Juncus debilis |
Juncus dichotomus |
|
---|---|---|
weak rush |
dichotomous rush, fork rush |
|
Habit | Herbs, perennial, cespitose, 1–2.5 dm. | Herbs, perennial, to 10 dm. |
Rhizomes | densely branched to short- creeping. |
|
Culms | erect, terete, 1–2 mm diam., smooth. |
|
Cataphylls | 0–1, maroon or dark green, apex acute. |
1–3. |
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, (1-)2-3; auricles 0.2-0.5(-0.6) mm, scarious to leathery; blade nearly terete, channeled or flat, 10-25(-40) cm × (0.5-)0.7-1(-1.2) mm, 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, (5–)10–85(–100)-flowered, congested to somewhat loose, (1-)2.5-10(-13) cm; primary bract usually exceeding inflorescence. |
Flowers | tepals green to straw-colored, lanceolate, 1.8–2.3(–2.5) mm, apex sharply acuminate; stamens 3, 1/2 filament length. |
bracteoles 2; tepals green, lanceolate, (3-)3.3-4.5(-5.5) mm; outer and inner series nearly equal; stamens 6, filaments 0.6–1.2 mm, anthers 0.4-0.8(-1) 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. |
tan to brown, 1-locular to pseudo-3-locular, ellipsoid to widely so, (2.5-)2.8-3.5(-4.5) × 1x 1.6-2.2 mm. |
Seeds | ellipsoid, 0.3–0.4 mm, not tailed; body clear yellow-brown. |
brownish to amber, ellipsoid to lunate, 0.3-0.4 mm, not tailed. |
2n | = ca. 80. |
|
Juncus debilis |
Juncus dichotomus |
|
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 | Ditches, shores, clearings, and other typically open areas, usually in sandy, well-drained (but frequently wet) soil |
Elevation | 0–700 m (0–2300 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; AR; CO; CT; DC; DE; FL; GA; KY; LA; MA; MD; MS; NC; NJ; NY; OH; PA; RI; SC; TN; VA; WV; Mexico; Central America; South America; Texas
|
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 | J. dichotomus var. platyphyllus, J. tenuis var. dichotomus, J. tenuis var. platyphyllus, J. platyphyllus |
Name authority | A. Gray: Manual 481506. (1848) | Elliott |
Web links |