Deyeuxia nomnov(Calamagrostis obtusata)

HABIT Perennial; caespitose. Rhizomes elongated. Culms erect; 60–150 cm long; 4 -noded. Culm-internodes smooth. Lateral branches sparse. Ligule an eciliate membrane; 2–4 mm long; obtuse. Leaf-blades 20–30 cm long; 3–7 mm wide. Leaf-blade surface pilose; hairy adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle open; linear; 10–25 cm long. Primary panicle branches bearing spikelets almost to the base. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3–4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.33–0.5 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 3–4 mm long; 1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acute. Upper glume lanceolate; 1.3 length of adjacent fertile lemma; membranous; purple; 1-keeled; 3 -veined. Upper glume surface asperulous. Upper glume apex acute.

FLORETS Fertile lemma oblong; 2.5–3 mm long; membranous; without keel; 5 -veined. Lemma surface asperulous. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0–0.1 way up back of lemma; geniculate; 2.5–3 mm long overall; with twisted column. Rhachilla extension 0.5 mm long; pilose.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

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

DISTRIBUTION Europe: eastern. Asia-temperate: Siberia, Soviet far east, and Mongolia.

NOTES Aveneae. Fl Eur 1995.

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