Juncus alpinoarticulatus |
Juncus orthophyllus |
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alpine rush, northern green rush, northern rush |
straight-leaf rush |
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Habit | Herbs, perennial, rhizomatous, 0.5–5 dm. | Herbs, perennial, 2–4 dm. |
Rhizomes | 2–4 mm diam., not swollen. |
creeping. |
Culms | erect, terete, 1–3 mm diam., smooth. |
compressed. |
Cataphylls | 0–1, straw-colored or maroon, apex acute. |
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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. |
basal several, cauline 0–3; auricles, if present, 0.5–1 mm, apex acutish; blade flat, basal 10–40 cm × 1–6 mm, cauline blade reduced. |
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. |
glomerules, usually 3–12, each with 5–10 flowers, open; primary bract much shorter than inflorescence. |
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. |
tepals brown, lanceolate, 5–6 mm, apex obtuse; outer series shorter, margins scarious, apex acute, minutely papillose; inner series with margins clear; stamens 6, filaments 0.5–1 mm, anthers 1.6–2.4(–3) mm; style 0.5–2 mm. |
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. |
tan, 3-locular, obovoid, 3–5 mm, shorter than perianth. |
Seeds | oblong to ovoid, 0.5–0.7 mm, not tailed. |
ovoid, 0.6 mm, not tailed. |
2n | = 40. |
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Juncus alpinoarticulatus |
Juncus orthophyllus |
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Phenology | Fruiting mid summer–fall. | Flowering and fruiting late spring to summer. |
Habitat | Wet meadows, sandy and gravelly, often calcareous shores, fens, and clayey pools over rock | Moist ground in mountain meadows |
Elevation | 0–2600 m (0–8500 ft) | 1200–3500 m (3900–11500 ft) |
Distribution |
AK; CO; IA; ID; IL; IN; ME; MI; MN; MO; MT; ND; NE; NY; OH; PA; SD; UT; VT; WA; WI; AB; BC; MB; NB; NL; NS; NT; ON; PE; QC; SK; YT; Greenland; ; Eurasia
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CA; ID; MT; NV; OR; WA; BC
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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). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 22, p. 254. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Graminifolii |
Sibling taxa | ||
Synonyms | J. alpinus, J.. alpinoarticulatus subsp. americanus, J.. alpinoarticulatus subsp. fuscescens, J.. alpinus var. americanus, J.. alpinus, J.. alpinus var. fuscescens, J.. alpinus var. insignis, J.. alpinus subsp. nodulosus, J.. alpinus var. rariflorus, J.. nodulosus, J.. rariflorus, J.. richardsonianus | J. longistylis var. latifolius, J. latifolius |
Name authority | Chaix: in D. Villars, Hist. Pl. Dauphiné 1: 378. (1786) | Coville: Contributions from the U. S. National Herbarium 4: 207. (1893) |
Web links |
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