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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 planifolia

HABIT Perennial. Culms erect; 72 cm long. Culm-internodes smooth, or scaberulous. Leaf-sheaths antrorsely scabrous; glabrous on surface, or pilose. Ligule a ciliolate membrane; 0.8 mm long; erose; truncate. Leaf-blades flat; 20–40 cm long; 2–2.5 mm wide. Leaf-blade surface scabrous; rough on both sides. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; 20 cm long; 4 cm wide. Primary panicle branches 9 cm long. Panicle axis scabrous; glabrous, or hispidulous. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.8–4 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.8–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.6 mm long; 0.15 length of lemma.

GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma. Lower glume lanceolate; 3.6–4.6 mm long; 0.9 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface smooth, or asperulous. Lower glume apex acute. Upper glume lanceolate; 3.8–5 mm long; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume surface smooth, or asperulous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3.4–4.2 mm long; membranous; purple; without keel; 5 -veined. Lemma surface scabrous. Lemma apex dentate; 2 -fid, or 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5–0.6 way up back of lemma; geniculate; 5–6.6 mm long overall; clearly exserted from spikelet; with twisted column. Palea 2.4–3.2 mm long. Rhachilla extension 1–1.8 mm long; villous; with 3 mm long hairs.

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

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

DISTRIBUTION South America: northern South America and western South America.

NOTES Aveneae. Villav 1996.

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