Deyeuxia scopulorum

HABIT Perennial; caespitose; clumped densely. Culms 40–80 cm long. Culm-internodes smooth. Lateral branches lacking. Leaf-sheaths antrorsely scabrous. Ligule an eciliate membrane; 3–8 mm long; erose, or lacerate; obtuse. Collar glabrous. Leaf-blades erect; 3–7 mm wide; stiff. Leaf-blade surface scabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 4–15 cm long; 1–1.5 cm wide.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.5–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 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 surface asperulous. Lower glume apex acuminate. Upper glume lanceolate; 4.5–5.5 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled; 1–3 -veined. Upper glume surface asperulous. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 4–5 mm long; membranous; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; straight; 2–2.5 mm long overall; not or scarcely exserted from spikelet. Palea 1 length of lemma. Rhachilla extension 0.5 length of fertile floret; pilose.

FLOWER Lodicules 2; 0.8 mm long. Anthers 3; 2.5–3 mm long. Stigmas 2.

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

DISTRIBUTION North America: northwest USA, southwest USA, and south-central USA.

NOTES Aveneae. Fl Pac NW 1994.

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