Carex sect. Triquetrae

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

in N. L. Britton et al., N. Amer. Fl. 18: 215. 1935.

Basionym: Triquetrae L. H. Bailey Proc. Amer. Acad. Arts 22: 127. 1886
Treatment appears in FNA Volume 23.

Plants densely cespitose, short-rhizomatous. Culms brown at base. Leaves: basal sheaths not or slightly fibrous; sheath fronts dotted purple, membranous; blades M-shaped in cross-section when young, adaxial surface with 2 lateral-veins more prominent th an midvein, papillose, glabrous. Inflorescences racemose, with 3–4 spikes; proximal bracts leaflike, sheath to 3.5 cm; lateral spikes pistillate or, sometimes, androgynous with few staminate flowers, pedunculate, prophyllate; terminal spikes staminate. Proximal pistillate scales hyaline, green, or brown, apex acute to cuspidate. Perigynia ascending, obscurely veined or distinctly 6-veined, with 2 strong marginal veins, subsessile to sessile, ovate or obovate, trigonous in cross-section, base rounded-tapering, apex abruptly contracted to beak, pilose; beak 0.2–0.4 mm, orifice emarginate. Stigmas 3. Achenes trigonous, almost as large as bodies of perigynia; styles deciduous.

Distribution

sw United States, nw Mexico

Discussion

Species 1.

Selected References

None.

Lower Taxa

... more about "Carex sect. Triquetrae"
trigonous +
Peter W. Ball +
(L. H. Bailey) Mackenzie in N. L. Britton et al. +
shortened +
rounded-tapering +
Triquetrae +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
m--shaped +
0mm;20mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
round +  and trigonous +
sw United States +  and nw Mexico +
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 +
subsessile +  and sessile +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
in N. L. Britton et al., N. Amer. Fl. +
adventitious +
brown +, green +  and hyaline +
basal +  and proximal +
2-keeled +
cylindric +
0 cm0 mm <br />0 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex sect. Triquetrae +
section +
plant +  and cespitose +