Juncus debilis |
Juncus polycephalus |
|
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weak rush |
flatleaf rush, manyhead rush |
|
Habit | Herbs, perennial, cespitose, 1–2.5 dm. | Herbs, perennial, cespitose, 6–10 dm. |
Culms | erect, terete, 1–2 mm diam., smooth. |
erect, 3–14 mm diam. |
Cataphylls | 0–1, maroon or dark green, apex acute. |
absent. |
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 2–3(–6), cauline 1–4, brownish green; auricles absent; blade 8–70 cm × 4–8 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. |
panicles of 16–82 heads, 10–30 cm; primary bract erect; heads 20–30-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 green to reddish, lance-subulate, 3–4 mm, nearly equal, apex acuminate; stamens 3, anthers 1/3–1/2 length of filaments. |
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-colored, 1-locular, narrowly ovoid, 4–5 mm, apex tapering to beak, remaining after dehiscence. |
Seeds | ellipsoid, 0.3–0.4 mm, not tailed; body clear yellow-brown. |
lance-ellipsoid, 0.5–0.6 mm, not tailed. |
Juncus debilis |
Juncus polycephalus |
|
Phenology | Fruiting summer. | Fruiting spring–fall. |
Habitat | Marshy shores, in small streams, swamps, wet clearings, spring runs, commonly in very soft mucky substrates | Wet or seasonally wet shores, depressions, occasionally in fairly deep water of streams, usually with a peaty or mucky substrate, occasionally sandy to gravelly |
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)
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AL; FL; GA; LA; MD; MS; NC; SC; TX
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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.) |
|
Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Ensifolii |
Sibling taxa | ||
Synonyms | J. acuminatus var. debilis, J. radicans | J. echinatus, J. engelmannii |
Name authority | A. Gray: Manual 481506. (1848) | Michaux: Flora Boreali-Americana 1: 192. 1803 (as polycephalos) |
Web links |