Carex sect. Chordorrhizae

(Heuffel) Meinshausen

Trudy Imp. S.-Peterburgsk. Bot. Sada 18: 2. 1901.

Basionym: Chordorrhizae Heuffel Flora 27: 529. 1844
Treatment appears in FNA Volume 23.

Plants not cespitose, short-rhizomatous, long-stoloniferous. Culms brown at base. Leaves: basal sheaths not fibrous; sheath fronts membranous; blades M-shaped in cross-section when young, widest more than 1 mm wide, glabrous. Inflorescences capitate or short-ovoid; bracts scalelike, sheathless; spikes 2–7, androgynous, sessile, without prophylls. Proximal pistillate scales with apex obtuse to shortacuminate. Perigynia ascending, strongly veined on both faces, stipitate, oblongovate to broadly elliptic, planoconvex to unequally biconvex in cross-section, 2–4 (–4.5 mm), base rounded, with spongy tissue, margins rounded, apex rounded, abruptly beaked, glabrous; beak 0.3–0.6 mm, less than 1/5 length of body, with abaxial suture, entire or sparsely serrulate, emarginate. Stigmas 2. Achenes biconvex, only slightly smaller than bodies of perigynia; style deciduous.

Distribution

North America, Eurasia

Discussion

Species 1.

Selected References

None.

Lower Taxa

... more about "Carex sect. Chordorrhizae"
biconvex +
only slightly smaller +
A. A. Reznicek +  and Paul M. Catling +
(Heuffel) Meinshausen +
shortened +
rounded +
Chordorrhizae +
emarginate +, serrulate +  and entire +
0 length of body;1/5 length of body +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
m--shaped +
0mm;20mm +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +
parallel +  and divergent +
terete +, rolled +  and plicate +
round +  and trigonous +
North America +  and Eurasia +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
short-ovoid +  and capitate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
with (1-)3-6(-30) bristles and/or scales +
stipitate +  and veined +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
Trudy Imp. S.-Peterburgsk. Bot. Sada +
adventitious +
basal +  and proximal +
2-keeled +
cylindric +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex sect. Chordorrhizae +
section +
long-stoloniferous +  and short-rhizomatous +
plant +  and not cespitose +