Calamagrostis villosa

HABIT Perennial; caespitose; clumped loosely. Rhizomes elongated. Culms geniculately ascending; 50–150 cm long; 4–5 -noded. Culm-internodes smooth. Lateral branches lacking. Ligule an eciliate membrane; 3–5 mm long; lacerate. Leaf-blades flat, or convolute; 3–8 mm wide. Leaf-blade surface scabrous; rough adaxially; pilose; sparsely hairy; hairy adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle open; linear; dense, or loose; 8–20 cm long; 3–6 cm wide. Primary panicle branches bearing spikelets almost to the base. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets cuneate; laterally compressed; 4–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 1 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 4–6 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 1.6–1.7 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; 2.5–3.5 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 2 -fid; muticous, or awned; 1 -awned. Principal lemma awn dorsal; arising 0.5–0.6 way up back of lemma; straight; 1–2 mm long overall; without a column. Rhachilla extension 0.5 mm long; pilose.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.

DISTRIBUTION Europe: central, southwestern, southeastern, and eastern.

NOTES Aveneae. Fl Eur 1995.

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