Juncus brachycephalus |
Juncus orthophyllus |
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small-head rush |
straight-leaf rush |
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Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, perennial, 2–4 dm. |
Rhizomes | creeping. |
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Culms | erect, 1–4 mm diam., smooth. |
compressed. |
Cataphylls | 1–2, straw-colored to pink, apex acute. |
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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 several, cauline 0–3; auricles, if present, 0.5–1 mm, apex acutish; blade flat, basal 10–40 cm × 1–6 mm, cauline blade reduced. |
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, usually 3–12, each with 5–10 flowers, open; primary bract much shorter than inflorescence. |
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 brown, lanceolate, 5–6 mm, apex obtuse; outer series shorter, margins scarious, apex acute, minutely papillose; inner series with margins clear; stamens 6, filaments 0.5–1 mm, anthers 1.6–2.4(–3) mm; style 0.5–2 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, 3-locular, obovoid, 3–5 mm, shorter than perianth. |
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
ovoid, 0.6 mm, not tailed. |
2n | = 80. |
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Juncus brachycephalus |
Juncus orthophyllus |
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Phenology | Fruiting summer–early fall. | Flowering and fruiting late spring to summer. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Moist ground in mountain meadows |
Elevation | 100–200 m (300–700 ft) | 1200–3500 m (3900–11500 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; MT; NV; OR; WA; BC
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Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Graminifolii |
Sibling taxa | ||
Synonyms | J. canadensis var. brachycephalus | J. longistylis var. latifolius, J. latifolius |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Coville: Contributions from the U. S. National Herbarium 4: 207. (1893) |
Web links |
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