Deyeuxia atjehensis

HABIT Perennial; caespitose. Culms erect; 40–50 cm long. Ligule an eciliate membrane; 2–3 mm long. Leaf-blades involute; 10–15 cm long; 2.5–7 mm wide; stiff. Leaf-blade apex pungent.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; lanceolate; 10–15 cm long; 1.5–3 cm wide. Primary panicle branches 2–5 -nate. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets cuneate; laterally compressed; 5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.2–0.33 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 5–6 mm long; 1 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume apex acute. Upper glume lanceolate; 5–6 mm long; 1.2 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 4–4.5 mm long; chartaceous; without keel; 5 -veined. Lemma apex obtuse; awned; 1 -awned. Principal lemma awn from a sinus; straight; 0.5 mm long overall; not or scarcely exserted from spikelet. Palea keels smooth. Rhachilla extension 1 mm long; pilose.

FLOWER Lodicules 2. Anthers 3; 1–1.5 mm long. Stigmas 2.

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

DISTRIBUTION Asia-tropical: Malesia.

NOTES Aveneae. Ohwi 1994.

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