Carex oklahomensis

Mackenzie

Torreya 14: 126. 1914.

IllustratedEndemic
Synonyms: Carex stipata var. oklahomensis (Mackenzie) Gleason
Treatment appears in FNA Volume 23. Mentioned on page 276.

Plants with basal sheaths of previous year not persistent. Culms not easily compressed, angles obtuse, to 80 cm × 2 mm, glabrous. Leaves: sheaths of proximal 2–3 leaves bladeless, fronts smooth, indistinctly linearly veined, forming tubular extension distal to sheath-blade junction, apex colorless, fragile, U-shaped, entire; ligules obtuse, 4 mm, free limb to 3 mm; blades not epistomic, to 75 cm × 5 mm. Inflorescences densely spicate, elongate, with 15–20 distinguishable branches, 5–10 × 2.5 cm; proximal internode to 10 mm. Scales pale-brown with hyaline margins. Perigynia pale-brown with redbrown veins, 10–12-veined abaxially, 7-veined adaxially, to 5 × 1.7 mm, base distended proximally, cordate; stipe to 0.2 mm; beak to 2.5 mm, serrulate. Achenes broadly ovate, 1.7 × 1.5 mm; stalk to 0.15 mm; persistent style base cylindric, 0.15 mm.


Phenology: Fruiting May–Jun.
Habitat: Seasonally saturated or inundated soils in wet meadows, marshes, alluvial bottomlands
Elevation: 0–1500 m

Distribution

V23 464-distribution-map.jpg

Ark., Del., Kans., Ky., Ind., Ill., Md., Miss., Mo., Okla., N.C., Tenn., Tex., Va.

Discussion

Although Carex oklahomensis resembles C. stipata in inflorescence and perigynium characteristics, C. oklahomensis is distinguished by its firm, obtuse-angled stems, bladeless basal sheaths, and tubular extension of the smooth sheath fronts.

Northern and eastern records of Carex oklahomensis are mostly recent and the species may be increasing its range.

Selected References

None.

Lower Taxa

None.
... more about "Carex oklahomensis"
1.7 cm17 mm <br />0.017 m <br /> (?) +
smaller +
0 cm0 mm <br />0 m <br /> (80 cm800 mm <br />0.8 m <br />) +
Lisa A. Standley +
Mackenzie +
shortened +
smooth +  and rugose +
membranous +
not persistent +
not +  and fibrous +
cordate +  and distended +
Vulpinae +
0 cm0 mm <br />0 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
not epistomic +
0 cm0 mm <br />0 m <br /> (75 cm750 mm <br />0.75 m <br />) +
v--shaped +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
distinguishable +
parallel +  and divergent +
terete +, rolled +  and plicate +
dark-brown +  and black +
compressed +
Ark. +, Del. +, Kans. +, Ky. +, Ind. +, Ill. +, Md. +, Miss. +, Mo. +, Okla. +, N.C. +, Tenn. +, Tex. +  and Va. +
0–1500 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Seasonally saturated or inundated soils in wet meadows, marshes, alluvial bottomlands +
paniculate +  and racemose +
prophyllate +, sessile +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
4 cm40 mm <br />0.04 m <br /> (?) +
with (1-)3-6(-30) bristles and/or scales +
7-veined +  and 10-12-veined +
0 cm0 mm <br />0 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
ascending +  and spreading +
0 cm0 mm <br />0 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
Fruiting May–Jun. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
scale-like;filiform +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
adventitious +
basal +  and proximal +
2-keeled +
cylindric +
Illustrated +  and Endemic +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0 cm0 mm <br />0 m <br /> (?) +  and 0.02 cm0.2 mm <br />2.0e-4 m <br /> (?) +
0.15 cm1.5 mm <br />0.0015 m <br /> (?) +
deciduous +
2-3(-4)-fid +
Carex stipata var. oklahomensis +
Carex oklahomensis +
Carex sect. Vulpinae +
species +