Juncus debilis |
Juncus gymnocarpus |
|
---|---|---|
weak rush |
Pennsylvania rush |
|
Habit | Herbs, perennial, cespitose, 1–2.5 dm. | Herbs, perennial, 5–10 dm. |
Rhizomes | widely creeping, 2–4 mm diam. |
|
Culms | erect, terete, 1–2 mm diam., smooth. |
terete, 1.5–2.5 mm diam. |
Cataphylls | 0–1, maroon or dark green, apex acute. |
several. |
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. |
blade absent. |
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. |
8–30(–50)-flowered, open, 1.5–4 cm; primary bract terete, 1–2.5 dm, much 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. |
pedicellate; bracteoles broadly ovate; tepals light brown, ovate-lanceolate, 1.8–2.5 mm, apex acuminate; inner series shorter, margins scarious, apex acute; stamens 6, filaments 1–1.3 mm, anthers 0.5–0.7 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. |
reddish tan to brown, lustrous, 3-locular, widely ellipsoid, 2–3 × 1.8–2.2 mm, exceeding perianth. |
Seeds | ellipsoid, 0.3–0.4 mm, not tailed; body clear yellow-brown. |
dark amber, obovoid, 0.7–1 mm, not tailed. |
Juncus debilis |
Juncus gymnocarpus |
|
Phenology | Fruiting summer. | Flowering and fruiting summer. |
Habitat | Marshy shores, in small streams, swamps, wet clearings, spring runs, commonly in very soft mucky substrates | Sphagnous swamps, low woods, edges of lakes |
Elevation | 0–700 m (0–2300 ft) | 600–1500 m (2000–4900 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; MS; NC; PA; SC; TN
|
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. Genuini |
Sibling taxa | ||
Synonyms | J. acuminatus var. debilis, J. radicans | J. smithii |
Name authority | A. Gray: Manual 481506. (1848) | Coville: Memoirs of the Torrey Botanical Club 5: 106. (1894) |
Web links |