Juncus brachycephalus |
Juncus chlorocephalus |
|
---|---|---|
small-head rush |
green head rush |
|
Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, perennial, cespitose, 2–4.5 dm. |
Culms | erect, 1–4 mm diam., smooth. |
erect, terete, 1–3 mm diam., smooth. |
Cataphylls | 1–2, straw-colored to pink, apex acute. |
1, straw-colored or maroon, apex acute. |
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. |
basal 1–2, cauline 2–3; auricles 2–3.5 mm, apex rounded, scarious; blade terete, 2–16 cm × 1–2 mm. |
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. |
single heads (rarely cluster of 2–3 heads), 0.5–2 cm; primary bract erect; heads 15–25-flowered, spheric, 11–14 mm diam. |
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. |
tepals light green to light pink or white, lanceolate, 3.1–4.2 mm, apex obtuse; stamens 6, anthers 2–3 times filament length. |
Capsules | exserted, chestnut to dark brown, imperfectly 3-locular, obconic, 2.4–3.8 mm, apex acute proximal to beak, valves separating at dehiscence. |
included, straw-colored, 1-locular, broadly obovoid to ovoid, 2.2–2.5 mm, apex obtuse, valves separating at dehiscence, fertile throughout or only proximal to middle. |
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
oblong, 0.5 mm, not tailed; body clear yellow-brown. |
2n | = 80. |
|
Juncus brachycephalus |
Juncus chlorocephalus |
|
Phenology | Fruiting summer–early fall. | Fruiting mid summer–fall. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Sandbars, meadows, damp soil in rock outcrops, and talus |
Elevation | 100–200 m (300–700 ft) | 1400–3000 m (4600–9800 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;
|
CA; NV
|
Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Septati |
Sibling taxa | ||
Synonyms | J. canadensis var. brachycephalus | |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Engelmann |
Web links |