Juncus triglumis |
Juncus phaeocephalus |
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three-flower rush, three-hulled rush |
brown-head rush |
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Habit | Herbs, perennial, cespitose, 0.3–3.5 dm. | Herbs, perennial, rhizomatous, 2–9 dm. | ||||
Rhizomes | 2–3 mm diam. |
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Culms | 1–8, 0.3–0.5 mm diam. |
erect, 2–5 mm diam. |
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Cataphylls | 1–2. |
2, chestnut brown, apex acute. |
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Leaves | basal, 2–4; auricles slightly prolonged, rounded, scarious to ± leathery; blade deeply channeled, 2–10 cm, mostly shorter than culms. |
basal 2, cauline 1–2, light green; auricles absent; blade 1–15 cm × 2–5 mm. |
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Inflorescences | solitary heads, each with 2–3(–50) flowers; primary bracts brownish, nearly equal to or slightly shorter thanabout equaling inflorescence. |
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. |
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Flowers | tepals pale brown or darker, oblong-lanceolate, 3–5 mm, outer and inner series nearly equal; stamens 6, filaments 2.5–4 mm, anthers 0.6–1 mm; styles 0.5–0.8 mm. |
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. |
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Capsules | tan, pseudo-3-locular, 3-gonous–cylindric, apex obtuse, mucronate. |
included, chestnut brown or straw-colored, 1-locular, oblong, 3.8–5.6 mm (including beak), apex acute proximal to beak, beak slightly exserted. |
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Seeds | tan or darker, fusiform, body 0.5–1 mm, tails 0.6–1 mm. |
obovoid, 0.5–0.6 mm, not tailed. |
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Juncus triglumis |
Juncus phaeocephalus |
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Phenology | Fruiting summer. | |||||
Habitat | Meadows and borders of swamps | |||||
Elevation | 100–300 m (300–1000 ft) | |||||
Distribution |
AK; CO; ID; MT; NM; OR; UT; WY; AB; BC; MB; NT; NU; ON; QC; SK; YT; Eurasia
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CA; OR; WA; Mexico (Baja California)
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Discussion | Varieties 3 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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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Key |
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Source | FNA vol. 22. | FNA vol. 22. | ||||
Parent taxa | Juncaceae > Juncus > subg. Alpini | Juncaceae > Juncus > subg. Ensifolii | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | J. phaeocephalus var. paniculatus | |||||
Name authority | Linnaeus: Sp. Pl. 1: 328. (1753) | Engelmann | ||||
Web links |