Carex sect. Holarrhenae

(Döll) Pax in H. G. A. Engler and K. Prantl

in H. G. A. Engler and K. Prantl, Nat. Planzenfam. 15[II,2]: 124. 1888.

Basionym: Holarrhenae Döll Fl. Baden, 245. 1855
Synonyms: Carex sect. Distichae Rouy
Treatment appears in FNA Volume 23.

Plants not cespitose, long-rhizomatous. Culms brown at base. Leaves: basal sheaths not fibrous; sheath fronts herbacous, not differentiated from backs, distal leaves with sheath fronts green-veined; blades V-shaped in cross-section when young, glabrous. Inflorescences racemose with 9–37 spikes; proximal bracts shortly leaflike, sheathless; spikes androgynous or unisexual, sessile, without prophylls. Proximal pistillate scales with apex obtuse to cuspidate. Perigynia erect, veined on both faces, sessile, broadly ovate, planoconvex, base rounded, margins sharply to narrowly winged, apex abruptly contracted to beak, glabrous; beak 0.4–1.9 (–2.3) mm, with abaxial suture, margins often serrulate, apex slightly bidentate. Stigmas 2. Achenes biconvex, smaller than bodies of perigynia; style deciduous.

Distribution

Temperate regions of Northern Hemisphere

Discussion

Species 2 (2 in the flora).

Selected References

None.

Key

1 Larger perigynia (2.5–)2.8–4.1(–4.6) mm; beak 0.4–1(–1.2) mm; pistillate scales usually pale brown to straw colored at maturity; basal spikes only slightly, if at all, more prominent than middle spikes, inflorescence nearly cylindric except near apex. Carex sartwellii
1 Larger perigynia (3.8–)4–5.5(–6.1) mm; beak (0.8–)1–1.9(–2.3) mm; pistillate scales reddish brown at maturity; basal spikes usually substantially larger than those nearer middle, inflorescence at maturity usually conspicuously contracted towards middle. Carex disticha

"shortened" is not a number.

... more about "Carex sect. Holarrhenae"
biconvex +
smaller +
bidentate;obtuse;cuspidate +
A. A. Reznicek +  and Paul M. Catling +
(Döll) Pax in H. G. A. Engler and K. Prantl +
rounded +
Holarrhenae +
0.19 cm1.9 mm <br />0.0019 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.19 cm1.9 mm <br />0.0019 m <br />) +
v--shaped +
0 cm0 mm <br />0 m <br /> (2 cm20 mm <br />0.02 m <br />) +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
round +  and trigonous +
Temperate regions of Northern Hemisphere +
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 +
sessile +  and veined +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
in H. G. A. Engler and K. Prantl, Nat. Planzenfam. +
adventitious +
basal +  and proximal +
2-keeled +
not differentiated +
cylindric +
unisexual +  and androgynous +
1 +  and 3 +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex sect. Distichae +
Carex sect. Holarrhenae +
section +
plant +  and not cespitose +