Deyeuxia foliosa

HABIT Perennial; caespitose. Culms erect, or geniculately ascending; 30–60 cm long. Culm-internodes scaberulous. Leaves mostly basal. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 2–4 mm long. Leaf-blades involute; 20–50 cm long; 1–2 mm wide. Leaf-blade surface smooth.

INFLORESCENCE Inflorescence a panicle. Peduncle scaberulous above.

Panicle contracted, or spiciform; linear; continuous, or interrupted; 5–12 cm long. Primary panicle branches appressed. Panicle axis scaberulous. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 10 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 3 mm long; 0.5–0.66 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; 10 mm long; 1.8 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 5–7 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; geniculate; 9–10 mm long overall; clearly exserted from spikelet; with twisted column. Rhachilla extension 4–6 mm long; pilose.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

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

DISTRIBUTION North America: southwest USA.

NOTES Aveneae. N Amer Fl 1994.

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