Deyeuxia matsumurae

HABIT Perennial. Cataphylls evident. Rhizomes short. Culms 50–120 cm long; 1.8–2 mm diam. Leaves cauline. Leaf-sheaths tight; smooth; glabrous on surface. Ligule an eciliate membrane; 2–6 mm long. Leaf-blades 15–30 cm long; 3–8 mm wide. Leaf-blade surface scaberulous; rough adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; dense; 7–15 cm long; 2–3 cm wide. Primary panicle branches 1–6 -nate; 1–4 cm long; bearing spikelets almost to the base. 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; 3–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.33–0.5 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 3–5 mm long; 1 length of upper glume; chartaceous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 3–5 mm long; 1.2 length of adjacent fertile lemma; chartaceous; 1-keeled. Upper glume primary vein scabrous. Upper glume apex acuminate.

FLORETS Fertile lemma ovate; 2.5–4 mm long; membranous; without keel; 3 -veined. Lemma lateral veins extending close to apex. Lemma surface scabrous. Lemma apex entire; acute; muticous.

FLOWER Lodicules 2. Anthers 3; 2 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.