Juncus debilis |
Juncus megacephalus |
|
---|---|---|
weak rush |
bighead rush |
|
Habit | Herbs, perennial, cespitose, 1–2.5 dm. | Herbs, perennial, rhizomatous, 3–11 dm. |
Rhizomes | 3–4 diam. |
|
Culms | erect, terete, 1–2 mm diam., smooth. |
erect, terete, 3–4 mm diam., smooth. |
Cataphylls | 0–1, maroon or dark green, apex acute. |
1–2, purple, 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 0.5–2 mm, apex acute, membranaceous; blade terete, 0–24 cm × 0.5–1.7 mm, most distal cauline leaf blade 0–2 cm, shorter than sheath. |
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. |
panicles of (1–)3–21 heads, 1–8 cm, branches erect to spreading; primary bract erect; heads 40–60-flowered, spheric, 8–12 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 straw-colored to reddish brown, lanceolate-subulate; outer tepals 2.9–4.1 mm, apex acuminate; inner tepals 2.2–3.7 mm, apex acuminate; stamens 3, anthers 1/4–1/2 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. |
exserted, , straw-colorerd, 1-locular, subulate, 2.5–4.2 mm, apex tapering to subulate beak, valves not separat ing at dehiscence, fertile throughout or only proximal to middle. |
Seeds | ellipsoid, 0.3–0.4 mm, not tailed; body clear yellow-brown. |
ellipsoid to ovoid, 0.4 mm, not tailed; body clear yellow-brown. |
Juncus debilis |
Juncus megacephalus |
|
Phenology | Fruiting summer. | Fruiting summer. |
Habitat | Marshy shores, in small streams, swamps, wet clearings, spring runs, commonly in very soft mucky substrates | Fresh marshes, moist hollows of sand dunes, swales, roadside ditches, and dry fertile soil |
Elevation | 0–700 m (0–2300 ft) | 0–100 m (0–300 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)
|
AL; FL; GA; LA; MD; MS; NC; SC; TX; VA
|
Discussion | Juncus debilis A. Gray is a name being proposed for conservation. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
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. scirpoides var. carolinianus, J. scirpoides var. echinatus |
Name authority | A. Gray: Manual 481506. (1848) | M. A. Curtis: Boston J. Nat. Hist. 1: 132. (1835) |
Web links |