Deyeuxia dmitrievae

HABIT Perennial; caespitose; clumped loosely. Cataphylls evident. Culms geniculately ascending; 40–80 cm long. Ligule an eciliate membrane. Collar glabrous. Leaf-blades flat, or convolute; 2–6 mm wide; light green and mid-green; discolorous with last colour beneath. Leaf-blade surface scaberulous; rough abaxially; glabrous, or pilose; sparsely hairy; hairy adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 6–18 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; 4.5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 1.7–2 mm long; 0.5 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 4.5–6 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined, or 3 -veined. Lower glume lateral veins absent, or obscure. Lower glume apex acute. Upper glume lanceolate; 4.5–6 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 4 mm long; membranous; without keel; 5 -veined. Lemma lateral veins excurrent. Lemma apex dentate; 2 -fid, or 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.33 way up back of lemma; geniculate; 7–8 mm long overall; with a straight or slightly twisted column. Rhachilla extension pilose.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

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

DISTRIBUTION Asia-temperate: Caucasus.

NOTES Aveneae. Tsvelev 2001.

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