Calamagrostis sorengii

HABIT Perennial; caespitose; clumped densely. Rhizomes short. Culms erect; 15–50 cm long; 2–3 -noded. Culm-internodes scaberulous. Lateral branches lacking. Leaf-sheaths smooth. Ligule an eciliate membrane; 1.8–7.5 mm long; acute. Leaf-blades flat, or involute; 3.5–11 cm long; 1.4–4.3 mm wide; grey-green. Leaf-blade surface scaberulous; rough abaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; elliptic; equilateral; 3.3–7.8 cm long; 1.1–2.6 cm wide. Primary panicle branches 0.7–2.5 cm long.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.3–8.3 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 2.4–4.5 mm long; 0.6–1 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; gaping. Lower glume lanceolate; 4.3–8.3 mm long; 1 length of upper glume; membranous; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 4.3–6.8 mm long; 1.3–1.4 length of adjacent fertile lemma; membranous; 3 -veined. Upper glume apex acute.

FLORETS Fertile lemma oblong, or ovate; 3.3–5.6 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25–0.75 way up back of lemma; straight, or curved; 1.3–5.4 mm long overall; not or scarcely exserted from spikelet. Palea 2.1–4.4 mm long; 0.6–0.8 length of lemma. Rhachilla extension 1–2.5 mm long; villous; with 3.4–4.5 mm long hairs.

FLOWER Anthers 3; 1.6–2.5 mm long.

DISTRIBUTION Asia-temperate: China.

NOTES Aveneae. Pazko & Chen 2014.

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