Juncus acuminatus

Michaux

Flora Boreali-Americana 1: 192. 1803.

Common names: Sharp-fruited rush
Illustrated
Synonyms: Juncus acuminatus var. legitimus Engelmann Juncus pallescens A. W. Wood Juncus pondii
Treatment appears in FNA Volume 22.

Herbs, perennial, cespitose, not rhizomatous, 1.4–10 dm. Culms erect, terete, 1–3 mm diam., smooth. Cataphylls 1–2, gray, apex acute. Leaves: basal 1–2, cauline 1–2; auricles 1–1.5 mm, apex rounded, scarious; blade green, straw-colored, or pink, nearly terete, 1–40 cm. Inflorescences terminal panicles of 5–50 heads, 5–15 cm, branches ascending; primary bract erect; heads (2–)5–20(–50)-flowered, hemispheric (to spheric), 3–10 mm diam. Flowers: tepals light brown to greenish, lanceolate, 2.6–3.5(–3.9) mm, apex acuminate; stamens 3 (or 6), anthers 1/3 filament length. Capsules equaling perianth or slightly exserted, straw-colored, 1-locular, ellipsoid to narrowly ovoid, 2.8–3.5(–4) mm, apex acute, valves separating at dehiscence, fertile throughout or only proximal to middle. Seeds ellipsoid to oblong, 0.3–0.4 mm, not tailed; body clear yellow-brown. 2n = 40.


Phenology: Fruiting early summer–fall.
Habitat: Shores, swamps, ditches, springs, wet meadows, and rock outcrops
Elevation: 0–2200 m

Distribution

V22 301-distribution-map.jpg

B.C., N.S., Ont., Que., Ala., Ariz., Ark., Calif., Colo., Conn., Del., D.C., Fla., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Mont., Nebr., N.H., N.J., N.Mex., N.Y., N.C., Ohio., Okla., Oreg., Pa., R.I., S.C., Tenn., Tex., Vt., Va., Wash., W.Va., Wis., Mexico, Central America (Honduras).

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Juncus acuminatus"
Ralph E. Brooks* +  and Steven E. Clemants* +
Michaux +
Sharp-fruited rush +
B.C. +, N.S. +, Ont. +, Que. +, Ala. +, Ariz. +, Ark. +, Calif. +, Colo. +, Conn. +, Del. +, D.C. +, Fla. +, Ga. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Mont. +, Nebr. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, Ohio. +, Okla. +, Oreg. +, Pa. +, R.I. +, S.C. +, Tenn. +, Tex. +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +, Mexico +  and Central America (Honduras). +
0–2200 m +
Shores, swamps, ditches, springs, wet meadows, and rock outcrops +
Fruiting early summer–fall. +
Flora Boreali-Americana +
Illustrated +
Juncus acuminatus var. legitimus +, Juncus pallescens +  and Juncus pondii +
Juncus acuminatus +
Juncus subg. Septati +
species +