Carex douglasii

Boott in W. J. Hooker

in W. J. Hooker, Fl. Bor.-Amer. 2: 213, plate 214. 1839.

Illustrated
Treatment appears in FNA Volume 23. Treatment on page 304. Mentioned on page 303.

Rhizomes 0.8–1.9 mm thick, shoots often arising 2–several per cluster, many nodes without shoots. Culms bluntly trigonous, (8–) 15–40 cm, smooth-angled distally. Leaves: basal sheaths pale to dark-brown; sheaths with hyaline inner band, apex not prolonged, glabrous; ligules 0–2.8 mm; blades 1–3 (–3.5) mm wide. Inflorescences dense, headlike, 1.2–3.5 (–4.5) cm, 1/2+ as wide as long (if pistillate); spikes 6–20 (–25), usually unisexual; staminate spikes lanceoloid; pistillate spikes ovoid. Pistillate scales pale-brown to ± whitish hyaline, hyaline margins, lanceolate to ovate, (4.3–) 4.7–7.5 mm, apex acute to acuminate, satiny to ± dull. Anthers (2.5–) 2.8–3.9 mm, apiculus bristly (30X). Perigynia brown, essentially veinless, usually stipitate, ovate to broadly elliptic, ± planoconvex, (3–) 3.5–4.2 (–4.8) × 1.2–2.1 mm, dull; beak (0.9–) 1.2–1.9 mm, apex hyaline, friable, oblique or obscurely bidentulate.


Phenology: Fruiting Jun–Aug.
Habitat: Prairie, sagebrush grasslands, forest openings, meadows, marsh edges, stream banks, in dry to wet soils, various open, successional and usually moist habitats, tolerant of alkaline soils
Elevation: 500–3500 m

Distribution

V23 528-distribution-map.jpg

Alta., B.C., Sask., Ariz., Calif., Colo., Idaho, Mo., Mont., Nebr., Nev., N.Mex., N.Dak., Oreg., S.Dak., Utah, Wash., Wyo., Mexico (Baja California)

Discussion

The stigmas of Carex douglasii are very long and form a tangled mat that persists essentially until the perigynia mature, giving a distinctive appearance to pistillate inflorescences of the species. Though the plants are uniform in appearance superficially, the perigynia are quite variable in shape and size.

The Missouri locality is an introduction in a railway yard.

Selected References

None.

Lower Taxa

None.

"not prolonged" is not a number.

... more about "Carex douglasii"
biconvex +
smaller +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.39 cm3.9 mm <br />0.0039 m <br />) +
bidentulate +
satiny +  and more or less dull +
A. A. Reznicek +  and Paul M. Catling +
Boott in W. J. Hooker +
shortened +
pale;dark-brown +
not +  and fibrous +
rounded +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
1/4 length of body +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.19 cm1.9 mm <br />0.0019 m <br />) +
v--shaped +
1mm;3mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
not wide +
smooth-angled +  and trigonous +
15 cm150 mm <br />0.15 m <br /> (40 cm400 mm <br />0.4 m <br />) +
Alta. +, B.C. +, Sask. +, Ariz. +, Calif. +, Colo. +, Idaho +, Mo. +, Mont. +, Nebr. +, Nev. +, N.Mex. +, N.Dak. +, Oreg. +, S.Dak. +, Utah +, Wash. +, Wyo. +  and Mexico (Baja California) +
500–3500 m +
stipitate +, veinless +  and veined +
ovate;narrowly ovate planoconvex or biconvex +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Prairie, sagebrush grasslands, forest openings, meadows, marsh edges, stream banks, in dry to wet soils, various open, successional and usually moist habitats, tolerant of alkaline soils +
3.5 cm35 mm <br />0.035 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
0 cm0 mm <br />0 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
0.43 cm4.3 mm <br />0.0043 m <br /> (0.47 cm4.7 mm <br />0.0047 m <br />) +
lanceolate;ovate +
with (1-)3-6(-30) bristles and/or scales +
stipitate +  and veinless +
0.42 cm4.2 mm <br />0.0042 m <br /> (0.48 cm4.8 mm <br />0.0048 m <br />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.42 cm4.2 mm <br />0.0042 m <br />) +
ascending +  and erect +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.21 cm2.1 mm <br />0.0021 m <br />) +
Fruiting Jun–Aug. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
cuspidate;scale-like +
short-awned +  and cuspidate +
in W. J. Hooker, Fl. Bor.-Amer. +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.19 cm1.9 mm <br />0.0019 m <br />) +
adventitious +
pale-brown +  and more or less whitish hyaline +
basal +  and proximal +
2-keeled +
cylindric +
2;several +
Illustrated +
pistillate +  and staminate +
ovoid;lanceoloid +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex douglasii +
Carex sect. Divisae +
species +
plant +, colonial +  and not cespitose +