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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 triseta
HABIT Perennial; caespitose. Culms 12–22 cm long; 0.5–1 mm diam.; 1–2 -noded. Leaves mostly basal. Leaf-sheaths loose; 2.5–4 cm long. Leaf-sheath oral hairs lacking, or ciliate. Ligule a fringe of hairs; 0.2 mm long. Leaf-blades involute; 3.5–7 cm long; 1–2 mm wide; glaucous.
INFLORESCENCE Inflorescence a panicle.
Panicle open; linear; 3.5–7.5 cm long. Primary panicle branches 1–2 -nate; bearing 2–4 fertile spikelets on each lower branch. Panicle axis scaberulous.
Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels 1–10 mm long.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 7–10 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; pubescent; obtuse. Floret callus hairs 0.5 mm long.
GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 6–8 mm long; 0.7–0.8 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface smooth, or asperulous. Lower glume apex acuminate. Upper glume lanceolate; 7–10 mm long; 1.3 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume surface smooth, or asperulous. Upper glume apex acuminate.
FLORETS Fertile lemma elliptic; subterete; 6.5–8 mm long; coriaceous; dark brown, or black; without keel; 3 -veined. Lemma surface scaberulous; rough above. Lemma margins convolute; covering most of palea. Lemma apex acute; awned; 3 -awned. Principal lemma awn straight; with 4–8 mm long limb; persistent. Lateral lemma awns 0.5–3.5 mm long; shorter than principal. Palea 1.5–2 mm long; 0.2 length of lemma; 2 -veined; without keels. Palea apex obtuse.
FLOWER Lodicules 2; 1.2 mm long; veined; glabrous. Anthers 3; 3–3.5 mm long.
FRUIT Caryopsis with adherent pericarp; fusiform; sulcate on hilar side; 5 mm long.
DISTRIBUTION Asia-temperate: China.
NOTES Aristideae. Keng 1996.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
