Juncus brachycephalus |
Juncus validus |
|||||
---|---|---|---|---|---|---|
small-head rush |
roundhead rush |
|||||
Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, perennial, rhizomatous, sometimes to nearly cespitose, 4–10 dm. | ||||
Rhizomes | not tuberous, 2 mm diam. |
|||||
Culms | erect, 1–4 mm diam., smooth. |
erect, terete, 3–5 mm diam., smooth. |
||||
Cataphylls | 1–2, straw-colored to pink, apex acute. |
0. |
||||
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 2–3(–6), cauline 1–4; auricles 1–3 mm, apex acute, membranaceous, absent on proximal leaves; blade green, laterally compressed, 9–70 cm × 2–6 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. |
terminal panicles of 10–30 heads, 10–30 cm, branches spreading; primary bract erect; heads 20–30-flowered, spheric, (10–)12–15 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 green to reddish, lance-subulate, 4–5 mm, apex acuminate; stamens 3, anthers 1/3–1/2 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. |
exserted, straw-colored, 1-locular, subulate, 4–5,5 mm, tapering to subulate tip, valves separating or not 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. |
broadly ellipsoid, 0.5–0.6 mm, not tailed; body clear yellow-brown. |
||||
2n | = 80. |
|||||
Juncus brachycephalus |
Juncus validus |
|||||
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;
|
AL; AR; FL; GA; KS; LA; MO; MS; NC; OK; SC; TN; TX; VA
|
||||
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. Septati | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | J. canadensis var. brachycephalus | J. crassifolius | ||||
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Coville: Bulletin of the Torrey Botanical Club 22:305. (1895) | ||||
Web links |