Deyeuxia deschampsioides

HABIT Perennial; culms solitary, or caespitose; clumped loosely. Rhizomes elongated. Culms geniculately ascending; 15–40 cm long. Culm-internodes smooth. Leaves mostly basal. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 2–3 mm long. Leaf-blades 3–7 cm long; 1–4 mm wide. Leaf-blade surface smooth. Leaf-blade margins scaberulous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; pyramidal; 4–8 cm long. Primary panicle branches spreading; whorled at most nodes. Panicle axis smooth. Panicle branches capillary; flexuous; smooth.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.5 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 apex acuminate. Upper glume lanceolate; 4–6 mm long; 1 length of adjacent fertile lemma; membranous; purple; 1-keeled; 1 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 4–6 mm long; membranous; without keel; 5 -veined. Lemma apex awned; 1 -awned. Principal lemma awn dorsal; arising 0.5–0.6 way up back of lemma; geniculate; 3–5 mm long overall; clearly exserted from spikelet; with twisted column. Rhachilla extension 1 mm long; pilose.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

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

DISTRIBUTION Europe: eastern. Asia-temperate: Siberia, Soviet far east, and eastern Asia. North America: Subarctic, western Canada, and eastern Canada.

NOTES Aveneae. N Amer Fl 1994.

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