Carex sect. Obtusatae

(Tuckerman) Mackenzie in N. L. Britton et al.

in N. L. Britton et al., N. Amer. Fl. 18: 180. 1935.

Basionym: Obtusatae Tuckerman Enum. Meth. Caric., 8. 1843
Treatment appears in FNA Volume 23.

Plants not cespitose, long-rhizomatous. Culms redbrown to red-purple at base. Leaves: basal sheaths not or only slightly fibrous; sheath fronts membranous, sheath fronts of distal cauline leaves minutely dotted red to purple; blades V-shaped in cross-section when young, glabrous. Inflorescence 1 spike; bracts absent; spike androgynous. Proximal pistillate scales less than 10 mm, apex acuminate or cuspidate. Perigynia ascending, brown to reddish black, veinless or obscurely veined, broadly elliptic to obovate, terete to rounded-trigonous in cross-section, base rounded-cuneate, apex tapering or rounded to abrupt beak, glabrous; beak 0.5–1 mm, minutely bidentate. Stigmas 3. Achenes rounded-trigonous, almost as large as bodies of perigynia; style deciduous.

Distribution

w and c North America, Eurasia

Discussion

Species 1.

The delimitation of Carex sect. Obtusatae follows T. V. Egorova (1999) who placed C. supina and relatives in sect. Lamprochlaenae (Drejer) L. H. Bailey.

Selected References

None.

Lower Taxa

... more about "Carex sect. Obtusatae"
rounded-trigonous +
David F. Murray +
(Tuckerman) Mackenzie in N. L. Britton et al. +
shortened +
rounded-cuneate +
Obtusatae +
bidentate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
v--shaped +
0mm;20mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
redbrown +  and red-purple +
round +  and trigonous +
w and c North America +  and Eurasia +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
with (1-)3-6(-30) bristles and/or scales +
veined +  and veinless +
brown +  and reddish black +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
in N. L. Britton et al., N. Amer. Fl. +
adventitious +
basal +  and proximal +
2-keeled +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
cylindric +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex sect. Obtusatae +
section +
plant +  and not cespitose +