Carex stevenii

(T. Holm) Kalela

Ann. Bot. Soc. Zool.-Bot. Fenn. “Vanamo” 19(3): 11. 1944.

IllustratedEndemic
Basionym: Carex alpina var. stevenii T. Holm Amer. J. Sci. 166: 27. 1903
Synonyms: Carex anagare var. stevenii (T. Holm) A. E. Porsild Carex media var. stevenii (T. Holm) Fernald Carex norvegica var. stevenii (T. Holm) Dorn Carex norvegica subsp. stevenii (T. Holm) D. F. Murray Carex vahlii var. stevenii (T. Holm) Fernald
Treatment appears in FNA Volume 23. Mentioned on page 406.

Plants loosely cespitose. Culms 15–60 cm, distally finely scabrous. Leaves 3–4 mm wide. Inflorescences: proximal bracts shorter than or exceeding inflorescences; spikes overlapping, distinct, contiguous, short-oblong or cylindric, 5–15 × 3–4.5 mm; lateral 2–3 spikes pistillate; proximal spikes separate, erect, short-pendunculate; distal lateral contiguous or separate, not forming dense terminal cluster, of similar length; terminal spike gynecandrous. Pistillate scales dark-brown to black, margins hyaline, ovate, shorter than and as broad as perigynia, midvein same color as body, inconspicuous. Perigynia ascending, green becoming dark-brown or purple-black, veinless, elliptic, 2–2.5 × 1.25–1.5 mm, frequently serrulate, apex abruptly or gradually beaked, smooth or distal margins sparsely papillose; beak 0.2–0.3 mm, shallowly bidentate, serrulate or smooth. Achenes nearly filling body of perigynia.


Phenology: Fruiting Jun–Aug.
Habitat: Open forests, moist meadows, stream banks, occasionally reaching lower alpine tundra (Colorado)
Elevation: 2400–3500 m

Distribution

V23 729-distribution-map.jpg

Colo., Idaho, Mont., N.Mex., Utah, Wyo.

Discussion

The illustration in K. K. Mackenzie (1940) as Carex vahlii is C. stevenii. Although morphologically close to C. norvegica and alternatively treated as a race, C. stevenii is ecologically distinct and geographically distant from C. norvegica.

Selected References

None.

Lower Taxa

None.
... more about "Carex stevenii"
trigonous +
smaller +
papillose +  and smooth +
David F. Murray +
(T. Holm) Kalela +
shortened +
cuneate +  and more or less rounded +
Carex alpina var. stevenii +
smooth +  and serrulate +
bidentate +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-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 +
papillose +  and smooth +
red +  and purple +
round +  and trigonous +
15 cm150 mm <br />0.15 m <br /> (60 cm600 mm <br />0.6 m <br />) +
cluster +, separate +  and contiguous +
Colo. +, Idaho +, Mont. +, N.Mex. +, Utah +  and Wyo. +
2400–3500 m +
hypogynous +  and subtending +
biconvex +  and trigonous +
Open forests, moist meadows, stream banks, occasionally reaching lower alpine tundra (Colorado) +
prophyllate +, pedunculate +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
inconspicuous +
with (1-)3-6(-30) bristles and/or scales +
green becoming dark-brown or purple-black +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.125 cm1.25 mm <br />0.00125 m <br /> (0.15 cm1.5 mm <br />0.0015 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 +
short-pendunculate +
Ann. Bot. Soc. Zool.-Bot. Fenn. “Vanamo” +
black without yellowbrown +  and brown +
adventitious +
dark-brown +  and black +
basal +  and proximal +
2-keeled +
cylindric +
Illustrated +  and Endemic +
contiguous +  and overlapping +
distinct +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
cylindric;short-oblong +
0.3 cm3 mm <br />0.003 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
2 +  and 3 +
papillate +
deciduous +
2-3(-4)-fid +
Carex anagare var. stevenii +, Carex media var. stevenii +, Carex norvegica var. stevenii +, Carex norvegica subsp. stevenii +  and Carex vahlii var. stevenii +
Carex stevenii +
Carex sect. Racemosae +
species +
pistillate +  and staminate +
stoloniferous +, rhizomatous +  and long +
plant +  and cespitose +