Deyeuxia macilenta

HABIT Perennial; caespitose. Rhizomes elongated. Culms 15–40 cm long. Lateral branches lacking. Ligule an eciliate membrane; 0.5–5 mm long. Leaf-blades involute; 1–3 mm wide. Leaf-blade surface scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear, or oblong; continuous, or interrupted; 3–7 cm long; 0.5–1.5 cm wide.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.33–0.5 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; 1.3 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 3–4 mm long; membranous; without keel; 5 -veined. Lemma apex awned; 1 -awned. Principal lemma awn dorsal; arising 0.25 way up back of lemma; geniculate; 4 mm long overall; with twisted column. Rhachilla extension 1.5–2 mm long; pilose; with 2–3 mm long hairs.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

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

DISTRIBUTION Asia-temperate: Siberia, China, and Mongolia.

NOTES Aveneae. Fl USSR 1995.

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