Deyeuxia nomnov2(Calamagrostis sesquiflora)

HABIT Perennial; caespitose; clumped densely. Culms 15–40 cm long. Lateral branches lacking. Leaf-sheaths smooth. Ligule an eciliate membrane; 3–6 mm long; scaberulous on abaxial surface; erose; obtuse. Collar glabrous. Leaf-blades erect; involute; 1.5–3 mm wide. Leaf-blade surface scaberulous; rough abaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear, or lanceolate; interrupted; 4–12 cm long; 1.5–2 cm wide.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 6–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 2–3 mm long; 0.33–0.5 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 primary vein smooth, or scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 6–7 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 1–3 -veined. Upper glume primary vein smooth, or scaberulous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 6–7 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25 way up back of lemma; geniculate; 8–10 mm long overall; with twisted column. Rhachilla extension villous.

FLOWER Lodicules 2; 0.8 mm long. Anthers 3; 2.5 mm long. Stigmas 2.

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

DISTRIBUTION Asia-temperate: Soviet far east. North America: Subarctic.

NOTES Aveneae. Fl Pac NW 1994.

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