Deyeuxia sajanensis

HABIT Perennial; caespitose; clumped densely. Rhizomes elongated. Culms erect; 30–60 cm long; 2–3 -noded. Culm-internodes smooth; distally glabrous. Lateral branches lacking. Ligule an eciliate membrane; 0.5–2.5 mm long; entire, or lacerate; truncate. Leaf-blades convolute; 2–3 mm wide; stiff. Leaf-blade surface scabrous; glabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; oblong; 5–8 cm long; 1–2 cm wide. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.9–1 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 0.75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 5–6 mm long; 1.6 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 3.1–3.6 mm long; membranous; without keel. Lemma lateral veins with distinct primaries but obscure intermediates. Lemma apex awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; straight; 2 mm long overall. Palea 0.66 length of lemma; hyaline; 2 -veined. Rhachilla extension 0.7–1 mm long; villous; with 2.5–3 mm long hairs.

FLOWER Lodicules 2; lanceolate; membranous. Anthers 3; 1.7–1.9 mm long. Stigmas 2.

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

DISTRIBUTION Asia-temperate: Siberia and Mongolia.

NOTES Aveneae. Malysch 1996.

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