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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 crispa

HABIT Perennial. Culms erect; 5–10 cm long. Culm-internodes estriate; smooth. Leaf-sheaths smooth. Ligule a ciliolate membrane; 1.2–4 mm long; glabrous on abaxial surface; bilobed. Leaf-blades conduplicate; 4–10 cm long; 2 mm wide. Leaf-blade venation without layer of subepidermal sclerenchyma masking vein striation. Leaf-blade surface ribbed; grooved adaxially; scabrous; rough adaxially, or on both sides. Leaf-blade margins ciliate. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle; shorter than basal leaves.

Panicle contracted; linear; 3–5 cm long; 0.5 cm wide. Primary panicle branches 1–3 cm long. Panicle axis smooth, or scaberulous.

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; 5.4–6.2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent; with elliptic scar. Floret callus hairs 1 mm long; 0.2–0.25 length of lemma.

GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma. Lower glume lanceolate; 5.4–6.2 mm long; 1.1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex attenuate. Upper glume lanceolate; 5–5.8 mm long; membranous; 1-keeled; 3 -veined. Upper glume primary vein scaberulous. Upper glume apex attenuate.

FLORETS Fertile lemma lanceolate; 4.4–5 mm long; membranous; purple; without keel; 5 -veined. Lemma surface scabrous; rough above. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.33–0.5 way up back of lemma; geniculate; 5–6.2 mm long overall; clearly exserted from spikelet; with twisted column. Palea 3.2–3.4 mm long. Rhachilla extension 1.8–2.4 mm long; villous; with 2.4–3.2 mm long hairs.

FLOWER Lodicules 2. Anthers 3; linear; 1.6–2.4 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.