Deyeuxia macgregorii

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms erect; 55–90 cm long. Ligule an eciliate membrane; 1.5–4 mm long. Leaf-blades involute; 17.5–30 cm long; 1–2 mm wide; stiff.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 11–17.5 cm long; 0.3–4.5 cm wide. Primary panicle branches 3–5 -nate; 4.5–7 cm long; bearing 5–32 fertile spikelets on each lower branch. Panicle axis smooth.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 1.6–3 mm long; 0.25–0.5 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 6 mm long; 1 length of upper glume; coriaceous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 6 mm long; 1.2–1.5 length of adjacent fertile lemma; coriaceous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 4–5.3 mm long; membranous; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.33–0.5 way up back of lemma; geniculate; 6.25–9.5 mm long overall; with twisted column. Rhachilla extension 2.5–3.5 mm long; pilose, or villous; with 1.25–2.5 mm long hairs.

FLOWER Lodicules 2. Anthers 3; 1.5–2.25 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-tropical: Papuasia.

NOTES Aveneae. Veldkamp 2008.

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