Juncus brachycephalus |
Juncus covillei |
|||||
---|---|---|---|---|---|---|
small-head rush |
Coville's rush |
|||||
Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, perennial, strongly rhizomatous, 0.5–2.5 dm. | ||||
Culms | erect, 1–4 mm diam., smooth. |
erect, slightly flattened. |
||||
Cataphylls | 1–2, straw-colored to pink, 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 2–5, cauline 2–4; auricles absent or, if present, 0.5–1.5 mm, apex acute; blade flat, 5–15 cm × 2–3 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. |
glomerules, 1–6, each with 3–7 flowers, open to aggregate, 2–6 cm; primary bract or distal leaves usually exceeding inflorescences. |
||||
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 usually brown, ovate-oblong, 3–4 mm, margins scarious; inner series slightly shorter, minutely papillate; stamens 6, filaments 0.8–1.4 mm, anthers 0.8–1.4 mm; style 1 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. |
3-locular, narrowly ovoid, 4–5 mm. |
||||
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
narrowly ovoid, 0.3 mm, not tailed. |
||||
2n | = 80. |
|||||
Juncus brachycephalus |
Juncus covillei |
|||||
Phenology | Fruiting summer–early fall. | |||||
Habitat | Calcareous marshes, wet meadows, and wetland shores | |||||
Elevation | 100–200 m (300–700 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; ID; MT; OR; WA; BC; Coastal to montane areas
|
||||
Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|||||
Key |
|
|||||
Source | FNA vol. 22. | FNA vol. 22. | ||||
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Graminifolii | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | J. canadensis var. brachycephalus | J. falcatus var. paniculatus | ||||
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Piper: Contributions from the U. S. National Herbarium 11: 182. (1906) | ||||
Web links |
|