Juncus inflexus


Sp. Pl. 1: 326. 1753.

Common names: Blue rush
Synonyms: Juncus glaucus Ehrhart ex Sibthorp
Treatment appears in FNA Volume 22.

Herbs, perennial, cespitose, stooling, 4–10 (–12) dm. Rhizomes 3–5 mm diam. Culms terete, 1.5–3 mm diam. Cataphylls several. Leaves: blade absent. Inflorescences many flowered, open, 2–7 cm; primary bract terete, 10–25 cm. Flowers pedicellate; bracteoles ovate; tepals straw-colored to reddish brown, lanceolate, 2.7–3.5 mm, margins scarious; inner series loosely subtending capsule at maturity, shorter; stamens 6, filaments 0.8–1.5 mm, anthers 0.8–1 mm; style 0.3 mm. Capsules reddish brown to chestnut brown, 3-locular, 3-gonous-ovoid to widely ellipsoid, 3–4 mm, exceeding perianth. Seeds amber, obovoid, 0.3–0.5 mm, not tailed. 2n = 20, 38, 40.

Phenology: Flowering and fruiting summer.
Habitat: Wet soils along streams, ditches, and on wet, sandy and peaty hillsides


V22 522-distribution-map.jpg

Introduced; Ont., Mich., N.Y., Pa., Va., Europe, Asia, Africa.


Selected References


Lower Taxa

... more about "Juncus inflexus"
Ralph E. Brooks* +  and Steven E. Clemants* +
Linnaeus +
Blue rush +
Ont. +, Mich. +, N.Y. +, Pa. +, Va. +, Europe +, Asia +  and Africa. +
Wet soils along streams, ditches, and on wet, sandy and peaty hillsides +
Flowering and fruiting summer. +
Weedy +  and Introduced +
Juncus glaucus +
Juncus inflexus +
Juncus subg. Genuini +
species +