awns, with 5–8 florets. Glumes oblong-lanceolate, 5–7-veined, apex acute or pointed; veins robust, scabrous; proximal glume 5–7 mm; distal glume 7–9 mm. Lemma oblong-lanceolate, subglabrous abaxially, margin membranous; first lemma 9–10 mm; callus pubescent along lateral side; awn erect, (12–) 20–30 mm, scabrous. Palea subequaling lemma, wingless and shortly setiform ciliate along keels. Fl. and fr. Jul–Aug. 2n = 28*.

* Mountain slopes, roadsides. Anhui, Guizhou, Henan, Hubei, Jiangsu, Shaanxi, Shandong, Taiwan, Zhejiang.

This species has long been misclassified by some taxonomists in China as Elymus ×mayebaranus (Honda) S. L. Chen (Agropyron ×may-ebaranum Honda; Roegneria ×mayebarana (Honda) Ohwi ex Keng & S. L. Chen). The true E. ×mayebaranus is found only in Japan; it is a highly sterile natural hybrid between the hexaploid (2n = 42) parents E. humidus (Ohwi & Sakamoto) A. Löve (A. humidum Ohwi & Sakamoto) and E. tsukushiensis Honda.