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Descriptions

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

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

Trisetum caudulatum

HABIT Perennial. Rhizomes short. Culms erect; slender; 40–90 cm long; 3 -noded. Culm-internodes smooth, or scaberulous. Culm-nodes pubescent. Leaf-sheaths pubescent. Ligule a ciliolate membrane; 1–2.5 mm long; pubescent on abaxial surface; obtuse, or acute. Leaf-blades 10–20 cm long; 2.5–5 mm wide. Leaf-blade surface scabrous; rough adaxially; pubescent; hairy abaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; lanceolate, or oblong; 10–14 cm long. Panicle axis glabrous, or pubescent. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2–6 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 6–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1 mm long; pilose; with 1–1.5 mm long hairs. Floret callus pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma; shiny; gaping. Lower glume lanceolate; 4–5 mm long; 0.66 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex setaceously attenuate. Upper glume lanceolate; 6–6.5 mm long; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex setaceously attenuate.

FLORETS Fertile lemma oblong; 6–6.5 mm long; membranous; much thinner on margins; shiny; keeled; 5 -veined. Lemma surface asperulous. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; curved; 6–8 mm long overall. Lateral lemma awns 1 mm long. Palea gaping; 0.75–1 length of lemma; hyaline. Palea keels scaberulous. Palea apex with excurrent keel veins.

FLOWER Anthers 3; 1 mm long; eventually exserted, or retained within floret.

FRUIT Caryopsis with adherent pericarp; 3–3.5 mm long; glabrous, or hairy at apex. Hilum punctiform. Endosperm liquid.

DISTRIBUTION South America: southern South America.

NOTES Aveneae. Fl Pat 1995.

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