Carex atratiformis


Bull. Torrey Bot. Club 22: 222. 1895.

Common names: Carex atratiforme
Basionym: Carex ovata Rudge Trans. Linn. Soc. London 7: 96, plate 9, fig. 1. 1804,
Synonyms: Carex atrata subsp. atratiformis (Britton) Kükenthal Carex atratiformis subsp. raymondii (Calder) A. E. Porsild Carex raymondii
Treatment appears in FNA Volume 23. Treatment on page 404. Mentioned on page 403, 405.

Plants loosely cespitose. Culms 20–70 cm, distally finely scabrous. Leaves 2.5–5 mm wide. Inflorescences: proximal bracts shorter than or exceeding inflorescences; spikes distinct, spreading or the proximal pendent and often separate, elongate, 10–25 × 5–8 mm; lateral 3–6 spikes pistillate, long-pendunculate; terminal spike gynecandrous. Pistillate scales light to dark brown with hyaline margins, lanceolate, longer than and as broad as perigynia, midvein same color as body, inconspicuous or lighter in color, conspicuous, raised, prominent, sometimes short-mucronate. Perigynia ascending, yellow brown or chestnut, veinless, ovate or elliptic, 2.5–3 × 1.5–1.75 mm, apex abruptly beaked, distally papillose; beak 0.4–0.5 mm, bidentate, smooth. Achenes filling proximal 1/2 or less of perigynia.

Phenology: Fruiting Jun–Aug.
Habitat: Forest margins, open woodlands, calcareous ledges, stream banks, lakeshores, wet cliffs, high elevation seeps
Elevation: 10–1500 m


V23 723-distribution-map.jpg

Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Ont., Que., Sask., Yukon, Alaska, Maine, Mich., N.H., N.Y., Vt.


Carex raymondii is a minor variant consisting of specimens with yellow-brown perigynia and light brown scales with midribs lighter in color than the bodies of the scales. The hybrid taxon Carex ×quirponensis Fernald (= C. atratiformis × C. norvegica) is known from Newfoundland and Quebec.

Selected References


Lower Taxa

... more about "Carex atratiformis"
David F. Murray +
Britton +
Carex ovata +
Carex atratiforme +
Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. +, N.W.T. +, N.S. +, Ont. +, Que. +, Sask. +, Yukon +, Alaska +, Maine +, Mich. +, N.H. +, N.Y. +  and Vt. +
10–1500 m +
Forest margins, open woodlands, calcareous ledges, stream banks, lakeshores, wet cliffs, high elevation seeps +
Fruiting Jun–Aug. +
Bull. Torrey Bot. Club +
Illustrated +  and Endemic +
Carex atrata subsp. atratiformis +, Carex atratiformis subsp. raymondii +  and Carex raymondii +
Carex atratiformis +
Carex sect. Racemosae +
species +