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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Deyeuxia exilis

HABIT Perennial; mat forming, or caespitose; clumped loosely. Basal innovations extravaginal. Culms 5–15 cm long. Ligule an eciliate membrane; 0.4–0.5 mm long; erose; truncate. Leaf-blades erect; filiform; involute; 2–4.5 cm long. Leaf-blade surface smooth; glabrous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth; glabrous.

Panicle open; linear; 15–22 cm long; 0.5–1 cm wide. Primary panicle branches ascending; 1–3 -nate; 0.5–1 cm long; bearing 2–6 fertile spikelets on each lower branch. Panicle branches stiff; smooth, or scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels smooth, or scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets ovate; laterally compressed; 1.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent; obtuse; disarticulating transversely. Floret callus hairs 0.3–0.4 mm long; 0.2 length of lemma.

GLUMES Glumes persistent; similar; shorter than spikelet; firmer than fertile lemma. Lower glume lanceolate; 0.95–1.15 mm long; 0.9 length of upper glume; coriaceous; 1-keeled; 1 -veined. Lower glume primary vein smooth, or scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 1–1.25 mm long; 0.75–0.85 length of adjacent fertile lemma; coriaceous; 1-keeled; 1 -veined. Upper glume primary vein smooth, or scaberulous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma ovate; 1.25–1.45 mm long; chartaceous; without keel; 5 -veined. Lemma surface smooth. Lemma apex obtuse; awned; 1 -awned. Principal lemma awn subapical; straight, or curved; 0.3–0.45 mm long overall. Palea lanceolate; 1.2–1.25 mm long; 2 -veined. Palea apex truncate. Rhachilla extension 0.3–0.4 mm long; glabrous.

FLOWER Anthers 3; 0.25 mm long; yellow.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: Papuasia.

NOTES Aveneae. Veldkamp 2005.

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