Deyeuxia tianschanica

HABIT Perennial; caespitose; clumped densely. Rhizomes short. Culms erect; 10–50 cm long. Culm-internodes distally glabrous. Lateral branches lacking. Ligule an eciliate membrane; 2–3 mm long; obtuse. Leaf-blades flat, or involute; 2–3 mm wide. Leaf-blade surface scabrous; rough adaxially.

INFLORESCENCE Inflorescence a panicle. Peduncle antrorsely scabrous above.

Panicle spiciform; linear; interrupted; 1.5–7 cm long.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 2 mm long; 0.5–0.66 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 3.5–6 mm long; 1–1.3 length of adjacent fertile lemma; membranous; purple; 1-keeled; 3 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 3.5–4.5 mm long; membranous; without keel. Lemma apex erose; awned; 1 -awned. Principal lemma awn dorsal; arising 0.33–0.5 way up back of lemma; geniculate; 4–5 mm long overall; with twisted column. Palea hyaline; 2 -veined. Rhachilla extension 2–2.5 mm long; villous; with 3–4 mm long hairs.

FLOWER Lodicules 2; lanceolate; membranous. Anthers 3; 1.5–2.5 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.

DISTRIBUTION Asia-temperate: Soviet Middle Asia and China.

NOTES Aveneae. Fl USSR 1996.

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