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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 pyramidatum

HABIT Perennial. Rhizomes short. Culms 37–50 cm long; 2 -noded. Leaf-sheaths glabrous on surface, or pubescent. Ligule an eciliate membrane; 2–3 mm long; glabrous on abaxial surface; erose; obtuse. Leaf-blades 4–7 cm long; 2–2.5 mm wide.

INFLORESCENCE Inflorescence a panicle. Peduncle pubescent above.

Panicle contracted; lanceolate; interrupted; 7–11 cm long; 2–3 cm wide. Primary panicle branches 3 -nate; 3 cm long; bearing spikelets almost to the base.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 6–6.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1 mm long; pilose; with 1.5 mm long hairs. Floret callus pubescent; truncate.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma; shiny; gaping. Lower glume lanceolate; 5.5–7.5 mm long; 0.75 length of upper glume; membranous; much thinner on margins; purple; 1-keeled; 1 -veined. Lower glume primary vein ciliate. Lower glume lateral veins absent. Lower glume apex setaceously attenuate. Upper glume lanceolate; 6.5–9 mm long; 1 length of adjacent fertile lemma; membranous; with hyaline margins; purple; 1-keeled; 3 -veined. Upper glume apex setaceously attenuate.

FLORETS Fertile lemma oblong; 6.5–7 mm long; membranous; shiny; keeled; 5 -veined. Lemma apex awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; curved, or geniculate; 6–7 mm long overall; with a straight or slightly twisted column. Palea gaping; 4–5 mm long; hyaline. Palea keels scabrous. Palea apex with excurrent keel veins.

FLOWER Lodicules 2; 0.8 mm long; 2-toothed. Anthers 3; 0.8 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; 2.5 mm long. Endosperm farinose.

DISTRIBUTION South America: southern South America.

NOTES Aveneae. Finot 2007.

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