Juncus brachycephalus |
Juncus filiformis |
|
---|---|---|
small-head rush |
thread rush |
|
Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, perennial, 0.2–3.5 dm. |
Rhizomes | widely creeping, sparingly branched, 1.5–2 mm diam., nodes closely set. |
|
Culms | erect, 1–4 mm diam., smooth. |
terete, 1 mm diam. |
Cataphylls | 1–2, straw-colored to pink, apex acute. |
several. |
Leaves | basal 1–3, cauline 1–2; auricles 0.6–1.5 mm, apex rounded, scarious; blade terete to compressed, 0.2–12 cm × 0.5–2 mm. |
blade absent. |
Inflorescences | panicles of 5–80 heads, 5–25 cm, branches ascending; primary bract erect; heads 2–6-flowered, ellipsoid to obovoid, 2–5 mm diam. |
3–10(–12)-flowered, loosely congested, 1–2 cm; primary bract terete, nearly equaling to much longer than culm. |
Flowers | tepals green to light brown, lanceolate; outer tepals 1.8–2.5 mm, apex obtuse to nearly acute; inner tepals 2–2.8 mm, apex obtuse to nearly acute; stamens 3 or 6, anthers 1/2 filament length. |
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 | exserted, chestnut to dark brown, imperfectly 3-locular, obconic, 2.4–3.8 mm, apex acute proximal to beak, valves separating at dehiscence. |
tan, 3-locular, nearly globose, 2.5–3 × 1.8–2.1 mm, shorter than perianth. |
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
amber, 0.5–0.6 mm, not tailed. |
2n | = 80. |
= 40, 70, 80, 84. |
Juncus brachycephalus |
Juncus filiformis |
|
Phenology | Fruiting summer–early fall. | Flowering and fruiting summer. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Usually sandy, moist or wet soil along stream banks, pools, lakes or in meadow depressions, rarely in bogs, frequently hidden by larger vegetation |
Elevation | 100–200 m (300–700 ft) | 0–3000 m (0–9800 ft) |
Distribution |
AL; CO; CT; GA; IL; IN; MA; ME; MI; MN; NC; ND; NH; NJ; NY; OH; OK; PA; TN; VA; VT; WI; WV; NB; NS; ON; QC;
|
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)
|
Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Genuini |
Sibling taxa | ||
Synonyms | J. canadensis var. brachycephalus | |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Linnaeus: Sp. Pl. 1: 326. (1753) |
Web links |