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 hirsuta

HABIT Perennial. Culms erect; 26–50 cm long. Culm-internodes antrorsely scabrous; distally glabrous, or pilose. Leaf-sheaths scaberulous. Ligule a ciliolate membrane; 1.2–3.4 mm long; truncate, or obtuse. Leaf-blades straight; filiform; convolute; 17–33 cm long; 1–3 mm wide; stiff. Leaf-blade surface scabrous; rough on both sides; glabrous, or puberulous; hairy adaxially. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle; shorter than basal leaves.

Panicle contracted; linear; 8–14 cm long; 0.5–1 cm wide. Primary panicle branches 2–6 cm long. Panicle axis smooth, or scaberulous. Panicle branches hispidulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.8–2.5 mm long; pubescent.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.4–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.6–0.8 mm long; 0.25 length of lemma.

GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma. Lower glume lanceolate; 4.4–5 mm long; 1 length of upper glume; membranous; mid-green, or purple; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface scabrous. Lower glume apex acute. Upper glume lanceolate; 4.4–5 mm long; membranous; mid-green, or purple; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume surface scabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3.6–4.6 mm long; membranous; mid-green, or purple; without keel; 5 -veined. Lemma surface scabrous; rough generally, or above. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25 way up back of lemma; geniculate; 4–5 mm long overall; not or scarcely exserted from spikelet; with twisted column. Palea 2.8–3.6 mm long. Rhachilla extension 2.8–3.6 mm long; pilose; with 1–1.4 mm long hairs.

FLOWER Lodicules 2. Anthers 3; linear; 1.6–2.2 mm long. Stigmas 2.

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

DISTRIBUTION South America: western South America.

NOTES Aveneae. Villav 1996.

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