Juncus filiformis |
Juncus acutiflorus |
|
---|---|---|
thread rush |
sharpflower rush |
|
Habit | Herbs, perennial, 0.2–3.5 dm. | Herbs, perennial, rhizomatous, to 8 dm. |
Rhizomes | widely creeping, sparingly branched, 1.5–2 mm diam., nodes closely set. |
5–6 mm diam., nodes not swollen. |
Culms | terete, 1 mm diam. |
erect, terete, 3 mm diam., smooth. |
Cataphylls | several. |
1, straw-colored, apex acute. |
Leaves | blade absent. |
basal 1, cauline 2; auricles 0.5 mm, apex rounded, cartilaginous; blade 7–45 cm x 1–2 mm, terete, not scabrous. |
Inflorescences | 3–10(–12)-flowered, loosely congested, 1–2 cm; primary bract terete, nearly equaling to much longer than culm. |
terminal panicles of 70–120 heads, 6–10 cm, branches ascending; primary bract erect; heads 3–5(–8)-flowered, obconic, 2–4 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. |
tepals dark reddish brown, lanceolate, apex acuminate to subulate tipte; outer tepals 1.9–2.2 mm; inner tepals 2–2.3 mm; stamens 6, anthers 2 times filament length. |
Capsules | tan, 3-locular, nearly globose, 2.5–3 × 1.8–2.1 mm, shorter than perianth. |
inserted with beak exserted, straw-colored, 1-locular, narrowly ovoid, 2.3–2.4 mm, tapering to subulate tip, valves separating at dehiscence. |
Seeds | amber, 0.5–0.6 mm, not tailed. |
narrowly ovoid, 0.5–0.6 mm, not tailed; body clear yellow-brown. |
2n | = 40, 70, 80, 84. |
|
Juncus filiformis |
Juncus acutiflorus |
|
Phenology | Flowering and fruiting summer. | Fruiting 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 | Wet woods |
Elevation | 0–3000 m (0–9800 ft) | 0–10 m (0–0 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)
|
NF; SPM; Europe; Asia; Africa |
Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Genuini | Juncaceae > Juncus > subg. Septati |
Sibling taxa | ||
Name authority | Linnaeus: Sp. Pl. 1: 326. (1753) | Ehrhart: in G. F. Hoffmann, Deutschl. Fl. 1: 125. (1791) |
Web links |