Juncus debilis |
Juncus squarrosus |
|
---|---|---|
weak rush |
heath rush, mosquito rush, mosquito rush (vascan) |
|
Habit | Herbs, perennial, cespitose, 1–2.5 dm. | Herbs, perennial, cespitose to mat-forming, 2–5 dm. |
Rhizomes | short, nearly erect, branching. |
|
Culms | erect, terete, 1–2 mm diam., smooth. |
1(–2). |
Cataphylls | 0–1, maroon or dark green, apex acute. |
2–4. |
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, 3–6; auricles 0.2–0.4 mm, membranous to scarious; blade arcuate, spreading, grayish green, channeled, 7–30 cm × 1–2 mm, nearly leathery, margins entire. |
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, 7–40-flowered, somewhat loose, 3–10 × 1–2 cm; 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. |
pedicels 0.5–2 mm; bracteoles 2; tepals brown to blackish, 4–5.5 mm; outer and inner series nearly equal, apex obtuse to nearly acute; stamens 6, filaments 0.5 mm, anthers 1.5–2 mm; style 0.2 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. |
brownish, 3-locular, ovoid to ellipsoid, 4–5 × 2.3–3 mm, nearly equal to perianth. |
Seeds | ellipsoid, 0.3–0.4 mm, not tailed; body clear yellow-brown. |
brownish, ellipsoid, 0.6–0.9 mm, not tailed. |
2n | = 42. |
|
Juncus debilis |
Juncus squarrosus |
|
Phenology | Fruiting summer. | Flowering and fruiting late spring–summer. |
Habitat | Marshy shores, in small streams, swamps, wet clearings, spring runs, commonly in very soft mucky substrates | Moist, open sites and bogs, occasionally disturbed areas |
Elevation | 0–700 m (0–2300 ft) | 20–200 m (100–700 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)
|
WI; Greenland; native; Europe [Introduced in North America] |
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. Poiophylli |
Sibling taxa | ||
Synonyms | J. acuminatus var. debilis, J. radicans | |
Name authority | A. Gray: Manual 481506. (1848) | Linnaeus: Sp. Pl. 1: 327. (1753) |
Web links |