Juncus acutiflorus |
Juncus brachycarpus |
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sharpflower rush |
short-fruit rush, white-root rush |
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Habit | Herbs, perennial, rhizomatous, to 8 dm. | Herbs, perennial, not cespitose, rhizomatous, (3–)4.5–8(–9) dm. |
Rhizomes | 5–6 mm diam., nodes not swollen. |
tuberous, 3–4 mm diam. |
Culms | erect, terete, 3 mm diam., smooth. |
erect, terete, 2–3 mm diam., smooth. |
Cataphylls | 1, straw-colored, apex acute. |
0(–1), straw-colored, apex acute. |
Leaves | basal 1, cauline 2; auricles 0.5 mm, apex rounded, cartilaginous; blade 7–45 cm x 1–2 mm, terete, not scabrous. |
basal 1–2, cauline 2–4, auricles 0.5–3.5 mm, apex rounded, scarious; blade green to straw-colored, terete, 3–50 cm × 1–2 mm diam. |
Inflorescences | terminal panicles of 70–120 heads, 6–10 cm, branches ascending; primary bract erect; heads 3–5(–8)-flowered, obconic, 2–4 mm diam. |
terminal panicles of 2–10(–20) heads or a single head, 1–4(–10) cm, branches ascending; primary bract erect; heads 30–100-flowered, spheric, 8–10 mm diam. |
Flowers | tepals dark reddish brown, lanceolate, apex acuminate to subulate tipte; outer tepals 1.9–2.2 mm; inner tepals 2–2.3 mm; stamens 6, anthers 2 times filament length. |
tepals green to straw-colored, often red-tinted, lanceolate-subulate, apex acuminate; outer tepals 2.5–3.8 mm; inner tepals 2–3.2 mm; stamens 3, anthers 1/4–1/2 filament length. |
Capsules | inserted with beak exserted, straw-colored, 1-locular, narrowly ovoid, 2.3–2.4 mm, tapering to subulate tip, valves separating at dehiscence. |
included, chestnut brown, 1-locular, obconic or ovoid, 1.8–2.7 mm, apex obtuse, valves separating at dehiscence, fertile throughout or only proximal to middle. |
Seeds | narrowly ovoid, 0.5–0.6 mm, not tailed; body clear yellow-brown. |
ellipsoid to oblique-oblong, 0.3–0.4 mm, not tailed; cody clear to yellow-brown. |
2n | = 44. |
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Juncus acutiflorus |
Juncus brachycarpus |
|
Phenology | Fruiting fall. | Fruiting mid summer–fall. |
Habitat | Wet woods | Damp clayey, peaty, or sandy soils, swamps, ditches, ponds, wet woods, wet prairies |
Elevation | 0–10 m (0–0 ft) | 0–500 m (0–1600 ft) |
Distribution |
NF; SPM; Europe; Asia; Africa |
AL; AR; CT; DE; FL; GA; IL; IN; KS; KY; LA; MA; MD; MI; MN; MO; MS; NC; NJ; NY; OH; OK; PA; SC; TN; TX; VA; WV; ON
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Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | ||
Sibling taxa | ||
Name authority | Ehrhart: in G. F. Hoffmann, Deutschl. Fl. 1: 125. (1791) | Engelmann: in A. Gray, Manual of Botany of the Northern United States (ed. 5) 542. (1867) |
Web links |
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