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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.
Trisetum andinum
HABIT Perennial; caespitose. Rhizomes absent, or short. Culms erect; (9–)20–42 cm long; 2–4 mm diam.; 1–2 -noded. Culm-internodes distally pubescent. Leaf-sheaths 5–10 cm long; pubescent, or pilose. Ligule a ciliolate membrane; 0.5–2 mm long; pilose on abaxial surface; truncate. Leaf-blades 3–15 cm long; 2–3.5 mm wide. Leaf-blade surface pilose; hairy on both sides. Leaf-blade apex acuminate.
INFLORESCENCE Inflorescence a panicle; exserted, or embraced at base by subtending leaf. Peduncle pubescent above.
Panicle spiciform; ovate; truncate or rounded at the ends; 3–6 cm long; 1–2.5 cm wide. Panicle axis pubescent.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 5–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.6–0.8 mm long; pilose. Floret callus pubescent; obtuse.
GLUMES Glumes persistent; similar; with lower narrower than upper; reaching apex of florets, or exceeding apex of florets; thinner than fertile lemma; shiny; gaping. Lower glume linear, or lanceolate; 3.5–6 mm long; 0.9 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex attenuate. Upper glume ovate; 4–7 mm long; 1–1.1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.
FLORETS Fertile lemma elliptic; 5–5.5 mm long; membranous; shiny; keeled; 5 -veined. Lemma surface puberulous. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; curved; 3.6–4.5 mm long overall. Lateral lemma awns arising on apex of lobes; 0.4–0.5 mm long. Palea gaping; 3.7–6 mm long; hyaline. Palea keels scaberulous.
FLOWER Lodicules 2; 0.6 mm long. Anthers 3; 0.7–1 mm long. Ovary glabrous.
FRUIT Caryopsis with adherent pericarp; 2.2–2.5 mm long; glabrous.
DISTRIBUTION South America: western South America.
NOTES Aveneae. Finot et al 2006.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
