Juncus debilis |
Juncus bolanderi |
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weak rush |
Bolander's rush |
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Habit | Herbs, perennial, cespitose, 1–2.5 dm. | Herbs, perennial, not cespitose, rhizomatous, 2.5–8.5 dm. |
Rhizomes | 2–3 mm, tuberous. |
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Culms | erect, terete, 1–2 mm diam., smooth. |
erect, terete, 1–3 mm diam., smooth. |
Cataphylls | 0–1, maroon or dark green, apex acute. |
1–2, straw-colored, apex acute. |
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 0–1, cauline 2–3, auricles 2–3 mm, apex acute, membranaceous; blade green to straw-colored, terete, 7–28 cm × 1–2 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. |
terminal racemes of 1–8 heads or single head, 1–13 cm, branches ascending to spreading; primary bract erect; heads 40–70-flowered, spheric, 7–11 mm diam. |
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 reddish brown to light brown, lance-subulate, (2.6–)3–3.5(–4) mm, apex acuminate; stamens 3, anthers 1/4 filament length. |
Capsules | exserted, straw-colored, 1-locular, narrowly ellipsoid to lanceoloid, 2.8–3.7 7(–4.2) mm, apex acute, valves separating at dehiscence. |
equaling perianth or slightly included, chestnut brown, 1-locular, ellipsoid to oblong, 3–3.5 mm, apex acuminate, valves separating at dehiscence, fertile throughout or only proximal to middle. |
Seeds | ellipsoid, 0.3–0.4 mm, not tailed; body clear yellow-brown. |
oblong, 0.4–0.5 mm, not tailed; body clear yellow-brown. |
Juncus debilis |
Juncus bolanderi |
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Phenology | Fruiting summer. | Fruiting late spring–summer. |
Habitat | Marshy shores, in small streams, swamps, wet clearings, spring runs, commonly in very soft mucky substrates | Swamps, marshes, stream banks, beaches, roadside meadows, and other moist or wet areas |
Elevation | 0–700 m (0–2300 ft) | 0–1000 m. (0–3300 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; OR; WA; BC; nw Mexico
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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. Septati |
Sibling taxa | ||
Synonyms | J. acuminatus var. debilis, J. radicans | J. bolanderi var. riparius |
Name authority | A. Gray: Manual 481506. (1848) | Engelmann |
Web links |
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