Deyeuxia tashiroi

HABIT Perennial; caespitose; clumped loosely. Cataphylls inconspicuous. Rhizomes short. Culms 20–40 cm long; 0.7–1 mm diam.; 4–5 -noded. Culm-internodes 2–5 cm long. Leaves cauline. Leaf-sheaths mostly shorter than adjacent culm internode; smooth; glabrous on surface. Leaf-sheath oral hairs lacking, or pubescent. Ligule an eciliate membrane; 1–2 mm long. Leaf-blades linear, or lanceolate; 8–13 cm long; 4–10 mm wide; pruinose. Leaf-blade surface scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; 5–8 cm long; 1.5–2.5 cm wide. Primary panicle branches 2–3 -nate; 1–3 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.25–0.66 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 5–6 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 5–6 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume primary vein scaberulous. Upper glume apex acuminate.

FLORETS Fertile lemma ovate; 4.5–5.5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins extending close to apex. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; geniculate; 1–2 mm long overall; with twisted column.

FLOWER Lodicules 2. Anthers 3; 2.5 mm long. Stigmas 2.

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

DISTRIBUTION Asia-temperate: eastern Asia.

NOTES Aveneae. Koyama 1994.

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