Juncus brachycephalus |
Juncus capillaris |
|
---|---|---|
small-head rush |
hair-stem dwarf rush, hair-stem rush, hairystem dwarf rush, slender stem dwarf rush |
|
Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, annual, cespitose, 0.09–0.6 dm. |
Culms | erect, 1–4 mm diam., smooth. |
to 20. |
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. |
to 2.2 cm. |
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. |
headlike clusters, each with 1–2 flowers; bracts subtending inflorescence 2–4, ovate, inconspicuous, 0.8–1.5 mm, membranous, apex acute. |
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 4–6, chestnut brown to black, 1.8–2.8 × 0.8–1.5 mm; inner series usually slightly longer than outer, apex acuminate to attenuate; stamens 2–3, filaments 0.6–1.1 mm, anthers 0.3–0.4 mm; style 0.1–0.3 mm, stigma 0.4–0.6 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 or apex reddish, 2– or 3-locular, globose to obovoid, 1.2–2 × 1.1–1.5 mm, usually shorter than tepals. |
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
ellipsoid-ovoid, 0.5–0.8 mm. |
n | = 18. |
|
2n | = 80. |
|
Juncus brachycephalus |
Juncus capillaris |
|
Phenology | Fruiting summer–early fall. | Flowering spring–mid summer. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Moist, bare flats, short turf, and mossy areas in meadows, stream banks, and seepage areas on outcrops (usually granite) |
Elevation | 100–200 m (300–700 ft) | 1200–3200 m (3900–10500 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;
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CA; OR |
Discussion | Juncus capillaris occurs in California in the Sierra Nevada and in Oregon in the Steens Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Graminifolii |
Sibling taxa | ||
Synonyms | J. canadensis var. brachycephalus | |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | F. J. Hermann: Leaflets of Western Botany 5: 116. (1948) |
Web links |