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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 angustifolia

HABIT Perennial; caespitose; clumped densely. Butt sheaths green, or purple. Culms erect; 30–70 cm long; 4 -noded. Culm-internodes distally glabrous. Culm-nodes glabrous. Leaves mostly basal. Leaf-sheaths mostly shorter than adjacent culm internode; striately veined; scaberulous. Ligule an eciliate membrane; 1–2 mm long; scaberulous on abaxial surface; truncate. Leaf-blades involute; 15–30 cm long; 1–2 mm wide. Leaf-blade surface ribbed; grooved adaxially and abaxially; scabrous; rough on both sides. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 2–9 cm long; 0.4–0.7 cm wide. Primary panicle branches appressed. Panicle axis with lower internodes 1–1.5 cm long; scabrous. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.5–2 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; similar; reaching apex of florets; similar to fertile lemma in texture; gaping. Lower glume lanceolate; 1 length of upper glume; chartaceous; mid-green, or purple; 1-keeled; 7 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acute. Upper glume lanceolate; 4–5 mm long; 1 length of adjacent fertile lemma; chartaceous; 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; 4–5 mm long; chartaceous; without keel; 5 -veined. Lemma lateral veins distinct. Lemma surface scaberulous. Lemma apex entire, or dentate; 2 -fid; truncate; awned; 1 -awned. Principal lemma awn subapical; 1 mm long overall. Palea 1 length of lemma. Palea keels scaberulous. Rhachilla extension 0.2 mm long; glabrous.

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

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

DISTRIBUTION Australasia: Australia.

NOTES Aveneae. Vickery 1997.

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