Carex swanii

(Fernald) Mackenzie

Bull. Torrey Bot. Club 37: 246. 1910.

Common names: Carex de Swan
IllustratedEndemic
Basionym: Carex virescens var. swanii Fernald Rhodora 8: 183. 1906
Treatment appears in FNA Volume 23. Mentioned on page 483.

Culms 15–75 cm, sparsely pilose. Leaves: ligules longer than wide; blades 1.5–3 mm wide, pilose. Inflorescences: lateral spikes 5–15 (–19) × 2–4 mm, proximal distant; terminal spike gynecandrous, at least 1/2 flowers pistillate, (5–) 11–20 mm. Pistillate scales ovate, 1.3–2.4 × 0.6–1.4 mm, apex acute to acuminate, with awn to 0.5 mm, as long as perigynia. Staminate scales ovate, 2.4–4.1 mm, apex obtuse to acuminate. Anthers 0.7–1.3 (–1.6) mm. Perigynia ascending, obscurely 5–13-veined, obovate-circular, trigonous in cross-section, 1.7–2.4 × 1–1.5 mm, densely pilose; beak absent. Achenes 1.4–1.8 × 0.8–1.1 mm. 2n = 54.


Phenology: Fruiting late spring–early summer.
Habitat: Dry to wet-mesic forests, scrub
Elevation: 0–1000 m

Distribution

V23 889-distribution-map.jpg

N.B., N.S., Ont., Que., Ark., Conn., Del., D.C., Ga., Ill., Ind., Ky., Maine, Mass., Md., Mich., Mo., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., Tenn., Vt., Va., W.Va., Wis.

Discussion

Selected References

None.

Lower Taxa

None.

"shortened" is not a number.

... more about "Carex swanii"
0.14 cm1.4 mm <br />0.0014 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
trigonous +
0.8mm;1.1mm +
stipitate +, veinless +  and veined +
elliptic +  and broadly obovate rounded-trigonous +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
, +  and beakless +
pubescent +  and glabrous +
obtuse;acuminate +
Peter W. Ball +
(Fernald) Mackenzie +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
tapering +  and rounded +
Carex virescens var. swanii +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
v--shaped +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
Carex de Swan +
round +  and trigonous +
15 cm150 mm <br />0.15 m <br /> (75 cm750 mm <br />0.75 m <br />) +
N.B. +, N.S. +, Ont. +, Que. +, Ark. +, Conn. +, Del. +, D.C. +, Ga. +, Ill. +, Ind. +, Ky. +, Maine +, Mass. +, Md. +, Mich. +, Mo. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Pa. +, R.I. +, Tenn. +, Vt. +, Va. +, W.Va. +  and Wis. +
0–1000 m +
0.5 cm5 mm <br />0.005 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
hypogynous +  and subtending +
1.1 cm11 mm <br />0.011 m <br /> (2 cm20 mm <br />0.02 m <br />) +
biconvex +  and trigonous +
Dry to wet-mesic forests, scrub +
prophyllate +, pedunculate +  and pistillate +
1.5 cm15 mm <br />0.015 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
longer than wide +
subentire +  and entire +
with (1-)3-6(-30) bristles and/or scales +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Fruiting late spring–early summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
Bull. Torrey Bot. Club +
adventitious +
staminate +  and pistillate +
basal +  and proximal +
ovate;ovate +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.41 cm4.1 mm <br />0.0041 m <br />) +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
cylindric +
Illustrated +  and Endemic +
1 +  and 3 +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex sect. Virescentes +
Carex swanii +
Carex sect. Porocystis +
species +
plant +  and cespitose +