Juncus brachycephalus |
Juncus confusus |
|
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small-head rush |
Colorado rush |
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Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, perennial, cespitose, 3–5 dm. |
Rhizomes | densely branched. |
|
Culms | erect, 1–4 mm diam., smooth. |
(1–)5–15(–25). |
Cataphylls | 1–2, straw-colored to pink, apex acute. |
1–3. |
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, 2–4; auricles 0.3–0.7 mm, apex usually rounded, scarious to membranaceous; blade flat, 3–15 cm × 0.4–1 mm, margins entire. |
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. |
3–25-flowered, congested, 1–2.5 × 1–2 cm; primary bract usually exceeding 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. |
not secund;: bracteoles 2; tepals dark green to blackish, usually with brownish midstripe, lanceolate to lanceolate-ovate, 3.5–4.3 mm, margins clear; outer and inner series nearly equal; stamens 6, filaments 0.6–0.9 mm, anthers 0.3–0.5 mm; style 0.1 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 darker, 3-locular, nearly globose to widely obvoid, 2.5–3.5 × 1.3–1.8 mm, shorter than perianth. |
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
yellowish, obovoid to ellipsioid, 0.4–0.5 mm, not tailed. |
2n | = 80. |
= 80. |
Juncus brachycephalus |
Juncus confusus |
|
Phenology | Fruiting summer–early fall. | Flowering and fruiting late spring–summer. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Moist, open grasslands and meadows |
Elevation | 100–200 m (300–700 ft) | 700–3400 m (2300–11200 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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AZ; CA; CO; ID; MT; NM; NV; OR; SD; UT; WA; WY; AB; BC; SK
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Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Poiophylli |
Sibling taxa | ||
Synonyms | J. canadensis var. brachycephalus | J. exilis |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Coville: Proceedings of the Biological Society of Washington 10: 127. (1896) |
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