Juncus filiformis |
Juncus bulbosus |
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thread rush |
bulbous rush, spreading rush |
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Habit | Herbs, perennial, 0.2–3.5 dm. | Herbs, perennial, cespitose, often with basal bulblike swellings, occasionally appearing rhizomatous, 0.3–3 dm, to 10 dm when floating or submersed. |
Rhizomes | widely creeping, sparingly branched, 1.5–2 mm diam., nodes closely set. |
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Culms | terete, 1 mm diam. |
erect or decumbent and rooting at nodes, or floating, terete, 1–2 mm diam., smooth. |
Cataphylls | several. |
1, straw-colored, apex acute. |
Leaves | blade absent. |
basal 1, cauline 0–1; auricles 0.4–1 mm, apex acute, scarious; blade terete, occasionally filiform, flaccid, forming carpets, 2–10 cm × 0.8–1.4 mm. |
Inflorescences | 3–10(–12)-flowered, loosely congested, 1–2 cm; primary bract terete, nearly equaling to much longer than culm. |
terminal racemes of 1–8(–30) heads, or single head, 2–10 cm, branches erect; primary bract erect; heads 2–6(–15)-flowered, obconic, 4.5–6.5 mm diam. |
Flowers | 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. |
often forming bulbils; tepals pale brown, ovate to lanceolate or inner oblong, 2–3.6 mm, nearly equal, apex acute to obtuse; stamens 3 or 6, anthers 3/4 to equal filament length. |
Capsules | tan, 3-locular, nearly globose, 2.5–3 × 1.8–2.1 mm, shorter than perianth. |
equaling perianth or exserted (to 0.5 mm beyond tepals), chestnut brown, 1-locular, cylindric, 2.5–4 mm, apex obtuse proximal to beak, valves separating at dehiscence. |
Seeds | amber, 0.5–0.6 mm, not tailed. |
ellipsoid, 0.5–0.6 mm, not tailed; body clear yellow-brown. |
2n | = 40, 70, 80, 84. |
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Juncus filiformis |
Juncus bulbosus |
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Phenology | Flowering and fruiting summer. | Fruiting mid summer–early fall. |
Habitat | Usually sandy, moist or wet soil along stream banks, pools, lakes or in meadow depressions, rarely in bogs, frequently hidden by larger vegetation | Margins and siliceous or peaty shores of pools and streams, often floating |
Elevation | 0–3000 m (0–9800 ft) | 0–200 m (0–700 ft) |
Distribution |
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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OR; WA; BC; NF; NS; SPM; Europe; n Africa [Probably introduced in North America] |
Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Genuini | Juncaceae > Juncus > subg. Septati |
Sibling taxa | ||
Synonyms | J. kockii, J. supinus | |
Name authority | Linnaeus: Sp. Pl. 1: 326. (1753) | Linnaeus: Sp. Pl. 1: 327. (1753) |
Web links |
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