Carex arcta

Boott

Ill. Carex, 155, plate 497. 1867.

Common names: Carex dru
IllustratedEndemic
Synonyms: Carex canescens var. oregana L. H. Bailey Carex canescens var. polystachya Boott Carex heleonastes var. scabriuscula Kükenthal Carex kunzei
Treatment appears in FNA Volume 23. Treatment on page 321. Mentioned on page 317, 312.

Plants densely cespitose; rhizomes short. Culms erect, slender, 15–80 cm, very rough distally. Leaves: sheaths pale to graybrown abaxially, inner band thin, hyaline, conspicuously purplish dotted, concave at summit; ligules acute, longer than wide; blades pale to gray-green, flat, 15–50 cm × 2–4 mm, shorter than to exceeding culms. Inflorescences erect, ovoid-oblong, 1.5–4 cm × 7–12 mm; proximal bracts (sometimes also 2d) bristlelike-prolonged, from short to clearly exceeding spikes, distal bracts usually scalelike. Spikes 5–15, gynecandrous, proximal often slightly separate, distal closely approximate (sometimes hardly recognizable), containing 10–20 perigynia, sessile, oblong, 5–10 × 4–6 mm. Pistillate scales hyaline with green center, often brown tinged, ovate, shorter than perigynia, apex obtuse to short-cuspidate. Perigynia spreadingascending, greenish, often brown in age, several-veined, ovate, widest near base, 2–3 (–3.5) × 1.25–1.5 mm, minutely papillose (membranous); beak abaxial suture conspicuous, 0.75–1.25 mm, margin serrulate. Achenes pale-brown, ovate, 1.25–1.5 1 mm, dull to slightly glossy. 2n = 60.


Phenology: Fruiting Jun–Sep.
Habitat: Swampy (coniferous) woods and thickets, wet meadows
Elevation: 0–2000 m

Distribution

V23 567-distribution-map.jpg

Alta., B.C., Man., N.B., Ont., Que., Yukon, Calif., Idaho, Maine, Mass., Mich., Minn., Mont., N.H., N.Y., Oreg., Vt., Wash., Wis.

Discussion

Selected References

None.

Lower Taxa

None.

"widest" is not a number."bristlelike-prolonged" is not a number.

... more about "Carex arcta"
0.075 cm0.75 mm <br />7.5e-4 m <br /> (0.125 cm1.25 mm <br />0.00125 m <br />) +
dull +  and slightly glossy +
smaller +
beaked +  and beakless +
papillose +  and smooth +
Heikki Toivonen +
shortened +
truncate +  and rounded +
1.25mm;1.5mm +
inconspicuous +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
pale +  and gray-green +
15 cm150 mm <br />0.15 m <br /> (50 cm500 mm <br />0.5 m <br />) +
v--shaped +
2mm;4mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
Carex dru +
round +  and trigonous +
slender +
15 cm150 mm <br />0.15 m <br /> (80 cm800 mm <br />0.8 m <br />) +
0.5 cm5 mm <br />0.005 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 />) +
Alta. +, B.C. +, Man. +, N.B. +, Ont. +, Que. +, Yukon +, Calif. +, Idaho +, Maine +, Mass. +, Mich. +, Minn. +, Mont. +, N.H. +, N.Y. +, Oreg. +, Vt. +, Wash. +  and Wis. +
0–2000 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Swampy (coniferous) woods and thickets, wet meadows +
purplish dotted +  and hyaline +
sessile +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
longer than wide +
angled;rounded +
with (1-)3-6(-30) bristles and/or scales +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
brown +  and greenish +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
spreading +  and ascending +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Fruiting Jun–Sep. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
sheathless +  and bristlelike +
Ill. Carex, +
adventitious +
brown tinged +  and hyaline +
basal +  and proximal +
cylindric +
Illustrated +  and Endemic +
gynecandrous +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex canescens var. oregana +, Carex canescens var. polystachya +, Carex heleonastes var. scabriuscula +  and Carex kunzei +
Carex arcta +
Carex sect. Glareosae +
species +
plant +  and cespitose +