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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 imbricata

HABIT Perennial; caespitose. Culms erect; 80–100 cm long; 3–4 -noded. Culm-nodes glabrous. Leaves mostly basal. Leaf-sheaths scaberulous; glabrous on surface. Ligule an eciliate membrane; 3–6 mm long; erose; truncate. Leaf-blades 15–30 cm long; 2–4.5 mm wide. Leaf-blade surface scaberulous; rough on both sides. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle; embraced at base by subtending leaf.

Panicle spiciform; linear; continuous, or interrupted; 7–14 cm long; 0.6–1.5 cm wide. Primary panicle branches appressed. Panicle axis scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; terete; 0.3–1 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2–3.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; similar; exceeding apex of florets; similar to fertile lemma in texture. Lower glume lanceolate; 2–3.5 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 2–3.5 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 1.8–3 mm long; membranous; without keel; 5 -veined. Lemma surface scabrous. Lemma apex dentate; 4 -fid; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66–0.75 way up back of lemma; straight; 0.5–1 mm long overall; not or scarcely exserted from spikelet. Palea 0.75 length of lemma; hyaline; 2 -veined.

FLOWER Lodicules 2; lanceolate; membranous. Anthers 3; 0.7 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Australasia: Australia.

NOTES Aveneae. Tothill 1993.

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