Juncus debilis |
Juncus regelii |
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weak rush |
Regel rush, Regel's rush |
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Habit | Herbs, perennial, cespitose, 1–2.5 dm. | Herbs, perennial, 2–6 dm. |
Rhizomes | long creeping. |
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Culms | erect, terete, 1–2 mm diam., smooth. |
erect, slightly compressed, never rooting at nodes. |
Cataphylls | 0–1, maroon or dark green, apex acute. |
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Leaves | basal 0–1, cauline 1–3; auricles 1–1.5 mm, apex rounded, scarious; blade maroon or dark green, terete, 1–12.5 cm × 0.5–1.5 mm. |
basal several, cauline 1–3; auricles absent, or essentially so; blade flat, 0.5–3 dm × 1.5–4 mm. |
Inflorescences | terminal panicles of 3–50 heads, 2–8 cm, branches ascending to spreading; primary bract erect; heads 2–10-flowered, obpyramidal, 2–5 mm diam. |
glomerules 1–5, each with (8–)10–30 flowers, congested to open, 2–6 cm; primary bract shorter than inflorescence. |
Flowers | tepals green to straw-colored, lanceolate, 1.8–2.3(–2.5) mm, apex sharply acuminate; stamens 3, 1/2 filament length. |
tepals dark brown with green midstripe, lanceolate, 4–6 mm, margins scarious, occasionally papillose; inner series slightly shorter; stamens 6, filaments 1–1.3 mm, anthers 1–1.5 mm; style 0.6 mm. |
Capsules | exserted, straw-colored, 1-locular, narrowly ellipsoid to lanceoloid, 2.8–3.7 7(–4.2) mm, apex acute, valves separating at dehiscence. |
tan or darker, 3-locular, obovoid, 3–5 mm, shorter than perianth. |
Seeds | ellipsoid, 0.3–0.4 mm, not tailed; body clear yellow-brown. |
ovoid, body 0.6–0.8 mm, tails 0.2–0.4 mm. |
Juncus debilis |
Juncus regelii |
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Phenology | Fruiting summer. | Flowering and fruiting summer. |
Habitat | Marshy shores, in small streams, swamps, wet clearings, spring runs, commonly in very soft mucky substrates | Moist to wet meadows in montane or subalpine areas |
Elevation | 0–700 m (0–2300 ft) | 540–3000 m (1800–9800 ft) |
Distribution |
AL; AR; DE; FL; GA; IL; KY; LA; MD; MO; MS; NC; NJ; NY; PA; SC; TN; TX; VA; Mexicos (Chiapas); Central America (Honduras)
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CA; ID; MT; NV; OR; UT; WA; WY; AB; BC
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Discussion | Juncus debilis A. Gray is a name being proposed for conservation. (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. Graminifolii |
Sibling taxa | ||
Synonyms | J. acuminatus var. debilis, J. radicans | J. jonesii |
Name authority | A. Gray: Manual 481506. (1848) | Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 414. (1890) |
Web links |
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