Carex arctiformis

Mackenzie in N. L. Britton et al.

in N. L. Britton et al., N. Amer. Fl. 18: 97. 1931.

IllustratedEndemic
Synonyms: Carex canescens subsp. arctiformis (Mackenzie) Calder & Roy L. Taylor Carex heleonastes var. robustior Kükenthal
Treatment appears in FNA Volume 23. Mentioned on page 319.

Plants densely cespitose, in large clumps; rhizomes short. Culms erect, strict, stoutish (2.5–4 mm at base), (15–) 20–50 cm. Leaves: sheaths pale-brown abaxially, inner band hyaline, concave at summit; ligules slightly longer than wide, acutish; blades pale gray-green to bluish green, flat, 10–30 cm × 2–4 mm, subequal to shorter than culms. Inflorescences 1.5–3 (–4) cm × 8–14 mm; proximal bracts shorter than to exceeding spikes; distal bracts scalelike. Spikes 3–6, gynecandrous, closely approximate, proximal spikes only slightly separate, containing 15–30 perigynia, ovoid to short-oblong, 6–10 × 4–6 mm; terminal spike staminate for less than 1/2 of length, not or scarcely clavate. Pistillate scales dull green-white, often redbrown tinged, midvein green, margins white-hyaline, ovate, subequal to somewhat concealing perigynia, apex cuspidate to acute. Perigynia appressed-ascending, gray-green, sometimes dark-brown in age, obscurely many-veined faces, ovate-elliptic, 2.5–3 × 1.5 mm, widest near middle, membranous; beak nearly entire or few marginal teeth. Achenes yellowbrown, oblong-obovate, 1.5 × 1–1.25 mm, dull to slightly glossy. 2n = 56.


Phenology: Fruiting May–Jun.
Habitat: Sphagnum bogs, other wet places, mostly lowlands
Elevation: 0–50 m

Discussion

Selected References

None.

Lower Taxa

None.

"widest" is not a number.

... more about "Carex arctiformis"
yellowbrown +
1.5 cm15 mm <br />0.015 m <br /> (?) +
dull +  and slightly glossy +
oblong-obovate +
smaller +
1mm;1.25mm +
beaked +  and beakless +
papillose +  and smooth +
Heikki Toivonen +
Mackenzie in N. L. Britton et al. +
shortened +
truncate +  and rounded +
inconspicuous +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
pale gray-green +  and bluish green +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
v--shaped +
subequal +  and shorter +
2mm;4mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
round +  and trigonous +
20 cm200 mm <br />0.2 m <br /> (50 cm500 mm <br />0.5 m <br />) +
B.C. +  and Alaska. +
0–50 m +
many-veined +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
ovate-elliptic +
membranous +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Sphagnum bogs, other wet places, mostly lowlands +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
sessile +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
slightly longer than wide +
white-hyaline +
subequal +
with (1-)3-6(-30) bristles and/or scales +
stipitate +  and veined +
dark-brown +  and gray-green +
appressed-ascending +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Fruiting May–Jun. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
sheathless +  and bristlelike +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
in N. L. Britton et al., N. Amer. Fl. +
adventitious +
redbrown tinged +  and green-white +
basal +  and proximal +
2-keeled +
cylindric +
Illustrated +  and Endemic +
approximate +
gynecandrous +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex canescens subsp. arctiformis +  and Carex heleonastes var. robustior +
Carex arctiformis +
Carex sect. Glareosae +
species +
plant +  and cespitose +