Juncus brachycephalus |
Juncus bolanderi |
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small-head rush |
Bolander's rush |
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Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, perennial, not cespitose, rhizomatous, 2.5–8.5 dm. |
Rhizomes | 2–3 mm, tuberous. |
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Culms | erect, 1–4 mm diam., smooth. |
erect, terete, 1–3 mm diam., smooth. |
Cataphylls | 1–2, straw-colored to pink, apex acute. |
1–2, straw-colored, 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 0–1, cauline 2–3, auricles 2–3 mm, apex acute, membranaceous; blade green to straw-colored, terete, 7–28 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. |
terminal racemes of 1–8 heads or single head, 1–13 cm, branches ascending to spreading; primary bract erect; heads 40–70-flowered, spheric, 7–11 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 dark reddish brown to light brown, lance-subulate, (2.6–)3–3.5(–4) mm, apex acuminate; stamens 3, anthers 1/4 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. |
equaling perianth or slightly included, chestnut brown, 1-locular, ellipsoid to oblong, 3–3.5 mm, apex acuminate, 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, 0.4–0.5 mm, not tailed; body clear yellow-brown. |
2n | = 80. |
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Juncus brachycephalus |
Juncus bolanderi |
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Phenology | Fruiting summer–early fall. | Fruiting late spring–summer. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Swamps, marshes, stream banks, beaches, roadside meadows, and other moist or wet areas |
Elevation | 100–200 m (300–700 ft) | 0–1000 m. (0–3300 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; ID; OR; WA; BC; nw Mexico
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Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Septati |
Sibling taxa | ||
Synonyms | J. canadensis var. brachycephalus | J. bolanderi var. riparius |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Engelmann |
Web links |
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