Carex sect. Dornera

Heuffel

Verh. Zool.-Bot. Ges. Wien 8: 217. 1859.

Synonyms: Carex sect. Callistachys (Heuffel) Ascherson & Graebner
Treatment appears in FNA Volume 23.

Plants loosely or densely cespitose, short-rhizomatous; rhizomes dark-brown, stout, sometimes inconspicuous. Culms brown at base. Leaves: basal sheaths not fibrous; sheath fronts membranous; blades V-shaped in cross-section when young, 1.5–4 mm wide, glabrous. Inflorescences a solitary spike; bracts absent; spike androgynous. Proximal pistillate scales deciduous before perigyinia, apex obtuse to acute. Perigynia erect but eventually spreading, proximal somewhat reflexed at maturity, veinless, lanceolate to broadly lanceolate, rounded-trigonous to biconvex, 3–5 mm, base rounded and stipitate, margins rounded, apex tapering to gradually formed beak, somewhat glossy, glabrous; beak less than 2 mm including teeth, obliquely cleft, sometimes slightly bidentate. Stigmas (2–) 3. Achenes usually trigonous, smaller than bodies of perigynia; style deciduous.

Distribution

North America, Eurasia

Discussion

Species 5 (2 in the flora).

Selected References

None.

Key

1 Plants densely cespitose, without conspicuous rhizomes, tuft-forming; leaf blades involute, 0.25–1.5(–2) mm wide. Carex micropoda
1 Plants loosely cespitose, with short, stout rhizomes, mat-forming; leaf blades flat to the tip, (1.5–)2–4 mm wide. Carex nigricans
... more about "Carex sect. Dornera"
trigonous +
smaller +
David F. Murray +
Heuffel +
shortened +
rounded +, lanceolate +  and broadly lanceolate rounded-trigonous +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
bidentate +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 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 +
1.5mm +  and 4mm +
round +  and trigonous +
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 +
spreading +  and erect +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
Verh. Zool.-Bot. Ges. Wien +
inconspicuous +
adventitious +
deciduous +
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. Callistachys +
Carex sect. Dornera +
section +
plant +  and cespitose +