Deyeuxia tzvelevii

HABIT Perennial; caespitose; clumped densely. Culms erect; 130–160 cm long. Culm-internodes distally glabrous. Leaf-sheaths smooth. Ligule an eciliate membrane; 3–5 mm long; entire. Leaf-blades 3–6 mm wide.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; lanceolate; 14–17 cm long. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.66 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 1.6–1.7 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 3–3.5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins distinct. Lemma surface asperulous. Lemma apex erose; awned; 1 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; geniculate; 5–5.5 mm long overall; with a straight or slightly twisted column. Rhachilla extension 1 mm long; pilose; with 2–2.5 mm long hairs.

FLOWER Anthers 3; 2 mm long; yellow.

DISTRIBUTION Asia-temperate: Caucasus.

NOTES Aveneae. Gussejnov 2006.

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