Calamagrostis sachalinensis

HABIT Perennial; caespitose. Cataphylls evident. Rhizomes short. Culms erect; 30–60 cm long; 0.8–1.2 mm diam.; 4–5 -noded. Culm-internodes antrorsely scabrous. Leaves cauline. Leaf-sheaths tight; smooth; glabrous on surface. Ligule an eciliate membrane; 1–1.5 mm long. Leaf-blades 10–30 cm long; 3–6 mm wide. Leaf-blade surface smooth.

INFLORESCENCE Inflorescence a panicle. Peduncle scaberulous above.

Panicle open; lanceolate; 5–10 cm long; 1.5–2.5 cm wide. Primary panicle branches 2–6 -nate; 1–3.5 cm long. 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; 3.5–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.66–0.75 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; recurved at apex, or gaping. Lower glume lanceolate; 3–5 mm long; 0.75 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; 3.5–5.5 mm long; 1.4–1.8 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acuminate.

FLORETS Fertile lemma ovate; 2.5–3 mm long; membranous; without keel; 3–5 -veined. Lemma lateral veins extending close to apex. Lemma apex entire; obtuse; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25–0.5 way up back of lemma; straight; 2–3 mm long overall; without a column.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

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

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

NOTES Aveneae. Koyama 1994.

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