Juncus castaneus


Fl. Brit. 1: 383. 1800.

Synonyms: Juncus castaneus var. pallidus (Hooker ex Buchenau) B. Boivin Juncus castaneus subsp. leucochlamys (W. J. Zinger. ex V. I. Kreczetowicz) Hultén Juncus leucochlamys W. J. Zinger ex V. I. Kreczetowicz
Treatment appears in FNA Volume 22.

Herbs, perennial, strongly rhizomatous, 1–4 dm. Culms solitary, 1–2 mm diam. Cataphylls 1–2. Leaves partially cauline, 3–5, auricles absent distally, rounded proximally; blade channeled, to 20 cm, reduced distally. Inflorescences glomerules, 1–3(–5), each with 2–10 flowers; peduncles 0.4–1.5 cm; primary bracts somewhat inflated, usually surpassing inflorescence. Flowers: bracteoles absent; tepals brown or occasionally paler, lanceolate, 4.5–6.6 mm, apex acute to obtuse; inner series slightly shorter; stamens 6, filaments 2.5–3.5 mm, anthers 0.6–1.3 mm; style 1–1.3 mm. Capsules chestnut brown, 3-locular, narrowly oblong, 6.5–8.5 × 1.8–2.3 mm. Seeds pale yellow, fusiform, body 0.6–0.7 mm, tails 0.8–1.1 mm. 2n = 60, 90, 120.

Phenology: Flowering and fruiting late spring–summer.
Habitat: Tundra, subalpine and alpine bogs and meadows, and along streams in gravelly or clayey soils
Elevation: 10–3700 m


V22 451-distribution-map.jpg

Greenland, Alta., B.C., Man., Nfld. and Labr. (Labr.), N.W.T., Nunavut, Ont., Que., Sask., Yukon, Alaska, Colo., Mont., Nev., N.Mex., Utah, Wyo., Europe, Asia.


In southern Alaska some plants with several many-flowered heads and capsules about double the length of the perianth have been referred to the Asian Juncus castaneus subsp. leucochlamys. The distinction, however, seems dubious without further investigation.

Selected References


Lower Taxa

... more about "Juncus castaneus"
Ralph E. Brooks* +  and Steven E. Clemants* +
Greenland +, Alta. +, B.C. +, Man. +, Nfld. and Labr. (Labr.) +, N.W.T. +, Nunavut +, Ont. +, Que. +, Sask. +, Yukon +, Alaska +, Colo. +, Mont. +, Nev. +, N.Mex. +, Utah +, Wyo. +, Europe +  and Asia. +
10–3700 m +
Tundra, subalpine and alpine bogs and meadows, and along streams in gravelly or clayey soils +
Flowering and fruiting late spring–summer. +
Illustrated +
Juncus castaneus var. pallidus +, Juncus castaneus subsp. leucochlamys +  and Juncus leucochlamys +
Juncus castaneus +
Juncus subg. Alpini +
species +