Carex sect. Rostrales

Meinshausen

Trudy Imp. S.-Petersburgsk. Bot. Sada 18: 283. 1901.

Synonyms: Carex sect. Folliculatae Mackenzie
Treatment appears in FNA Volume 23.

Plants cespitose, rhizomatous. Culms yellowish or brown, without trace of red or purple at base. Leaves: basal sheaths fibrous or not; sheath fronts membranous; blades M-shaped in cross-section when young, glabrous. Inflorescences racemose, with 2–6 spikes; proximal bracts leaflike, sheathing, sheath 4+ mm, longer than diameter of stem; lateral spikes pistillate or distal lateral spike androgynous, pedunculate, prophyllate; terminal spike staminate. Proximal pistillate scales with 5–7-veined center, apex acute to awned. Perigynia spreading to somewhat reflexed, rarely ascending, veined, stipitate, ovate or lanceolate, round or rounded-trigonous in cross-section, base round-tapering, apex tapering or, rarely, contracted to beak, glabrous; beak, when present, bidentate, teeth erect. Stigmas 3. Achenes brown, oblong-ovoid or ovoid, trigonous, smaller than bodies of perigynia, smooth; style persistent.

Distribution

e North America, e Asia, one species extending to tropical mountains of se Asia

Discussion

Species 5 (4 in the flora).

Selected References

None.

Key

1 Perigynia ovate to narrowly ovate, 2.6–3.9 times as long as wide, 6.4–10.7 mm, apex contracted; beak 1.3–3 mm. Carex turgescens
1 Perigynia lanceolate, 4–7 times as long as wide, (8.3–)10.5–15.6 mm, apex gradually tapered, bidentulate; beak absent. > 2
2 Widest leaf blades 1.6–3.5(–4.2) mm wide; bract sheaths concave at apex; anthers 1.1– 2.7 mm. Carex michauxiana
2 Widest leaf blades (3.5–)5–18 mm wide; bract sheaths prolonged, truncate to convex at apex; anthers 3–5 mm. > 3
3 Larger achenes 3.4–4(–4.5) mm, (1.7–)1.8–2.4 times as long as wide; lateral spikes entirely pistillate (occasionally a few empty scales at apex), the proximal usually arching or nodding; widest leaves of vegetative shoots 8–18(–21) mm wide; proximal pistillate scales mostly 2/3 as long as to slightly longer than perigynia. Carex folliculata
3 Larger achenes 2.3–3.4(–3.8) mm, 1.3–1.8 times as long as wide; lateral spikes usually with conspicuous staminate apex, erect or spreading; widest leaves of vegetative shoots (3.5–)5–12 mm wide; proximal pistillate scales mostly 1/2–2/3 as long as perigynia. Carex lonchocarpa
... more about "Carex sect. Rostrales"
trigonous;ovoid;oblong-ovoid +
smaller +
A. A. Reznicek +
Meinshausen +
shortened +
not +  and fibrous +
round-tapering +
bidentate +
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 +
brown +  and yellowish +
round +  and trigonous +
prophyllate +  and pedunculate +
e North America +, e Asia +  and one species extending to tropical mountains of se Asia +
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 +
stipitate +  and veined +
ascending +, reflexed +  and spreading to somewhat +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
sheathing +  and leaflike +
Trudy Imp. S.-Petersburgsk. Bot. Sada +
adventitious +
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. Folliculatae +
Carex sect. Rostrales +
section +
purple +  and red +
plant +  and cespitose +