Trisetum macrotrichum

HABIT Perennial. Stolons present. Culms 40–50 cm long. Culm-internodes scaberulous. Leaf-sheaths scaberulous; pilose. Ligule an eciliate membrane. Leaf-blades 7–15 cm long; 5–10 mm wide. Leaf-blade surface scabrous. Leaf-blade margins ciliate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; equilateral, or nodding; 6–10 cm long; 2–3 cm wide.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 3–4 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 5–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pilose; with 2.5–4 mm long hairs. Floret callus pubescent.

GLUMES Glumes persistent; similar; with lower narrower than upper; shorter than spikelet; thinner than fertile lemma; shiny; gaping. Lower glume lanceolate; 0.66 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein smooth, or scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein smooth, or scaberulous. Upper glume apex acute.

FLORETS Fertile lemma oblong; 4–6.5 mm long; membranous; shiny; keeled; 5 -veined. Lemma surface asperulous. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5–0.66 way up back of lemma; curved, or geniculate; 3.5–5.5 mm long overall; without a column, or with a straight or slightly twisted column. Palea gaping; hyaline.

FLOWER Anthers 3; 2 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Europe: southeastern and eastern.

NOTES Aveneae. Fl Eur 1995.

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