Juncus effusus |
Juncus regelii |
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common bog rush, common rush, common soft rush, pasture rush, soft or lamp rush, soft rush |
Regel rush, Regel's rush |
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Habit | Herbs, perennial, 4–13 dm. | Herbs, perennial, 2–6 dm. |
Rhizomes | short -branched, forming distinct, often large clumps. |
long creeping. |
Culms | erect, terete, 1–2.5 mm diam. at top of sheaths. |
erect, slightly compressed, never rooting at nodes. |
Cataphylls | several. |
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Leaves | blade absent. |
basal several, cauline 1–3; auricles absent, or essentially so; blade flat, 0.5–3 dm × 1.5–4 mm. |
Inflorescences | lateral, compound dichasia, many flowered; primary bract erect, terete, extending well beyond dichasium. |
glomerules 1–5, each with (8–)10–30 flowers, congested to open, 2–6 cm; primary bract shorter than inflorescence. |
Flowers | tepals tan or darker, usually with greenish midstripe, lanceolate, 1.9–3.5 mm; inner slightly shorter; stamens 3, filaments 0.5–0.8 mm, anthers 0.5–0.8 mm; style 0.2 mm. |
tepals dark brown with green midstripe, lanceolate, 4–6 mm, margins scarious, occasionally papillose; inner series slightly shorter; stamens 6, filaments 1–1.3 mm, anthers 1–1.5 mm; style 0.6 mm. |
Capsules | greenish tan or darker, 3-locular, broadly ellipsoid to oblate, 1.5–3.2 mm. |
tan or darker, 3-locular, obovoid, 3–5 mm, shorter than perianth. |
Seeds | amber, (0.3–)0.4–0.5 mm. |
ovoid, body 0.6–0.8 mm, tails 0.2–0.4 mm. |
2n | = 40, 42. |
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Juncus effusus |
Juncus regelii |
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Phenology | Flowering summer, fruiting summer–fall. | Flowering and fruiting summer. |
Habitat | Swamps and their edges, marshes, moist meadows, and moist or saturated soils, often conspicuous in pasture meadows where it is shunned by grazing animals | Moist to wet meadows in montane or subalpine areas |
Elevation | Habitat??; 0–2500 m (Habitat??; 0–8200 ft) | 540–3000 m (1800–9800 ft) |
Distribution |
AK; AL; AR; AZ; CA; CO; CT; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; NE; NH; NJ; NV; NY; OH; OK; OR; PA; RI; SC; TN; TX; VA; VT; WA; WI; WV; WV; BC; MB; NB; NF; NS; ON; PE; QC
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CA; ID; MT; NV; OR; UT; WA; WY; AB; BC
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Discussion | The Juncus effusus complex has been variously recognized as containing several species or a single species with numerous infraspecific taxa. Unfortunately, North American treatments have dealt primarily with taxa in either the eastern or western portions of the continent. In considering the continent as a whole, little sense can be made of these treatments. The North American J. effusus complex is one that is in obvious need of modern systematic scrutiny. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Genuini | Juncaceae > Juncus > subg. Graminifolii |
Sibling taxa | ||
Synonyms | J. conglomeratus, J. effusus var. brunneus, J. effusus var. caeruleomontanus, J. effusus var. costulatus, J. effusus var. dicipiens, J. effusus var. exiguus, J. effusus var. gracilis, J. effusus var. pylaei, J. effusus var. solutus, J. effusus var. subglomeratus, J. griscomii | J. jonesii |
Name authority | Linnaeus: Sp. Pl. 1: 326. (1753) | Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 414. (1890) |
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