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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Deyeuxia zenkeri
HABIT Annual; caespitose. Culms erect, or geniculately ascending; 30–60 cm long. Culm-internodes smooth, or scaberulous; distally glabrous. Lateral branches sparse, or ample. Leaf-sheaths tight; striately veined; scaberulous; glabrous on surface. Ligule an eciliate membrane; 1–2 mm long; scaberulous on abaxial surface. Leaf-blades 5–11 cm long; 3–5 mm wide. Leaf-blade surface scaberulous, or scabrous; rough on both sides. Leaf-blade margins scabrous. Leaf-blade apex acuminate.
INFLORESCENCE Inflorescence a panicle.
Panicle open; elliptic, or ovate; 15–32 cm long; 10 cm wide. Primary panicle branches spreading; 3–4 -nate. Panicle axis smooth; glabrous. Panicle branches scaberulous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels scaberulous; tip widened.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 2–2.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.5 length of lemma.
GLUMES Glumes persistent; similar; with lower wider than upper; reaching apex of florets; thinner than fertile lemma; gaping. Lower glume lanceolate; 2.5 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 acuminate. Upper glume lanceolate; 2 mm long; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acuminate.
FLORETS Fertile lemma elliptic, or ovate; 2.5 mm long; 2 mm wide; chartaceous; without keel; 3 -veined. Lemma lateral veins prominent. Lemma surface scaberulous. Lemma apex muticous, or awned; 1 -awned. Principal lemma awn subapical; 0.5 mm long overall; not or scarcely exserted from spikelet. Palea 0.75 length of lemma; hyaline; 2 -veined. Rhachilla extension pilose.
FLOWER Anthers 3; 0.5–0.8 mm long. Stigmas 2.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION Asia-tropical: India.
NOTES Aveneae. Bor 2006.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
