Carex umbellata

Schkuhr ex Willdenow

Sp. Pl. 4(1): 290. 1805.

Common names: Carex en ombelle
IllustratedEndemic
Synonyms: Carex abdita E. P. Bicknell Carex microrhyncha Mackenzie
Treatment appears in FNA Volume 23. Treatment on page 538. Mentioned on page 532, 533, 536.

Plants densely cespitose; rhizomes ascending to erect, reddish-brown, 0–5 mm, stout. Culms 3–7.5 (–18) cm, scabrous distally; bases (remnants of old leaves) weakly to strongly fibrous. Leaf-blades pale green, greatly exceeding culms, 1–2.3 (–3.8) mm wide, herbaceous, glabrous abaxially, strongly scabrous to papillose adaxially. Inflorescences with both staminate and proximal spikes; peduncles of basal spikes erect, short-to-elongate, slender; peduncle of staminate spikes 0.7–5.2 (–12.3) mm; proximal nonbasal bracts scalelike, usually shorter than (occasionally equaling) inflorescences. Spikes: proximal pistillate spikes 2–5 (basal spikes 1–3); cauline spikes overlapping with staminate spikes, with (1–) 4–12 perigynia; staminate spikes 4.6–13 × 0.7–2.2 mm. Scales: pistillate scales reddish-brown with narrow white margins, ovate, 2.8–3.9 × 1.5–1.9 mm, equaling or exceeding perigynia, apex acute to acuminate; staminate scales ovate to lanceolate, 3.5–5.1 × 1.1–2.2 mm, apex obtuse to acute. Anthers 1.7–2.2 mm. Perigynia pale green to pale-brown, veinless, obovoid to globose, rarely ellipsoid, obtusely trigonous in cross-section, 2.2–3.2 × 1–1.4 mm; beak straight, pale green to pale-brown, strongly 2-edged, 0.4–1 mm, weakly ciliate-serrulate, apical teeth 0.1–0.2 mm. Stigmas 3. Achenes brown, ellipsoid, obtusely trigonous in cross-section, 1.4–1.7 × 1–1.3 mm. 2n = 30, 32.


Phenology: Fruiting mid Mar–mid Jul.
Habitat: Open, dry to mesic, circumneutral to calcareous, clayey, sandy, and rocky fields, pastures, tall-grass prairies, glades, ridges, slopes, bluffs, dunes, barrens, open deciduous and mixed woodlands, also on serpentine and basalt, often at edges of ant hills
Elevation: 90–300 m

Distribution

V23 1010-distribution-map.jpg

Greenland, B.C., N.B., Nfld. and Labr., N.S., Ont., P.E.I., Que., Sask., Ala., Ark., Ga., Ill., Ind., Kans., Ky., Maine, Md., Mass., Mich., Minn., Miss., Mo., Nebr., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., Tex., W.Va., Wis.

Discussion

Some botanists think Carex microrhyncha should be retained as a distinct species. A revision of the C. umbellata-C. tonsa complex may reveal distinctions; until that work is done, we prefer to combine C. microrhyncha with C. umbellata.

Selected References

None.

Lower Taxa

None.
... more about "Carex umbellata"
0.14 cm1.4 mm <br />0.0014 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
trigonous;ellipsoid +
1mm;1.3mm +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
beaked +, awned +  and cuspidate +
glabrous +  and pubescent +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
William J. Crins +  and Jeff H. Rettig +
Schkuhr ex Willdenow +
shortened +
rounded +  and tapering +
ciliate-serrulate +
straight +
bidentate +  and bent +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
v--shaped +
2mm;4.5mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
Carex en ombelle +
brown +  and red +
round +  and trigonous +
3 cm30 mm <br />0.03 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
Greenland +, B.C. +, N.B. +, Nfld. and Labr. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Ala. +, Ark. +, Ga. +, Ill. +, Ind. +, Kans. +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Nebr. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, R.I. +, Tex. +, W.Va. +  and Wis. +
90–300 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Open, dry to mesic, circumneutral to calcareous, clayey, sandy, and rocky fields, pastures, tall-grass prairies, glades, ridges, slopes, bluffs, dunes, barrens, open deciduous and mixed woodlands, also on serpentine and basalt, often at edges of ant hills +
prophyllate +, pedunculate +, staminate +, , +  and pistillate +
strongly scabrous;papillose +
0.1 cm1 mm <br />0.001 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
with (1-)3-6(-30) bristles and/or scales +
pale green +  and pale-brown +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
Fruiting mid Mar–mid Jul. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
reddish-brown +
ascending +  and erect +
0 cm0 mm <br />0 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
adventitious +
staminate +  and pistillate +
reddish-brown +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.51 cm5.1 mm <br />0.0051 m <br />) +
basal +  and proximal +
ovate;lanceolate +
exceeding perigynia +  and equaling +
1.1mm;2.2mm +
cylindric +
Illustrated +  and Endemic +
staminate +  and pistillate +
0.46 cm4.6 mm <br />0.0046 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0.52 cm5.2 mm <br />0.0052 m <br /> (1.23 cm12.3 mm <br />0.0123 m <br />) +
slender +, short +  and elongate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.52 cm5.2 mm <br />0.0052 m <br />) +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex abdita +  and Carex microrhyncha +
Carex umbellata +
Carex sect. Acrocystis +
species +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
stoloniferous +  and rhizomatous +
plant +  and cespitose +