Carex xerantica

L. H. Bailey

Bot. Gaz. 17: 151. 1892.

IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 358. Mentioned on page 333, 345, 356, 357, 359.

Plants densely cespitose. Culms 15–70 cm. Leaves: sheaths adaxially white-hyaline, summits U-shaped, occasionally shortly prolonged beyond collar; distal ligules 0.8–1 mm; blades 3–5 per fertile culm, often folded, 3.5–20 cm × 1–3 mm. Inflorescences stiffly erect, open or spikes loosely aggregate, if open, sometimes arching, whitish to pale-brown, 1.5–5 cm × 5–10 mm; proximal internode 5–10 mm; 2d internode 4–8 mm; proximal bracts scalelike to bristlelike, shorter than inflorescences. Spikes 3–5, distant, distinct, ovoid-ellipsoid, 7–14 × 3–8 mm, base tapered to attenuate, apex acute. Pistillate scales whitish to yellowish, with 1-veined, green to gold midstripe, or white almost throughout at maturity, ovate, 4.4–6 mm, longer and as wide as and concealing perigynia, margin hyaline, 0.3–0.7 mm wide, apex acute. Perigynia essentially erect, pale yellowish-brown, often with green beak, 8–10-veined abaxially, veinless or indistinctly 8–10-veined adaxially, ovate to broadly ovate, planoconvex or thickly concavo-convex, 3.8–4.8 × 1.4–2.2 mm, 0.5–0.6 mm thick, margin flat, including wing 0.2–0.4 mm wide, ciliate-serrulate at least on distal body; beak white-hyaline at tip, flat, ± ciliate-serrulate to the bidentate apex, abaxial suture inconspicuous or white-hyaline, distance from beak tip to achene 1.4–2.2 mm. Achenes ovateoblong, 1.7–2.1 × 1.2–1.4 mm, 0.5–0.6 mm thick. 2n = 68.


Phenology: Fruiting late spring–early summer.
Habitat: Dry grasslands, rock outcrops, talus slopes
Elevation: 300–2100 m

Distribution

V23 623-distribution-map.jpg

Alta., B.C., Man., Ont., Sask., Minn., Mont., Nebr., N.Dak., S.Dak., Wyo.

Discussion

Carex xerantica is a rather local, northern species of the Great Plains which has a distinctive pale silvery aspect to the inflorescences.

Much too broad a range has been ascribed previously to this taxon. Reports from the Rocky Mountains are based mostly on misidentifications of Carex petasata and C. tahoensis, both of which differ in having reddish brown pistillate scales and larger perigynia that are distinctly veined adaxially.

Selected References

None.

Lower Taxa

None.

"+timesaslongasinflorescences" is not declared as a valid unit of measurement for this property."not undefined" is not a number.

... more about "Carex xerantica"
biconvex +
smaller +
0.5mm +  and 0.6mm +
bidentatate +
papillose +
Joy Mastrogiuseppe +, Paul E. Rothrock +, A. C. Dibble +  and A. A. Reznicek +
L. H. Bailey +
shortened +
persistent +
tapered +  and attenuate +
not enlarged +
ciliate-serrulate +
3.5 cm35 mm <br />0.035 m <br /> (20 cm200 mm <br />0.2 m <br />) +
3 (?) +  and 5 (?) +
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 +
round +  and trigonous +
15 cm150 mm <br />0.15 m <br /> (70 cm700 mm <br />0.7 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Alta. +, B.C. +, Man. +, Ont. +, Sask. +, Minn. +, Mont. +, Nebr. +, N.Dak. +, S.Dak. +  and Wyo. +
300–2100 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Dry grasslands, rock outcrops, talus slopes +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
not prophyllate +, sessile +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
0.2mm +  and 0.4mm +
green +  and gold +
with (1-)3-6(-30) bristles and/or scales +
8-10-veined +  and veinless +
pale yellowish-brown +
0.5mm +  and 0.6mm +
Fruiting late spring–early summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
adventitious +
white +, whitish +  and yellowish +
basal +  and proximal +
0.44 cm4.4 mm <br />0.0044 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
herbaceous +  and membranous +
not differentiated +
cylindric +
Illustrated +  and Endemic +
open +  and aggregate +
whitish;pale-brown +
distinct +
0.7 cm7 mm <br />0.007 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
ovoid-ellipsoid +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +  and persistent +
2-3(-4)-fid +
prolonged +
u--shaped +
Carex xerantica +
Carex sect. Ovales +
species +
plant +  and cespitose +