Juncus debilis |
Juncus pervetus |
|
---|---|---|
weak rush |
blunt-flower rush |
|
Habit | Herbs, perennial, cespitose, 1–2.5 dm. | Herbs, perennial, rhizomatous, 7–10 dm. |
Rhizomes | 3–7 mm diam., nodes not swollen. |
|
Culms | erect, terete, 1–2 mm diam., smooth. |
erect, terete, 2–4 mm diam. |
Cataphylls | 0–1, maroon or dark green, apex acute. |
2–3, straw-colored, apex rounded. |
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, cauline 1; auricles 0.5–1.5 mm, apex blunt, cartilaginous; blade 25–35 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 panicles of 24–60 heads, 5–10 cm, branches spreading; primary bract erect; heads 15–50-flowered, spheric, 4.5–6 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 light brown, lanceolate to oblong, 2–2.5 mm, nearly equal; stamens 6, anthers longer than filament. |
Capsules | exserted, straw-colored, 1-locular, narrowly ellipsoid to lanceoloid, 2.8–3.7 7(–4.2) mm, apex acute, valves separating at dehiscence. |
included with beak slightly exserted, chestnut brown, 3-locular, ovoid, 2.5 mm, apex acute proximal to beak, valves separating at dehiscence, fertile throughout or only proximal to middle. |
Seeds | ellipsoid, 0.3–0.4 mm, not tailed; body clear yellow-brown. |
not seen. |
Juncus debilis |
Juncus pervetus |
|
Phenology | Fruiting summer. | Fruiting fall. |
Habitat | Marshy shores, in small streams, swamps, wet clearings, spring runs, commonly in very soft mucky substrates | Upper border of salt marsh |
Elevation | 0–700 m (0–2300 ft) | 0 m (0 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)
|
MA |
Discussion | Juncus debilis A. Gray is a name being proposed for conservation. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
All sheets that I have seen have aborted seeds. Juncus pervetus was thought to be Juncus subnodulosus, a European native (H. Weimarck 1946). It has been shown that this is a distinct species, however (S. Snogerup and B. Snogerup 1996). It would appear that this species is now extinct. (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 | |
Name authority | A. Gray: Manual 481506. (1848) | Fernald: Rhodora 19: 17. (1917) |
Web links |