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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.
Aristida hordeacea
HABIT Annual. Culms erect; 10–90 cm long. Culm-internodes distally pubescent. Culm-nodes pubescent. Leaf-sheaths keeled. Ligule a fringe of hairs. Leaf-blades flat, or conduplicate; 5–20 cm long; 2–5 mm wide. Leaf-blade surface scabrous; rough on both sides.
INFLORESCENCE Inflorescence a panicle.
Panicle spiciform; oblong; continuous, or interrupted; 5–15 cm long. Panicle branches pubescent.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 6–9 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 0.5–0.8 mm long; pubescent; obtuse.
GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 5–8 mm long; 0.8 length of upper glume; scarious; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface glabrous, or hispidulous. Lower glume apex dentate; acute; awned; 1 -awned. Lower glume awn 2.5–5 mm long. Upper glume lanceolate; 6–9 mm long; 1.2–1.3 length of adjacent fertile lemma; scarious; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume surface glabrous, or hispidulous. Upper glume apex dentate; 2 -fid; awned; 1 -awned. Upper glume awn 1–4 mm long.
FLORETS Fertile lemma elliptic; subterete; 5–7 mm long; coriaceous; without keel; 3 -veined. Lemma surface scabrous (hooked prickles); rough in lines. Lemma margins involute; covering most of palea. Lemma apex acute; awned; 3 -awned. Principal lemma awn 3-branched; with 25–35 mm long limb; deciduous; abscissing from top of lemma. Lateral lemma awns 25–35 mm long; subequal to principal. Palea 0.1 length of lemma; without keels.
FLOWER Anthers 3.
DISTRIBUTION Africa: west tropical, west-central tropical, northeast tropical, east tropical, southern tropical, and south.
NOTES Aristideae. FTEA.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
