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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Agrostis exarata
HABIT Perennial; caespitose. Culms erect; 30–90 cm long. Leaf-sheaths smooth, or antrorsely scabrous. Ligule an eciliate membrane; 3–6 mm long. Leaf-blades 4–15 cm long; 2–6 mm wide. Leaf-blade surface scabrous.
INFLORESCENCE Inflorescence a panicle. Peduncle antrorsely scabrous above.
Panicle contracted; linear; interrupted; 10–18 cm long; 1–3 cm wide. Primary panicle branches appressed, or ascending; 1–4 cm long; bearing spikelets almost to the base. Panicle branches stiff; scabrous.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2.5–3.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous, or pilose.
GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny; gaping. Lower glume lanceolate; 2.5–3.5 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acute, or acuminate. Upper glume lanceolate; 2.5–3.5 mm long; 1.2–1.5 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acute, or acuminate.
FLORETS Fertile lemma oblong; 2 mm long; hyaline; without keel; 5 -veined. Lemma apex muticous, or awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; straight, or geniculate; 5 mm long overall; without a column, or with twisted column. Palea absent or minute.
FLOWER Lodicules 2; membranous. Anthers 3; 0.6 mm long.
FRUIT Caryopsis with adherent pericarp.
DISTRIBUTION Asia-temperate: Soviet far east and eastern Asia. Pacific: southwestern and north-central. North America: Subarctic, western Canada, northwest USA, north-central USA, southwest USA, south-central USA, and Mexico.
NOTES Aveneae. Gr Tex 1993.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
