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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 hakonensis

HABIT Perennial; caespitose; clumped loosely. Cataphylls inconspicuous. Rhizomes short; knotty. Culms geniculately ascending; 30–60 cm long; 0.5–1 mm diam.; 3–4 -noded. Culm-internodes 2–8 cm long. Leaves cauline. Leaf-sheaths smooth; glabrous on surface, or puberulous; with reflexed hairs; outer margin hairy. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane; 1–1.5 mm long; truncate, or obtuse. Leaf-blades 7–30 cm long; 3–8 mm wide. Leaf-blade surface scaberulous; rough adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate, or ovate; 5–15 cm long; 1–1.5 cm wide. Primary panicle branches 2–5 -nate. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 3 mm long; 0.75–1 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny. Lower glume lanceolate; 3.5–6 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 3.5–6 mm long; 1.2 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acuminate.

FLORETS Fertile lemma ovate; 3–5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins extending close to apex. Lemma apex entire, or dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.1 way up back of lemma; straight; 2–4 mm long overall; without a column. Rhachilla extension 1–1.5 mm long; pilose; with 1.5–2 mm long hairs.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

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

DISTRIBUTION Asia-temperate: Soviet far east, China, and eastern Asia.

NOTES Aveneae. Koyama 1994.

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