Carex scirpoidea subsp. stenochlaena

(Holm) Á. Löve & D. Löve

Taxon 13: 202. 1964.

IllustratedEndemic
Basionym: Carex scirpoidea var. stenochlaena T. Holm Amer. J. Sci. 168: 20. 1904
Synonyms: Carex stenochlaena
Treatment appears in FNA Volume 23. Treatment on page 552. Mentioned on page 550, 551.

Plants cespitose; rhizomes inconspicuous. Culms lax, 24–34 cm. Leaves: sheaths and bases from previous year’s leaves absent; blades widely V-shaped in cross-section, to 28 cm × 2.5 mm. Scales lanceolate, 3.5 × 1.5 mm. Perigynia lanceolate, (2.8–) 3–4 (–5) × 0.9–1.4 (–1.6) mm, not more than 2.5 times as long as wide, body tightly enveloping proximal 3/4 of achene. Achenes 1.2–2 × 0.8–1 mm.


Phenology: Fruiting late May–Sep.
Habitat: Weakly acidic soils
Elevation: 1600–2600 m

Distribution

V23 1047-distribution-map.jpg

B.C., Yukon, Alaska, Mont., Wash.

Discussion

Carex scirpoidea subsp. stenochlaena is distinguished by lanceolate perigynia that are longer than 3 mm, tapering gradually to a beak, and over 2.5 times as long as wide. The pistillate spikes are clavate, loosely flowered at the base and borne on slender, lax culms (the spikes droop). The pistillate scales are longer than 3 mm and subtend hirsute perigynia.

Specimens of Carex scirpoidea subsp. stenochlaena from the Bitterroot Range in Ravalli County, Montana, best characterize the subspecies. Some specimens from Washington and northern British Columbia exhibit tendencies towards C. scirpoidea subsp. scirpoidea, in which perigynia are just 2.5 times as long as wide and spikes are less clavate, more loosely flowered.

Carex scirpoidea subsp. stenochlaena from British Columbia and Yukon have a tendency to intergrade with subsp. scirpoidea.

Selected References

None.

Lower Taxa

None.
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
trigonous +
smaller +
0.8mm;1mm +
Debra A. Dunlop +
(Holm) Á. Löve & D. Löve +
shortened +
not +  and fibrous +
rounded +  and tapering +
Carex scirpoidea var. stenochlaena +
bidentate +  and emarginate +
0.1 cm1 mm <br />0.001 m <br /> (?) +
0 cm0 mm <br />0 m <br /> (28 cm280 mm <br />0.28 m <br />) +
v--shaped +
prophyllate +  and sheathless +
2-ranked +  and arranged +
ascending +  and appressed +
filiform +
parallel +  and divergent +
terete +, rolled +  and plicate +
to scale apex +  and midway +
puberulent +  and glabrous +
round +  and trigonous +
24 cm240 mm <br />0.24 m <br /> (34 cm340 mm <br />0.34 m <br />) +
B.C. +, Yukon +, Alaska +, Mont. +  and Wash. +
1600–2600 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Weakly acidic soils +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
acute +  and rounded +
narrow +  and broad +
with (1-)3-6(-30) bristles and/or scales +
stipitate +, veined +  and veinless +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
Fruiting late May–Sep. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
inconspicuous +
adventitious +
redbrown +  and purple +
3.5 cm35 mm <br />0.035 m <br /> (?) +
basal +  and proximal +
lanceolate +
persistent +
cylindric +
Illustrated +  and Endemic +
pistillate +  and staminate +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex stenochlaena +
Carex scirpoidea subsp. stenochlaena +
Carex scirpoidea +
subspecies +
0 cm0 mm <br />0 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
plant +  and cespitose +