Flora of the Canadian Arctic Archipelago

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S.G. Aiken, M.J. Dallwitz, L.L. Consaul, C.L. McJannet, R.L. Boles, G.W. Argus, J.M. Gillett, P.J. Scott, R. Elven, M.C. LeBlanc, L.J. Gillespie, A.K. Brysting, H. Solstad, and J.G. Harris

Deschampsia (P. Beauv.)

Poaceae, Grass family.

Vegetative morphology. Plants 10–30 cm high; caespitose. Only fibrous roots present. Roots white. Ground level or underground stems absent. Aerial stems erect. Leaves mainly basal; alternate; marcescent. Prophylls 1.5–20 mm long; with scabrous veins; lacking pronounced keels. Petioles absent. Sheaths present; persisting; forming a conspicuous build-up at the base of the plant; greyish brown; with the margins fused only in the lower part; sheath collars present. Ligules present; 1.2–5 mm long; membranous; glabrous; lanceolate, or ovate-oblong. Ligule apices acuminate, or acute; entire. Leaves grass-like. Blades 5–80 mm long, 0.3–2.5 mm wide, appressed to the stem or spreading, rolled in bud, linear, flat or involute or folded, veins parallel, midvein similar in size to other veins in the leaf.

Reproductive morphology. Flowering stems circular or oval in cross section. Flowering stems with leaves. Flag leaf sheaths inflated, or not inflated. Inflorescences paniculate; lanceolate, or pyramidal; 1.5–12 cm long; 5–110 mm wide. Inflorescences main axis glabrous, or scabrous. Number of inflorescence branches at lowest node 2–5. Spikelets disarticulating above the glumes; oblong, or lanceolate, or ovate, or obovate; 2.3–15 mm long; 1.1–7 mm wide. Florets per spikelet 2–3 (unless spikelets are proliferating). Two glumes present. First glume 0.8–1.2 × the length of the second glume; 0.7–1 × spikelet length; 2.7–4 mm long; lanceolate; glabrous; margins glabrous; veins 1; apex acuminate, or acute. Second glume 0.4–0.9 × as long as the spikelet; shorter than the lowest floret, or almost as long as, or longer than, the lowest floret; 3–6.8 mm long. Second glume lanceolate, or ovate. Second glume veins 3. Rachilla pronounced between the florets; extending beyond the uppermost floret; internode 0.1–1.6 mm long; internode glabrous, or hairy. Lemma oblong, or lanceolate; 2.8–7 mm long; keeled, or rounded on the back; lemma not strongly inrolled; surface shiny; surface glabrous; veins 5; apex acuminate, or acute, or rounded, or truncate; apex entire, or erose, or lacerate; apex glabrous; awned, or awnless. Awn arising from the tip, or from the middle or below. Awn 0.2–1.4 mm long. Palea well developed, or vestigial, or absent; 0–2.5 mm long; veins glabrous, or scabrous. Flowers bilaterally symmetrical (zygomorphic). Perianth represented by lodicules. Stamens 3. Anthers 1.5–2.5 mm long. Ovary carpels 3; syncarpous. Ovaries glabrous. Styles present (usually); 2. Placentation basal. Ovules per ovary 1. Fruit dry; a caryopsis; 2.3–3 mm long.


This publication is available on the internet (posted May 2011) and on CD-ROM (published in 2007). These versions are identical in content, except that the errata page for CD-ROM is accessible on the main index page of the web version.

Recommended citation for the web-based version of this publication: Aiken, S.G., Dallwitz, M.J., Consaul, L.L., McJannet, C.L., Boles, R.L., Argus, G.W., Gillett, J.M., Scott, P.J., Elven, R., LeBlanc, M.C., Gillespie, L.J., Brysting, A.K., Solstad, H., and Harris, J.G. 2007. Flora of the Canadian Arctic Archipelago: Descriptions, Illustrations, Identification, and Information Retrieval. NRC Research Press, National Research Council of Canada, Ottawa. http://nature.ca/aaflora/data, accessed on DATE.

Recommended citation for the CD-ROM version of this publication: Aiken, S.G., Dallwitz, M.J., Consaul, L.L., McJannet, C.L., Boles, R.L., Argus, G.W., Gillett, J.M., Scott, P.J., Elven, R., LeBlanc, M.C., Gillespie, L.J., Brysting, A.K., Solstad, H., and Harris, J.G. 2007. Flora of the Canadian Arctic Archipelago: Descriptions, Illustrations, Identification, and Information Retrieval. [CD-ROM] NRC Research Press, National Research Council of Canada, Ottawa.

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