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 apsleyensis

HABIT Perennial; caespitose; clumped loosely. Butt sheaths pilose. Culms erect; slender; 50–90 cm long. Culm-internodes mid-green, or purple; smooth, or scaberulous; distally glabrous, or pilose. Culm-nodes purple; glabrous. Leaf-sheaths mostly shorter than adjacent culm internode; smooth, or retrorsely scabrous; glabrous on surface, or pilose. Ligule a ciliolate membrane; 1 mm long; pubescent on abaxial surface; obtuse. Leaf-blades conduplicate, or involute; 15–35 cm long; 1–1.5 mm wide. Leaf-blade surface pilose.

INFLORESCENCE Inflorescence a panicle.

Panicle open, or contracted; elliptic; 7–14 cm long. Primary panicle branches 2–4.5 cm long. Panicle axis scabrous. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 5.5–6.75 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 1.5 mm long.

GLUMES Glumes persistent; similar; reaching apex of florets; thinner than fertile lemma. Lower glume lanceolate; 4.5–5 mm long; 0.9 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume surface smooth, or asperulous. Lower glume apex acute, or acuminate. Upper glume lanceolate; 5–6.5 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 surface smooth, or asperulous. Upper glume apex acute, or acuminate.

FLORETS Fertile lemma lanceolate; 5–6.5 mm long; chartaceous; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.33 way up back of lemma; geniculate; 7.5–8 mm long overall; with twisted column. Palea 1 length of lemma. Palea keels ciliolate. Rhachilla extension 1.5 mm long; pilose; with 1–1.5 mm long hairs.

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

FRUIT Caryopsis with adherent pericarp; 3 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.