Carex sect. Collinsiae

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

in N. L. Britton et al., N. Amer. Fl. 18: 425. 1935.

Basionym: Collinsiae Mackenzie in N. L. Britton and A. Brown, Ill. Fl. N. U.S., ed. 2, 1: 353. 1913
Treatment appears in FNA Volume 23.

Plants cespitose, short-rhizomatous. Culms purple-brown at base. Leaves: basal sheaths not fibrous; sheath fronts membranous only in short obtriangular region at mouth; blades V-shaped in cross-section when young, glabrous. Inflorescences racemose, with 3–5 spikes; proximal bracts leaflike, sheathing, sheath 4+ mm, longer than diameter of stem; lateral spikes androgynous or pistillate, pedunculate, prophyllate; terminal spike staminate. Proximal pistillate scales 1-veined, apex cuspidate or awned. Perigynia spreading or reflexed, many-veined, stipitate, subulate, round in cross-section, base tapered, apex tapered to beak, glabrous; beak straight, 3–4 mm, bidentate, teeth reflexed. Stigmas 3. Achenes linearoblong, smaller than bodies of perigynia; style persistent.

Distribution

e North America

Discussion

Species 1.

Carex collinsii belongs to a monotypic section of uncertain relationships; it has been placed within sections Folliculatae and Lupulinae and considered closely related to section Microglochin. Carex collinsii lacks the entire beak and protruding rachilla characteristic of the latter section. The almost hooked teeth of the perigynium and obliquely cleft beak are not found in any other species of Carex. No intersectional hybrids are reported.

Selected References

None.

Lower Taxa

... more about "Carex sect. Collinsiae"
4-angled;trigonous;planoconvex;trigonous;planoconvex;biconvex +
smaller +
awned +  and cuspidate +
Lisa A. Standley +
(Mackenzie) Mackenzie in N. L. Britton et al. +
shortened +
tapered +
Collinsiae +
straight +
bidentate +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 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 +
purple-brown +
round +  and trigonous +
e North America +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
prophyllate +, pedunculate +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
with (1-)3-6(-30) bristles and/or scales +
stipitate +  and many-veined +
reflexed +  and spreading +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
sheathing +  and leaflike +
in N. L. Britton et al., N. Amer. Fl. +
obtriangular +
adventitious +
1-veined +  and pistillate +
basal +  and proximal +
2-keeled +
cylindric +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
persistent +
2-3(-4)-fid +
Carex sect. Collinsiae +
section +
plant +  and cespitose +