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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Aristida repens

HABIT Annual. Culms decumbent; 15–50 cm long; rooting from lower nodes. Culm-internodes terete; smooth, or scaberulous. Lateral branches ample. Leaf-sheaths mostly shorter than adjacent culm internode; glabrous on surface. Leaf-sheath oral hairs ciliate. Ligule a fringe of hairs. Collar glabrous. Leaf-blades flat, or convolute; 10–15 cm long; 1–1.5 mm wide. Leaf-blade surface scaberulous; rough adaxially. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 10–15 cm long. Primary panicle branches appressed; 1 -nate; 1–3 cm long; bearing spikelets almost to the base. Panicle axis angular; scaberulous. Panicle branches flexuous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 5–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.5–1.5 mm long; pilose; obtuse.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 5–7 mm long; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex attenuate. Upper glume lanceolate; 5–7 mm long; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex dentate; 2 -fid; mucronate.

FLORETS Fertile lemma oblong; subterete; 3–5 mm long; coriaceous; without keel; 3 -veined. Lemma surface smooth, or scaberulous; rough above. Lemma margins convolute; covering most of palea. Lemma apex acute; awned; 3 -awned. Principal lemma awn 3-branched; with 5–10 mm long limb; with twisted column; deciduous; abscissing from top of column. Column of lemma awn 0.5–2.5 mm long. Lateral lemma awns 5–7 mm long; subequal to principal.

DISTRIBUTION Pacific: south-central (Henrard 1999). South America: western South America.

NOTES Aristideae.

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