Juncus alpinoarticulatus

Chaix

in D. Villars, Hist. Pl. Dauphiné 1: 378. 1786.

Common names: Alpine rush
Synonyms: Juncus alpinus Villars Juncus. alpinoarticulatus subsp. americanus (Farwell) Hämet—Ahti Juncus. alpinoarticulatus subsp. fuscescens (Fernald) Hämet—Ahti Juncus. alpinus var. americanus Farwell Juncus. alpinus Schultes Juncus. alpinus var. fuscescens Fernald Juncus. alpinus var. insignis Fries ex Buchenau Juncus. alpinus subsp. nodulosus (Wahlenberg) Lindman Juncus. alpinus var. rariflorus (Hartman) Hartmann Juncus. nodulosus Juncus. rariflorus Juncus. richardsonianus
Treatment appears in FNA Volume 22. Treatment on page 254. Mentioned on page 255.

Herbs, perennial, rhizomatous, 0.5–5 dm. Rhizomes 2–4 mm diam., not swollen. Culms erect, terete, 1–3 mm diam., smooth. Cataphylls 0–1, straw-colored or maroon, apex acute. Leaves: basal 0–2, cauline 1–2(–5); auricles 0.5–1.2 mm, apex rounded, scarious; blade green to straw-colored, terete, 1.5–12 cm × 0.5–1.1 mm. Inflorescences terminal panicles of 5–25 heads, 3–11 cm, branches erect to ascending; primary bract erect; heads 2–10-flowered, obpyramidal, usually with some flowers short- pedicellateled, 2–6 mm in diam. Flowers: tepals greenish to straw-colored, lanceolate to oblong; outer tepals 1.8–3 mm, apex obtuse, mucronate; inner tepals 1.6–2.7 mm, apex obtuse; stamens 6, anthers 1/2 filament length. Capsules equaling perianth to usually exserted, chestnut brown to straw-colored, imperfectly 3-locular, oblong to oblong-ovoid, 2.3–3.5 mm, apex obtuse, valves separating at dehiscence. Seeds oblong to ovoid, 0.5–0.7 mm, not tailed. 2n = 40.


Phenology: Fruiting mid summer–fall.
Habitat: Wet meadows, sandy and gravelly, often calcareous shores, fens, and clayey pools over rock
Elevation: 0–2600 m

Distribution

V22 213-distribution-map.jpg

Greenland, Alta., B.C., Man., N.B., Nfld. and Labr., N.S., N.W.T., Ont., P.E.I., Que., Sask., Yukon, Alaska, Colo., Idaho, Ill., Ind., Iowa, Maine, Mich., Minn., Mo., Mont., Nebr., N.Y., N.Dak., Ohio, Pa., S.Dak., Utah, Vt., Wash., Wis., Eurasia.

Discussion

Several attempts have been made to separate subspecies or varieties of this widespread and variable species. In one study, five varieties were recognized, with four in North America (B. Lindquist 1932) . In another, at least six subspecies were recognized with two in North America (L. Hämet-Ahti 1986). The variation we.have encountered does not fit nicely into the subspecies Hämet-Ahti has recognized, and until a full account of the variation throughout the range of the species is presented, we are not recognizing subspecific or varietal divisions of this species. Recent evidence suggests that this species may be one of the parents of the tetraploid Juncus articulatus. Juncus alpinus hybridizes with J. brevicaudatus (= J. × gracilescens J. Hermann), J. articulatus (= J. × alpiniformis Fernald), J. nodosus (= J. × nodosiformis Fernald), and J. torreyi (= JuncusJ. ×stuckeyi Reinking).

Selected References

None.

Lower Taxa

None.
... more about "Juncus alpinoarticulatus"
Ralph E. Brooks* +  and Steven E. Clemants* +
Alpine rush +
Greenland +, Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. +, N.S. +, N.W.T. +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Alaska +, Colo. +, Idaho +, Ill. +, Ind. +, Iowa +, Maine +, Mich. +, Minn. +, Mo. +, Mont. +, Nebr. +, N.Y. +, N.Dak. +, Ohio +, Pa. +, S.Dak. +, Utah +, Vt. +, Wash. +, Wis. +  and Eurasia. +
0–2600 m +
Wet meadows, sandy and gravelly, often calcareous shores, fens, and clayey pools over rock +
Fruiting mid summer–fall. +
in D. Villars, Hist. Pl. Dauphiné +
Juncus alpinus +, Juncus. alpinoarticulatus subsp. americanus +, Juncus. alpinoarticulatus subsp. fuscescens +, Juncus. alpinus var. americanus +, Juncus. alpinus +, Juncus. alpinus var. fuscescens +, Juncus. alpinus var. insignis +, Juncus. alpinus subsp. nodulosus +, Juncus. alpinus var. rariflorus +, Juncus. nodulosus +, Juncus. rariflorus +  and Juncus. richardsonianus +
Juncus alpinoarticulatus +
Juncus subg. Septati +
species +