Deyeuxia lapponica

HABIT Perennial; caespitose. Rhizomes short. Culms erect; 27–80 cm long. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 2–4 mm long. Leaf-blades flat, or involute; 5–15 cm long; 2–4 mm wide. Leaf-blade surface ribbed; smooth, or scaberulous.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth, or scaberulous above.

Panicle contracted; oblong; 7–15 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.5–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.75–1 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 4.5–5.5 mm long; 1.3–1.6 length of adjacent fertile lemma; membranous; purple; 1-keeled; 1–3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 3–3.5 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.33–0.5 way up back of lemma; straight, or curved; 1.5 mm long overall; not or scarcely exserted from spikelet. Rhachilla extension 0.5 mm long; pilose.

FLOWER Lodicules 2. Anthers 3; 1.5–2.1 mm long. Stigmas 2.

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

DISTRIBUTION Europe: northern and eastern. Asia-temperate: Siberia, Soviet far east, China, Mongolia, and eastern Asia. North America: Subarctic, western Canada, and eastern Canada.

NOTES Aveneae. Fl Alaska 1994.

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