Carex oklahomensis


Torreya 14: 126. 1914.

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 red-brown 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


V23 464-distribution-map.jpg

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


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


Lower Taxa

... more about "Carex oklahomensis"
Lisa A. Standley +
Mackenzie +
Vulpinae +
Ark. +, Del. +, Kans. +, Ky. +, Ind. +, Ill. +, Md. +, Miss. +, Mo. +, Okla. +, N.C. +, Tenn. +, Tex. +  and Va. +
0–1500 m +
Seasonally saturated or inundated soils in wet meadows, marshes, alluvial bottomlands +
Fruiting May–Jun. +
Illustrated +  and Endemic +
Carex stipata var. oklahomensis +
Carex oklahomensis +
Carex sect. Vulpinae +
species +