Juncus brachycephalus |
Juncus oxymeris |
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small-head rush |
point rush |
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Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, perennial, rhizomatous, 3–6 dm. |
Rhizomes | 1–2 mm diam. |
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Culms | erect, 1–4 mm diam., smooth. |
erect, 2–4 mm diam. |
Cataphylls | 1–2, straw-colored to pink, apex acute. |
0–1, straw-colored, apex narrowly 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 1–3, cauline 3–4, straw-colored; auricles absent; blade 3–20 cm × 3–7 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. |
panicles of 10–50 heads, 6–20 cm, erect to ascending branches; primary bract erect; heads 3–11-flowered, turbinate to hemispheric, 4–8 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 straw-colored, lanceolate, 2.5–3.2 mm, nearly equal, apex acute to narrowly acuminate, mucronate; stamens 6, anthers 0.5–1.5 times length of filaments. |
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, chestnut brown, 1-locular, broadly lanceoloid to narrowly oblong, 3.3–4.7 mm, apex tapering to beak, separating at dehiscence. |
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
obovoid, 0.5 mm, not tailed. |
2n | = 80. |
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Juncus brachycephalus |
Juncus oxymeris |
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Phenology | Fruiting summer–early fall. | Fruiting late spring–fall. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Stream and lake shores, montane meadows and seasonally emergent wetlands |
Elevation | 100–200 m (300–700 ft) | 100–2000 m (300–6600 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; WA; BC
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Discussion | Juncus oxymeris should be expected in Mexico (Baja California). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Ensifolii |
Sibling taxa | ||
Synonyms | J. canadensis var. brachycephalus | J. acutiflorus |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Engelmann |
Web links |
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