Carex illota

L. H. Bailey

Mem. Torrey Bot. Club 1: 15. 1889.

IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 346. Mentioned on page 277, 332, 340.

Plants densely cespitose. Culms 15–38 cm. Leaves: sheath summits white-hyaline, green ribbed, U-shaped, occasionally prolonged to 4 mm distal to collar; distal ligules 1–3 (–3.5) mm; blades 2–4 per fertile culm, 4.5–18 cm × 1.5–2.5 mm. Inflorescences nodding, dense, dark or medium brown, 1–1.2 cm × 5.5–10 mm; proximal internode 1.3–3 mm; 2d internode 0.6–1.5 mm; proximal bracts scalelike to bristlelike. Spikes 3–6, usually individually indistinct, ovoid to broadly ovoid, 4.5–6.5 × 2.5–5.5 mm, base and apex acute to rounded; terminal spike without conspicuous staminate base. Pistillate scales dark-brown, usually with pale or green midstripe, ovate, 1.5–2.5 (–3.5) mm, usually shorter, narrower than perigynia, margin occasionally hyaline gold, to 0.4 mm wide, apex obtuse or acute. Perigynia ascending-spreading to spreading, gold to dark-brown, conspicuously 0–7-veined abaxially, conspicuously 0–4-veined adaxially, ovate, planoconvex, 2.6–3.2 × 0.9–1.3 mm, 0.5–0.65 mm thick, margin unwinged, pithlike tissue usually present in proximal perigynia walls; beak medium or dark-brown at tip, often with white-hyaline, cylindric to somewhat flat, abaxial suture with conspicuous white margin, distance from beak tip to achene 1.2–1.6 mm, entire. Achenes ovate to obovate, 1.2–1.5 × 0.8–1 mm, 0.4–0.5 mm thick. 2n = 64


Phenology: Fruiting summer.
Habitat: Marshes, bogs, wet meadows
Elevation: 2100–3700 m

Distribution

V23 595-distribution-map.jpg

Alta., B.C., Calif., Colo., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.

Discussion

Carex illota is unlike all other members of sect. Ovales in having perigynia lacking wings and margins consistently entire from perigynia base to beak tip.

Selected References

None.

Lower Taxa

None.

"+timesaslongasinflorescences" is not declared as a valid unit of measurement for this property."not undefined" is not a number.

... more about "Carex illota"
cylindric to somewhat +
ovate;obovate +
smaller +
0.4mm +  and 0.5mm +
bidentatate +
papillose +
Joy Mastrogiuseppe +, Paul E. Rothrock +, A. C. Dibble +  and A. A. Reznicek +
L. H. Bailey +
shortened +
persistent +
conspicuous +
acute +  and rounded +
not enlarged +
medium +
4.5 cm45 mm <br />0.045 m <br /> (18 cm180 mm <br />0.18 m <br />) +
2 (?) +  and 4 (?) +
v--shaped +
1.5mm;2.5mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
round +  and trigonous +
15 cm150 mm <br />0.15 m <br /> (38 cm380 mm <br />0.38 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Alta. +, B.C. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, Oreg. +, Utah +, Wash. +  and Wyo. +
2100–3700 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Marshes, bogs, wet meadows +
brown +, medium +  and dark +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
not prophyllate +, sessile +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
white +  and hyaline gold +
conspicuous +
0mm +  and 0.4mm +
green +  and pale +
with (1-)3-6(-30) bristles and/or scales +
0-4-veined +  and 0-7-veined +
gold +  and dark-brown +
ascending-spreading +  and spreading +
0.5mm +  and 0.65mm +
Fruiting summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Mem. Torrey Bot. Club +
adventitious +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
basal +  and proximal +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
narrower +
herbaceous +  and membranous +
not differentiated +
cylindric +
Illustrated +  and Endemic +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
ovoid;broadly ovoid +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +  and persistent +
2-3(-4)-fid +
Carex illota +
Carex sect. Ovales +
species +
plant +  and cespitose +