Carex backii

Boott in W. J. Hooker

in W. J. Hooker, Fl. Bor.-Amer. 2: 210, plate 209. 1839.

Common names: Back’s sedge carex de Back
IllustratedEndemic
Synonyms: Carex durifolia L. H. Bailey
Treatment appears in FNA Volume 23. Treatment on page 562. Mentioned on page 558, 560.

Culms 1.4–25 cm. Leaves: basal sheaths pale to medium brown; blades dull green to yellowish green, longer than stems, 1.3–5.4 mm wide, coriaceous, margins green, crenulate to scabrous. Lateral spikes 0–3, basal, on erect peduncles. Terminal spikes with staminate portion 2–3-flowered, 2-–3.6 × 0.4–1 mm; pistillate portion 2–7-flowered. Pistillate scales green, margins (2–) 2.5–6.5 mm wide, essentially concealing perigynia, apex acute, distal scales lanceolate to ovate, apex acute. Staminate scales green to pale-brown, ovate to oblong, 1.9–3.5 × 0.8–1.5 mm, margins enfolding scales above, white, often with reddish-brown tinge, apex obtuse. Anthers 0.9–1.3 mm. Perigynia dull green to dark olive green, ellipsoid to ovoid, 4.8–6.6 × 1.9–3.2 mm, loosely enveloping achenes, apex gradually tapering; beak 1.9–2.9 mm, smooth. Stigmas clavate, erect, shorth, thick, minutely papillose. Achenes 2.5–3.2 × 1.6–2.3 mm. 2n = 66.


Phenology: Fruiting spring–summer (late May–late Jul).
Habitat: Dry, rocky, open, or shaded slopes, ridges, and barrens, in hardwood, mixed, or coniferous forests, including pine plantations, on acidic and calcareous substrates
Elevation: 200–2100 m

Distribution

V23 1071-distribution-map.jpg

Alta., B.C., Man., N.B., Ont., Que., Sask., Colo., Maine, Mich., Minn., Mont., N.H., N.J., N.Y., N.Dak., Pa., S.Dak., Vt., Wis., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.

... more about "Carex backii"
0.25 cm2.5 mm <br />0.0025 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
trigonous +
1.6mm;2.3mm +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
William J. Crins +, Robert F. C. Naczi +, A. A. Reznicek +  and Bruce A. Ford +
Boott in W. J. Hooker +
shortened +
pale;medium brown +
tapering +
flattened-triangular +
0.19 cm1.9 mm <br />0.0019 m <br /> (0.29 cm2.9 mm <br />0.0029 m <br />) +
green +  and yellowish green +
v--shaped +
coriaceous +
1.3mm;5.4mm +
smaller +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
Back’s sedge +  and carex de Back +
2 +  and widest +
round +  and trigonous +
1.4 cm14 mm <br />0.014 m <br /> (25 cm250 mm <br />0.25 m <br />) +
lanceolate +  and ovate +
Alta. +, B.C. +, Man. +, N.B. +, Ont. +, Que. +, Sask. +, Colo. +, Maine +, Mich. +, Minn. +, Mont. +, N.H. +, N.J. +, N.Y. +, N.Dak. +, Pa. +, S.Dak. +, Vt. +, Wis. +  and Wyo. +
200–2100 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Dry, rocky, open, or shaded slopes, ridges, and barrens, in hardwood, mixed, or coniferous forests, including pine plantations, on acidic and calcareous substrates +
septate-nodulose +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
stipitate +  and 2-veined +
crenulate +
2.5mm +  and 6.5mm +
with (1-)3-6(-30) bristles and/or scales +
veined +  and veinless +
green +  and dark olive +
0.48 cm4.8 mm <br />0.0048 m <br /> (0.66 cm6.6 mm <br />0.0066 m <br />) +
0.19 cm1.9 mm <br />0.0019 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
Fruiting spring–summer (late May–late Jul). +
2-3(-4)-carpellate +
2-7-flowered +, pistillate +, 2-3-flowered +  and staminate +
3 (?) +  and 1 (?) +
in W. J. Hooker, Fl. Bor.-Amer. +
adventitious +
staminate +  and pistillate +
green +  and pale-brown +
0.19 cm1.9 mm <br />0.0019 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
basal +  and proximal +
ovate;oblong +
0.8mm;1.5mm +
septate-nodulose +
Illustrated +  and Endemic +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillose +
deciduous +
dilated +
Carex durifolia +
Carex backii +
Carex sect. Phyllostachyae +
species +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
plant +  and cespitose +