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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 carchiensis
HABIT Perennial; culms solitary, or caespitose; clumped loosely. Rhizomes short. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms 30–85 cm long; 1.5–2 mm diam. Culm-internodes striate; smooth, or antrorsely scabrous. Culm-nodes brown. Leaf-sheaths striately veined; glabrous on surface. Ligule an eciliate membrane; 3 mm long; erose; obtuse. Leaf-blades flat, or involute; 15–30 cm long; 7 mm wide. Leaf-blade surface ribbed; grooved adaxially; glabrous; hairless except near base.
INFLORESCENCE Inflorescence a panicle.
Panicle contracted; linear; interrupted; 12–19 cm long; 0.5–0.8 cm wide. Primary panicle branches appressed; 1 -nate. Panicle axis scaberulous. Panicle branches scabrous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5–4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.
GLUMES Glumes persistent; similar; reaching apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; purple; 1-keeled; keeled above; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 3.5–4 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; keeled above; 3 -veined. Upper glume primary vein scabrous. Upper glume lateral veins obscure. Upper glume surface scabrous; rough on veins. Upper glume apex acute.
FLORETS Fertile lemma lanceolate; 3.5–4 mm long; membranous; pallid; without keel; 5 -veined. Lemma surface scaberulous. Lemma apex erose; awned; 1 -awned. Principal lemma awn dorsal; arising 0.75 way up back of lemma; straight; 0.7–1 mm long overall; not or scarcely exserted from spikelet. Palea linear; 2.5 mm long. Rhachilla extension 0.7–1.2 mm long; pubescent.
FLOWER Lodicules 2. Anthers 1; 1.2 mm long; purple. Stigmas 2.
FRUIT Caryopsis with adherent pericarp; trigonous; 1.8 mm long; light brown. Embryo 0.15 length of caryopsis. Disseminule comprising a floret.
DISTRIBUTION South America: western South America.
NOTES Aveneae. Laegaard 2001.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
