Carex lenticularis var. dolia
Syst. Bot. Monogr. 7: 62. 1985.
Culms 3–35 cm. Leaf-blades 1.5–2.5 mm wide. Inflorescences: peduncle of proximal spike less than 1 cm; proximal bract redbrown at base, 1–2 mm wide. Spikes: proximal 3–4 spikes pistillate, 0.9–1.5 cm × 2–4 mm; terminal spike gynecandrous. Pistillate scales redbrown or black. Perigynia 5–7-veined on each face, ovoid, 1.8–2.5 × 1.2–1.5 mm; stipe to 0.5 mm; beak redbrown, 0.2 mm.
Phenology: Fruiting Aug–Sep.
Habitat: Gravelly soils on seasonally flooded stream and lakeshores or seeps
Elevation: 1500–3000 m
Alta., B.C., Yukon, Alaska, Mont.
Carex lenticularis var. dolia is an infrequent taxon of high elevations in the northern Rocky Mountains and can be separated from var. lipocarpa by the lax habit, the compact inflorescence, the gynecandrous terminal spike, and the ovoid perigynia. It appears to hybridize with var. lipocarpa in Montana. Carex eleusinoides is similar in inflorescence morphology, but may be distinguished by its red basal sheaths and short, veinless perigynia. The eastern C. rufina is also very similar in inflorescence morphology; it differs in the short, subsessile, ellipsoid perigynia.
"prolonged" is not a number.