Trisetaria scabriuscula

HABIT Annual; caespitose; clumped loosely. Culms slender; 10–30 cm long. Culm-internodes distally glabrous. Leaf-sheaths pubescent to hirsute. Ligule an eciliate membrane. Leaf-blades 1–3 cm long; 1.5 mm wide. Leaf-blade surface pubescent to hirsute.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 5–9 cm long; 0.5 cm wide. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 3.2–4 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pubescent; with 0.3 mm long hairs. Floret callus pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma; shiny; gaping. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface asperulous; glabrous, or puberulous. Lower glume apex acute. Upper glume lanceolate; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume surface asperulous; glabrous, or puberulous. Upper glume apex acute.

FLORETS Fertile lemma oblong; 2.5–3.3 mm long; membranous; shiny; keeled; 5 -veined. Lemma midvein scaberulous. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn subapical; straight; 0.8–2 mm long overall. Palea gaping; hyaline.

FLOWER Anthers 3; 1 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Europe: southwestern.

NOTES Aveneae. Fl Eur 1995.

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