Juncus dubius |
Juncus trigonocarpus |
|
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dubius rush, mariposa rush, questionable rush |
redpod rush |
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Habit | Herbs, perennial, rhizomatous, 3–7.5 dm. | Herbs, perennial, cespitose, 5–10 dm. |
Rhizomes | 2–3 mm diam., not swollen. |
|
Culms | erect, terete, 2–4 mm diam., smooth or rugulose. |
erect, 2–5 mm diam., smooth. |
Cataphylls | 1–2, pink to straw-colored, apex acute. |
1–2, straw-colored, apex rounded. |
Leaves | basal 1–2, cauline 1–2; auricles 1–4.9 mm, , apex rounded, membranaceous; blade green to straw-colored, terete, 20–30 cm × 1.5–4 mm, rugulose or smooth. |
basal 0–1, cauline 2–3; auricles 0.2–0.4 mm, apex obtuse, leathery; blade terete, 2.5–22 cm × 1.3–4 mm, smooth. |
Inflorescences | terminal panicles of 25–66 heads, 7–13 cm, branches spreading; primary bract erect; heads 6–10-flowered, hemispheric to obovoid, 5–10 mm diam. |
panicles of 30–100 heads, 3–9 cm, stiffly erect or ascending branches; primary bract erect; heads 2–8-flowered, obconic, 4–8 mm diam. |
Flowers | tepals straw-colored to brown, lanceolate, apex acuminate; outer tepals (2–)2.5–3.4 mm; inner tepals (2–)2.6–3.6 mm; stamens 6, anthers 1.5–2 times filament length. |
tepals green to reddish brown, lanceolate; outer tepals 2.5–2.8 mm, acuminate; inner tepals 2.8–3.5 mm, acute; stamens 3–6, anthers 1/2 filament length. |
Capsules | exserted, chestnut brown, 1-locular, subuloidsubulate, (2.4–)3–3.9 mm, apex tapering to subulate tip, valves separating at dehiscence. |
exserted, chestnut brown, 3-locular, ovoid-pyramidal, 4–5 mm, apex acuminate, valves separating at dehiscence.. |
Seeds | obovoid, 0.3–0.4 mm, not tailed. |
fusiform, 1.8–2.6 mm, tailed; body covered with whitish. |
Translucent | veil. |
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2n | = 40. |
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Juncus dubius |
Juncus trigonocarpus |
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Phenology | Fruiting early summer–late fall. | Fruiting early fall–early winter (fruit often persisting until spring). |
Habitat | Montane meadows, riverbeds, canyons, aroyos | Wet pinewoods, pine barrens, bogs, hammocks, roadsides, and seepy areas |
Elevation | 100–1600 m (300–5200 ft) | 0–200 m (0–700 ft) |
Distribution |
CA
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AL; FL; GA; LA; MS; NC; SC; TX
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Discussion | Juncus dubius has rugulose stems and leaves throughout most of its range, but on the periphery (in Mariposa, San Diego, and Sonoma counties, California) the plants are smooth. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | J. rugulosus | J. caudatus |
Name authority | Engelmann | Steudel: Syn. Pl. Glumac. 2: 308. (1855) |
Web links |