Carex aggregata


Bull. Torrey Bot. Club 37: 246. 1910.

Basionym: Carex agglomerata Mackenzie Bull. Torrey Bot. Club 33: 442. 1906,
Synonyms: Carex sparganioides var. aggregata (Mackenzie) Gleason
Treatment appears in FNA Volume 23. Mentioned on page 296.

Plants without conspicuous rhizomes. Culms (20–)30–100 cm, 1.5–3.5 mm wide basally, 0.7–1.2 mm wide distally. Leaves: sheaths usually loose, proximal green-and-white-striped and green-and-white-mottled, with conspicous transverse veins on back, fronts white to hyaline, sometimes red dotted and transversely rugose, yellow or brown and thickened at mouth; ligules 1–4.5 mm, shorter than to as long as wide; widest leaf blades 3.5–5 mm wide. Inflorescences with 5–10 spikes, (1.5–)2–5 cm × 8–13 mm; proximal internodes shorter than to as long as proximal spikes; proximal bracts to 3 cm; spikes with 5–15 ascending to spreading perigynia. Pistillate scales hyaline or pale brown with green, 1–3-veined center, ovate, 2.2–3.5 × 1.2–1.8 mm, body 2/3 as long to almost length of perigynia, apex acuminate to short-awned. Anthers 1.5–2.5 mm. Perigynia pale green to pale brown, veinless or weakly 2–5-veined abaxially, 3.4–4.6 × 1.9–2.8 mm, body somewhat spongy, thickened at base, margins serrulate distally; beak 0.7–1.4 mm, apical teeth 0.3–1 mm. Achenes circular to elliptic-circular, 1.8–2.1 × 1.6–1.8 mm.

Phenology: Fruiting late spring.
Habitat: Meadows, thickets, open forests, usually on calcareous soils
Elevation: 50–300 m


V23 513-distribution-map.jpg

Ont., Ala., Del., D.C., Ill., Ind., Iowa, Ky., Md., Minn., Mo., N.J., N.Y., N.C., Ohio, Okla., Pa., S.Dak., Tenn., Va., W.Va., Wis.


Carex aggregata may be difficult to distinguish from C. gravida if the leaf sheaths are damaged or not visible on specimens.

Selected References


Lower Taxa

... more about "Carex aggregata"
Peter W. Ball +
Mackenzie +
Carex agglomerata +
Ont. +, Ala. +, Del. +, D.C. +, Ill. +, Ind. +, Iowa +, Ky. +, Md. +, Minn. +, Mo. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, S.Dak. +, Tenn. +, Va. +, W.Va. +  and Wis. +
50–300 m +
Meadows, thickets, open forests, usually on calcareous soils +
Fruiting late spring. +
Bull. Torrey Bot. Club +
Illustrated +  and Endemic +
Carex sparganioides var. aggregata +
Carex aggregata +
Carex sect. Phaestoglochin +
species +