Juncus debilis |
Juncus roemerianus |
|
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weak rush |
black needlerush, needle rush, needlegrass rush |
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Habit | Herbs, perennial, cespitose, 1–2.5 dm. | Herbs, perennial, 5–15 dm. |
Rhizomes | long, thick, scaly. |
|
Culms | erect, terete, 1–2 mm diam., smooth. |
gray-green, 2–5 mm diam. |
Cataphylls | 0–1, maroon or dark green, apex acute. |
2–5. |
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, 1–3; auricles absent; blade terete, 40–80 cdm × 1.5–2.5 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. |
sympodial or appearing lateral, glomerules to 150, each with 2–6 perfect or pistillate flowers, congested to open, 4–20 × 5–10 cm; primary bracts terete, longer 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 pale brown, 2.5–3.3 mm, apex acuminate; outer series acuminate; inner series slightly shorter, acutish; stamens 6, sometimes rudimentary, filaments 0.2–0.7 mm, anthers 1.3–2.5 mm; style 0.3–1 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. |
brown, 3-locular, ovoid to oblate, 1.7–3 × 1.3–1.6 mm, mostly distinctly shorter than perianth, apiculate. |
Seeds | ellipsoid, 0.3–0.4 mm, not tailed; body clear yellow-brown. |
dark brown, ellipsoid, 0.4–0.6 mm, not tailed. |
Juncus debilis |
Juncus roemerianus |
|
Phenology | Fruiting summer. | Flowering and fruiting spring–early fall. |
Habitat | Marshy shores, in small streams, swamps, wet clearings, spring runs, commonly in very soft mucky substrates | Coastal tidal marshes in dense zonal stands |
Elevation | 0–700 m (0–2300 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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AL; DC; DE; FL; GA; LA; MD; MS; NC; SC; VA; Texas
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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. Juncus |
Sibling taxa | ||
Synonyms | J. acuminatus var. debilis, J. radicans | |
Name authority | A. Gray: Manual 481506. (1848) | Scheele: Linnaea 22:348. (1849) |
Web links |