Carex atratiformis

Britton

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

Common names: Carex atratiforme
IllustratedEndemic
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

Distribution

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.

Discussion

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

None.

Lower Taxa

None.
... more about "Carex atratiformis"
trigonous +
smaller +
papillose +
David F. Murray +
Britton +
shortened +
cuneate +  and more or less rounded +
Carex ovata +
bidentate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
v--shaped +
0mm;20mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
Carex atratiforme +
papillose +  and smooth +
red +  and purple +
round +  and trigonous +
20 cm200 mm <br />0.2 m <br /> (70 cm700 mm <br />0.7 m <br />) +
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 +
hypogynous +  and subtending +
biconvex +  and trigonous +
Forest margins, open woodlands, calcareous ledges, stream banks, lakeshores, wet cliffs, high elevation seeps +
prophyllate +, pedunculate +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
chestnut +  and yellow-brown +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.175 cm1.75 mm <br />0.00175 m <br />) +
Fruiting Jun–Aug. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
scale-like;,;thread-like +
ladder-fibrillose +  and veined +
purple +, tinged red +  and dotted +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Bull. Torrey Bot. Club +
black without yellowbrown +  and brown +
adventitious +
lighter +, inconspicuous +, light +  and dark-brown +
basal +  and proximal +
prominent +, raised +  and conspicuous +
short-mucronate;lanceolate +
cylindric +
Illustrated +  and Endemic +
long-pendunculate +  and pistillate +
distinct +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
2 +  and 3 +
papillate +
deciduous +
2-3(-4)-fid +
Carex atrata subsp. atratiformis +, Carex atratiformis subsp. raymondii +  and Carex raymondii +
Carex atratiformis +
Carex sect. Racemosae +
species +
pistillate +  and staminate +
stoloniferous +, rhizomatous +  and long +
plant +  and cespitose +