Juncus debilis |
Juncus repens |
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weak rush |
creeping rush, lesser creeping rush |
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Habit | Herbs, perennial, cespitose, 1–2.5 dm. | Herbs, perennial, cespitose, floriferous culm 0.5–3 dm. |
Culms | erect, terete, 1–2 mm diam., smooth. |
first ascending, soon arcuate-stoloniferous and creeping or floating, or growing submersed along bottom, each node with cluster of basal leaves and fibrous roots, eventually each emergent terrestrial node with floriferous culm. |
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; auricles 0.5–1 mm, apex acutish, membranous or thicker; blade spreading, flat, 2–10(–15) cm × 1–3 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–)2–10, each with 3–12 flowers, open; primary bract usually 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 green, margins scarious; inner series narrowly lanceolate, 5–9 mm, apex usually recurved; outer series obviously shorter, apex usually erect; stamens 3, filaments 1.5–3 mm, anthers 0.5–0.8 mm; style 0.5 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, 3-locular, narrowly ellipsoid, 3.5–5.5 × 0.8–1.2 mm. |
Seeds | ellipsoid, 0.3–0.4 mm, not tailed; body clear yellow-brown. |
brown, ovoid, 0.3–0.4 mm, not tailed. |
Juncus debilis |
Juncus repens |
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Phenology | Fruiting summer. | Flowering and fruiting summer–fall. |
Habitat | Marshy shores, in small streams, swamps, wet clearings, spring runs, commonly in very soft mucky substrates | Shores of ponds, lakes, and borrow pits, flatwood depressions, ditches, and drainage canals |
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; AR; DE; FL; GA; LA; MD; MS; NC; OK; SC; TN; TX; VA; Mexico (Tabasco); West Indies (Cuba)
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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 | |
Name authority | A. Gray: Manual 481506. (1848) | Michaux: Flora Boreali-Americana 1: 191. (1803) |
Web links |