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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 innominata

HABIT Perennial; caespitose; clumped loosely, or moderately, or densely. Culms 15–25(–60) cm long. Culm-internodes smooth. Leaf-sheaths ribbed. Ligule an eciliate membrane; 2–2.5 mm long; truncate. Leaf-blades straight, or curved; involute; 4–8(–15) cm long; 1–3 mm wide; stiff. Leaf-blade surface ribbed; grooved adaxially; smooth, or scabrous; rough adaxially; glabrous, or pilose; hairy abaxially.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth, or antrorsely scabrous above.

Panicle contracted; linear, or elliptic; 2–8 cm long. Primary panicle branches naked below, or bearing spikelets almost to the base. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 2–3.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.5 length of lemma.

GLUMES Glumes persistent; similar; reaching apex of florets; thinner than fertile lemma. Lower glume oblong; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume oblong; 2–3.5 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 2.25–3 mm long; chartaceous; without keel; 5 -veined. Lemma lateral veins obscure, or distinct. Lemma apex acute; muticous, or awned; 1 -awned. Principal lemma awn subapical; 0.5–1 mm long overall. Palea 2–2.5 mm long. Palea keels smooth. Rhachilla extension 1 mm long; villous; with 2–2.5 mm long hairs.

FLOWER Lodicules 2. Anthers 3; 0.5–0.75 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 1.5 mm long. Hilum punctiform. Disseminule comprising a floret.

DISTRIBUTION Australasia: Australia.

NOTES Aveneae. Morris 1997.

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