Elymus petrovii

HABIT Perennial; caespitose; clumped densely. Culms erect; 80–140 cm long. Culm-internodes smooth. Ligule an eciliate membrane. Leaf-blades convolute; 2–5 mm wide. Leaf-blade surface ribbed; grooved adaxially; scabrous; rough adaxially.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; straight; bilateral. Rhachis flattened. Spikelet packing broadside to rhachis; crowded; regular; 2 -rowed.

Spikelets in pairs. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes scaberulous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 7–9 mm long; 1 length of upper glume; coriaceous; without keels; 3(–5) -veined. Lower glume surface scabrous. Lower glume apex acuminate; awned. Lower glume awn 2 mm long. Upper glume lanceolate; 7–10 mm long; 7–9 length of adjacent fertile lemma; 1 length of spikelet; coriaceous; without keels; 3(–5) -veined. Upper glume surface scabrous. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 2 mm long.

FLORETS Fertile lemma lanceolate to oblong; 7–9 mm long; coriaceous; without keel; 5 -veined. Lemma surface scabrous. Lemma apex acute; awned; 1 -awned. Principal lemma awn 3–6 mm long overall. Palea 1 length of lemma; 2 -veined. Palea keels scabrous. Palea surface scaberulous. Apical sterile florets resembling fertile though underdeveloped.

DISTRIBUTION Asia-temperate: China.

NOTES Triticeae. Tzvelev 2011.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.