Trisetum oreophilum

HABIT Perennial. Culms geniculately ascending; robust; 50–80 cm long. Leaf-sheaths pubescent; outer margin hairy. Ligule an eciliate membrane; 3–4 mm long; lacerate. Leaf-blades 10–16 cm long; 2–4 mm wide. Leaf-blade surface scabrous; glabrous. Leaf-blade margins ciliate; hairy at base.

INFLORESCENCE Inflorescence a panicle. Peduncle pilose above.

Panicle spiciform; oblong; continuous, or interrupted; 8–15 cm long; 1.5–2 cm wide. Panicle branches pubescent.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels ciliate.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 6–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma; shiny; gaping. Lower glume lanceolate; 2.6–3.6 mm long; 75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface scabrous; rough above. Lower glume apex acute. Upper glume lanceolate; 2.6–4.2 mm long; 0.75–0.85 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume surface scabrous; rough above. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 5 mm long; membranous; shiny; keeled; 5 -veined. Lemma lateral veins obscure. Lemma surface pilose. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; flexuous; 3 mm long overall. Palea gaping; 4 mm long; hyaline. Palea keels scaberulous; ciliolate. Palea apex dentate; 2 -fid.

FLOWER Lodicules 2; 1.2–1.6 mm long. Anthers 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: western South America and southern South America.

NOTES Aveneae. Louis-Marie 2005.

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