Deyeuxia pringlei

HABIT Perennial; culms solitary, or caespitose. Rhizomes elongated. Culms erect; 50–90 cm long. Culm-internodes smooth. Leaves cauline. Leaf-sheaths smooth, or scaberulous; glabrous on surface. Ligule an eciliate membrane; 1–2 mm long. Leaf-blades 10–15 cm long; 1–2 mm wide. Leaf-blade surface scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; linear, or lanceolate; nodding; 6–10 cm long. Primary panicle branches naked below, or bearing spikelets almost to the base. Panicle axis scaberulous. Panicle branches capillary; scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 1 mm long; 0.25 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; 5 mm long; 1.2 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume surface scabrous. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 4 mm long; membranous; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.4–0.5 way up back of lemma; geniculate; 6 mm long overall; clearly exserted from spikelet; with a straight or slightly twisted column. Rhachilla extension 1.5 mm long; pilose; with 1–2 mm long hairs.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

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

DISTRIBUTION North America: Mexico.

NOTES Aveneae. N Amer Fl 1994.

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