Calamagrostis gigas

HABIT Perennial. Rhizomes short. Culms 80–200 cm long; 5–7 -noded. Culm-internodes smooth, or scaberulous. Leaf-sheaths smooth, or scaberulous; pubescent. Ligule an eciliate membrane; 1–3 mm long; pubescent on abaxial surface. Leaf-blades 20–35 cm long; 4–12 mm wide; stiff. Leaf-blade surface smooth, or scabrous; rough on both sides.

INFLORESCENCE Inflorescence a panicle. Peduncle antrorsely scabrous above.

Panicle open; lanceolate, or ovate; 12–30 cm long; 7–15 cm wide. 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; 4–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.5–0.75 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny. Lower glume lanceolate; 4–6 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; 4–6 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume primary vein scabrous. Upper glume apex acuminate.

FLORETS Fertile lemma ovate; 3.5–5.5 mm long; membranous; without keel; 3–5 -veined. Lemma lateral veins extending close to apex. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.3–0.5 way up back of lemma; straight, or geniculate; 5–6 mm long overall; without a column, or with a straight or slightly twisted column.

FLOWER Lodicules 2. Anthers 3; 2 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; oblong; 2 mm long. Hilum punctiform. Disseminule comprising a floret.

DISTRIBUTION Asia-temperate: eastern Asia.

NOTES Aveneae. Koyama 1994.

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