Deyeuxia brassii

HABIT Perennial; caespitose; clumped densely. Culms erect; 75 cm long; 3–4 -noded. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 4–6 mm long. Leaf-blades erect; involute; 1–3 mm wide; stiff. Leaf-blade apex pungent.

INFLORESCENCE Inflorescence a panicle. Peduncle antrorsely scabrous above.

Panicle contracted, or spiciform; linear; 10–12 cm long. Primary panicle branches 2–4 cm long. Panicle axis scaberulous. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 1 mm long; 0.1–0.2 length of lemma.

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

FLORETS Fertile lemma lanceolate; 4 mm long; membranous; without keel; 5 -veined. Lemma surface puberulous. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25–0.33 way up back of lemma; geniculate; 5–6 mm long overall; with twisted column. Palea 0.8 length of lemma. 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 Asia-tropical: Papuasia.

NOTES Aveneae. Hitchcock 1994.

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