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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Calamagrostis purpurea

HABIT Perennial; caespitose; clumped loosely. Rhizomes short, or elongated. Culms erect; 20–200 cm long; 4–8 -noded. Lateral branches lacking, or sparse. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 6–10 mm long. Leaf-blades flat, or involute; 3–12 mm wide. Leaf-blade surface smooth, or scaberulous; rough adaxially; glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate, or elliptic; dense, or loose; nodding; 5–35 cm long. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension, or with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 2.5–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 1–1.1 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface scabrous. Lower glume apex acute. Upper glume lanceolate; 2.5–8 mm long; 1.6–1.7 length of adjacent fertile lemma; membranous; 1-keeled; 1–3 -veined. Upper glume surface scabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 1.5–5 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus, or dorsal; arising 0.5–0.8 way up back of lemma; straight; 2–6.5 mm long overall; not or scarcely exserted from spikelet. Rhachilla extension pilose.

FLOWER Lodicules 2. Anthers 3; indehiscent; yellow. Stigmas 2.

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

DISTRIBUTION Europe: northern, central, southwestern, and eastern. Asia-temperate: Siberia, Soviet far east, Soviet Middle Asia, Caucasus, China, Mongolia, and eastern Asia. North America: Subarctic.

NOTES Aveneae. Fl Eur 1994.

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