Deyeuxia pickeringii

HABIT Perennial; culms solitary. Rhizomes elongated. Culms 30–60 cm long. Leaf-sheaths smooth, or scaberulous; glabrous on surface. Leaf-sheath oral hairs lacking. Ligule an eciliate membrane; 2–4 mm long. Leaf-blades erect; 10–15 cm long; 4–5 mm wide. Leaf-blade surface scabrous.

INFLORESCENCE Inflorescence a panicle. Peduncle antrorsely scabrous above.

Panicle contracted; linear; 7–12 cm long. Primary panicle branches 1–2 cm long. Panicle axis scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4–4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.5 mm long; 0.1–0.15 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 acute. Upper glume lanceolate; 4–4.5 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3.5–4 mm long; membranous; without keel; 5 -veined. Lemma apex awned; 1 -awned. Principal lemma awn dorsal; arising 0.25 way up back of lemma; geniculate; 2–3 mm long overall; not or scarcely exserted from spikelet; with a straight or slightly twisted column. Rhachilla extension 1 mm long; pubescent.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

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

DISTRIBUTION North America: eastern Canada and northeast USA.

NOTES Aveneae. N Amer Fl 1994.

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