Deyeuxia breweri

HABIT Perennial; caespitose. Culms 15–30 cm long. Lateral branches lacking. Leaves mostly basal. Ligule an eciliate membrane; 0.5–1.5 mm long; obtuse. Leaf-blades filiform; conduplicate, or involute; 0.5–1 mm wide.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 3–8 cm long. Primary panicle branches spreading; 1–2 cm long.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.3–4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.5 mm long; 0.15 length of lemma.

GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acuminate. Upper glume lanceolate; 3.3–4 mm long; 1 length of adjacent fertile lemma; membranous; purple; 1-keeled; 1–3 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 3–4 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.1–0.2 way up back of lemma; geniculate; 5–6 mm long overall; with twisted column. Palea 1 length of lemma. Rhachilla extension 0.33 length of fertile floret; pilose.

FLOWER Lodicules 2; 0.7 mm long. Anthers 3; 1.3 mm long. Stigmas 2.

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

DISTRIBUTION North America: southwest USA.

NOTES Aveneae. Fl Pac NW 1994.

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