GrassBase - The Online World Grass Flora


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

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

Deyeuxia brachyathera

HABIT Perennial; caespitose; clumped loosely. Culms erect; 60–120 cm long; 4 -noded. Culm-internodes scaberulous. Culm-nodes glabrous. Leaf-sheaths scaberulous. Ligule an eciliate membrane; 3 mm long; scaberulous on abaxial surface; obtuse. Leaf-blades 20–35 cm long; 3–7 mm wide. Leaf-blade surface scabrous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear, or lanceolate; 8–17 cm long; 0.8–2 cm wide. Primary panicle branches 3–5 -nate. Panicle axis with lower internodes 2–3 cm long. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.5–1.5 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension, or with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.3–0.8 mm long.

GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma. Lower glume lanceolate; 0.9 length of upper glume; membranous; much thinner on margins; mid-green, or purple; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acuminate. Upper glume lanceolate; 1 length of adjacent fertile lemma; membranous; with scarious margins; mid-green, or purple; 1-keeled; 1–3 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent, or obscure. Upper glume surface asperulous. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 4.5–6 mm long; membranous; without keel; 5 -veined. Lemma lateral veins distinct. Lemma surface scaberulous. Lemma apex entire, or dentate; 2 -fid; acute; awned; 1 -awned. Principal lemma awn dorsal; arising 0.75–0.85 way up back of lemma; curved; 4–5 mm long overall. Palea 2.5–4 mm long. Palea keels scaberulous; adorned above. Rhachilla extension glabrous.

FLOWER Lodicules 2. Anthers 3; 0.4–0.7 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.