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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 crassiuscula

HABIT Perennial. Culms erect, or geniculately ascending; 15–30 cm long; 5–7 -noded. Leaf-sheaths longer than adjacent culm internode; smooth. Ligule a ciliolate membrane; 1–2 mm long; scaberulous on abaxial surface, or pubescent on abaxial surface; lacerate; truncate. Leaf-blades flat, or involute; 3–10 cm long; 4–6 mm wide. Leaf-blade surface ribbed; smooth, or scabrous; rough abaxially; puberulous; hairy adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear, or lanceolate; 6–7 cm long; 0.7–1.2 cm wide. Panicle axis with lower internodes 1.5–2 cm long. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.8–2 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.5–1.4 mm long.

GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma; parallel to lemmas. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acute; muticous, or mucronate. Upper glume lanceolate; 1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume surface asperulous. Upper glume apex acute; muticous, or mucronate.

FLORETS Fertile lemma lanceolate; 4 mm long; cartilaginous; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex truncate, or acute; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; straight; 0.5–6 mm long overall; without a column. Palea 1 length of lemma. Palea keels scaberulous; adorned above. Palea surface scaberulous. Rhachilla extension 0.7 mm long; glabrous.

FLOWER Lodicules 2. Anthers 3; 1–1.2 mm long. Stigmas 2.

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

DISTRIBUTION Australasia: Australia.

NOTES Aveneae. Vickery 1994.

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