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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 parviseta

HABIT Perennial; caespitose; clumped loosely. Culms erect, or geniculately ascending; 60–120 cm long; 4 -noded. Culm-internodes scaberulous. Culm-nodes glabrous. Leaf-sheaths striately veined; scaberulous. Ligule an eciliate membrane; 1–4 mm long; scaberulous on abaxial surface; erose; truncate. Leaf-blades 10–25 cm long; 2–4 mm wide. Leaf-blade surface ribbed; scabrous; rough on both sides. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; 12–20 cm long. Primary panicle branches 2–6 -nate. Panicle axis with lower internodes 2.3–2.5 cm long. Panicle branches capillary; scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels clavate; 0.5–3 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; compressed slightly; 2.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent, or pilose. Floret callus hairs 0.3–1.2 mm long.

GLUMES Glumes persistent; similar; shorter than spikelet; 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 apex obtuse. Upper glume lanceolate; 0.9 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 apex obtuse.

FLORETS Fertile lemma lanceolate; 2.5 mm long; membranous; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex truncate; awned; 1 -awned. Principal lemma awn subapical; 0.5–1 mm long overall. Palea 1 length of lemma. Palea keels scaberulous; adorned above. Rhachilla extension 0.7 mm long; pilose; with 1–1.4 mm long hairs.

FLOWER Lodicules 2. Anthers 3; 0.8 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.