Deyeuxia flavens

HABIT Perennial. Culms erect, or geniculately ascending; 30–40 cm long; 2 mm diam.; 2 -noded. Culm-internodes elliptical in section. Lateral branches lacking. Leaf-sheaths loose; glabrous on surface. Ligule an eciliate membrane; 4–6 mm long; truncate, or obtuse. Leaf-blades 4–12 cm long; 2–5 mm wide. Leaf-blade surface scaberulous.

INFLORESCENCE Inflorescence a panicle; embraced at base by subtending leaf.

Panicle open; ovate; 12 cm long. Primary panicle branches ascending. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5.5–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.25–0.33 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 5.5–7 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 5.5–7 mm long; 1.2–1.6 length of adjacent fertile lemma; membranous; 1-keeled; (1–)3 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent, or obscure. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; 4.5 mm long; membranous; without keel; 5 -veined. Lemma apex awned; 1 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; geniculate; 6–7 mm long overall; with twisted column. Palea 2 -veined. Rhachilla extension 1 mm long; pilose; with 2 mm long hairs.

FLOWER Lodicules 2. Anthers 3; 1 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-temperate: China.

NOTES Aveneae. Keng 1996.

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