Juncus effusus |
Juncus filiformis |
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common bog rush, common rush, common soft rush, pasture rush, soft or lamp rush, soft rush |
thread rush |
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Habit | Herbs, perennial, 4–13 dm. | Herbs, perennial, 0.2–3.5 dm. |
Rhizomes | short -branched, forming distinct, often large clumps. |
widely creeping, sparingly branched, 1.5–2 mm diam., nodes closely set. |
Culms | erect, terete, 1–2.5 mm diam. at top of sheaths. |
terete, 1 mm diam. |
Cataphylls | several. |
several. |
Leaves | blade absent. |
blade absent. |
Inflorescences | lateral, compound dichasia, many flowered; primary bract erect, terete, extending well beyond dichasium. |
3–10(–12)-flowered, loosely congested, 1–2 cm; primary bract terete, nearly equaling to much longer than culm. |
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. |
pedicellate; bracteoles broadly ovate, tepals light brown or green, lanceolate, 2.5–4.2 mm; inner series loosely subtending capsule at maturity, slightly shorter, margins scarious; stamens 6, filaments 0.5–0.9 mm, anthers 0.5–0.7 mm; style 0.2 mm. |
Capsules | greenish tan or darker, 3-locular, broadly ellipsoid to oblate, 1.5–3.2 mm. |
tan, 3-locular, nearly globose, 2.5–3 × 1.8–2.1 mm, shorter than perianth. |
Seeds | amber, (0.3–)0.4–0.5 mm. |
amber, 0.5–0.6 mm, not tailed. |
2n | = 40, 42. |
= 40, 70, 80, 84. |
Juncus effusus |
Juncus filiformis |
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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 | Usually sandy, moist or wet soil along stream banks, pools, lakes or in meadow depressions, rarely in bogs, frequently hidden by larger vegetation |
Elevation | Habitat??; 0–2500 m (Habitat??; 0–8200 ft) | 0–3000 m (0–9800 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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AK; CO; ID; MA; ME; MI; MN; MT; NE; NH; NJ; NY; OR; PA; UT; VT; WA; WI; WV; WY; AB; BC; MB; NB; NL; NS; NT; NU; ON; PE; QC; SK; YT; SPM; Greenland; Eurasia; Atlantic Islands (Iceland)
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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. Genuini |
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 | |
Name authority | Linnaeus: Sp. Pl. 1: 326. (1753) | Linnaeus: Sp. Pl. 1: 326. (1753) |
Web links |
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