Trisetum barbatipaleum

HABIT Perennial; caespitose. Culms 40 cm long. Culm-internodes distally pubescent. Culm-nodes pubescent. Leaf-sheaths mostly shorter than adjacent culm internode; pubescent. Ligule an eciliate membrane. Leaf-blades 7 cm long; 1–2 mm wide. Leaf-blade surface pubescent; hairy adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear; interrupted; 8–10 cm long; 0.5–1 cm wide. Panicle axis pubescent.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 5–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 2 mm long.

GLUMES Glumes persistent; similar; with lower narrower than upper; shorter than spikelet; thinner than fertile lemma; shiny; gaping. Lower glume lanceolate; 3–3.2 mm long; 0.75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume ovate; 4 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scaberulous. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 3.5–5 mm long; membranous; shiny; keeled; 5 -veined. Lemma surface pubescent. Lemma apex dentate; 2 -fid; setaceously attenuate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; curved; 6 mm long overall. Palea gaping; hyaline. Palea keels ciliate; adorned above. Rhachilla extension 1 mm long; pilose.

FLOWER Lodicules 2; 1 mm long; 2-toothed. Anthers 3. Ovary glabrous.

FRUIT Hilum punctiform.

DISTRIBUTION North America: Mexico.

NOTES Aveneae. Finot et al 2006.

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