Juncus chlorocephalus |
Juncus phaeocephalus |
|
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green head rush |
brown-head rush |
|
Habit | Herbs, perennial, cespitose, 2–4.5 dm. | Herbs, perennial, rhizomatous, 2–9 dm. |
Rhizomes | 2–3 mm diam. |
|
Culms | erect, terete, 1–3 mm diam., smooth. |
erect, 2–5 mm diam. |
Cataphylls | 1, straw-colored or maroon, apex acute. |
2, chestnut brown, apex acute. |
Leaves | basal 1–2, cauline 2–3; auricles 2–3.5 mm, apex rounded, scarious; blade terete, 2–16 cm × 1–2 mm. |
basal 2, cauline 1–2, light green; auricles absent; blade 1–15 cm × 2–5 mm. |
Inflorescences | single heads (rarely cluster of 2–3 heads), 0.5–2 cm; primary bract erect; heads 15–25-flowered, spheric, 11–14 mm diam. |
panicles of (2–)10–77 heads, 2–9.5 cm with ascending to erect branches, or heads solitary; primary bract erect; heads 3–35-flowered, spheric to obovoid, 0.5–1.2 mm diam. |
Flowers | tepals light green to light pink or white, lanceolate, 3.1–4.2 mm, apex obtuse; stamens 6, anthers 2–3 times filament length. |
tepals dark brown to purplish brown, lanceolate, 3.3–4.8 mm, nearly equal; outer tepals acuminate, mucro subulate; inner tepals acuminate or cuspidate, mucro subulate; stamens 6, anthers 2–3 times length of filaments. |
Capsules | included, straw-colored, 1-locular, broadly obovoid to ovoid, 2.2–2.5 mm, apex obtuse, valves separating at dehiscence, fertile throughout or only proximal to middle. |
included, chestnut brown or straw-colored, 1-locular, oblong, 3.8–5.6 mm (including beak), apex acute proximal to beak, beak slightly exserted. |
Seeds | oblong, 0.5 mm, not tailed; body clear yellow-brown. |
obovoid, 0.5–0.6 mm, not tailed. |
Juncus chlorocephalus |
Juncus phaeocephalus |
|
Phenology | Fruiting mid summer–fall. | Fruiting summer. |
Habitat | Sandbars, meadows, damp soil in rock outcrops, and talus | Meadows and borders of swamps |
Elevation | 1400–3000 m (4600–9800 ft) | 100–300 m (300–1000 ft) |
Distribution |
CA; NV
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CA; OR; WA; Mexico (Baja California)
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Discussion | Plants with more than 10 heads of 3–12 flowers have been separated as Juncus phaeocephalus var. paniculatus Engelmann. This variety is very similar to the neext species (Juncus macrandrus) and is probably better treated as part of that species. Until a more thorough study has been made of the entire subgenus, we are hesitant to make such a transfer. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Ensifolii |
Sibling taxa | ||
Synonyms | J. phaeocephalus var. paniculatus | |
Name authority | Engelmann | Engelmann |
Web links |