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 microseta

HABIT Perennial; caespitose; clumped loosely. Butt sheaths green, or purple. Culms erect; slender; 40–60 cm long; 3–4 -noded. Culm-internodes scaberulous. Culm-nodes glabrous. Leaf-sheaths scaberulous. Ligule an eciliate membrane; 3–4 mm long; pubescent on abaxial surface; lacerate; obtuse. Leaf-blades 5–20 cm long; 1.5–3 mm wide. Leaf-blade surface scabrous. Leaf-blade margins scabrous. Leaf-blade apex acute, or acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open, or contracted; linear, or elliptic; 3–10 cm long. Primary panicle branches appressed, or ascending; 2–3 -nate; sparsely divided; 0.5–2 cm long. Panicle axis with lower internodes 1–2.5 cm long. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.3–3 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5–4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent, or pilose. Floret callus hairs 0.5–1.5 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. 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 acute. Upper glume lanceolate; 3.5–4 mm long; 1.1 length of adjacent fertile lemma; membranous; with scarious margins; mid-green, or purple; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume surface asperulous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3–3.5 mm long; membranous; without keel; 3–5 -veined. Lemma surface scaberulous. Lemma apex truncate, or acute; awned; 1 -awned. Principal lemma awn subapical; 0.5–1 mm long overall. Palea keels scaberulous; adorned above. Palea surface scaberulous. Rhachilla extension 0.7 mm long; pilose; with 1.5 mm long hairs.

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

FRUIT Caryopsis with adherent pericarp; ellipsoid; 2 mm long. 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.