Deyeuxia bolanderi

HABIT Perennial. Rhizomes elongated. Culms erect; 100–150 cm long. Culm-internodes smooth, or scaberulous. Leaves cauline. Leaf-sheaths scaberulous; glabrous on surface. Ligule an eciliate membrane; 4–5 mm long; scaberulous on abaxial surface. Leaf-blades 5–20 cm long; 5–9 mm wide. Leaf-blade surface smooth.

INFLORESCENCE Inflorescence a panicle.

Panicle open; pyramidal; 10–20 cm long. Primary panicle branches spreading; whorled at most nodes; 5–10 cm long. Panicle axis smooth. 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; 3–4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.

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 scabrous. Lower glume apex acute. Upper glume lanceolate; 3–4 mm long; 1 length of adjacent fertile lemma; membranous; purple; 1-keeled; 1 -veined. Upper glume surface scabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3–4 mm long; membranous; without keel; 5 -veined. Lemma surface scabrous. Lemma apex awned; 1 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; geniculate; 3 mm long overall; clearly exserted from spikelet; with twisted column. Rhachilla extension 1–2 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.