Juncus triglumis |
Juncus xiphioides |
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three-flower rush, three-hulled rush |
iris-leaf rush |
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Habit | Herbs, perennial, cespitose, 0.3–3.5 dm. | Herbs, perennial, rhizomatous, 5–9 dm. | ||||
Rhizomes | 2–3 mm diam. |
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Culms | 1–8, 0.3–0.5 mm diam. |
erect, 2–6 mm diam. |
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Cataphylls | 1–2. |
0 or 1–2, straw-colored, apex narrowly 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 1–3, cauline 2–6, straw-colored; auricles absent; blade 10–40 cm x (3–)7–12 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 or racemes of 20–50 heads, 2–14 cm, erect or ascending branches; primary bract erect; heads 15–70-flowered, obovoid to globose, 7–11 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 green to brown or reddish brown, lanceolate, 2.4–3.7 mm, nearly equal, apex acuminate; stamens 6; anthers ½1/2 to equal filament length. |
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Capsules | tan, pseudo-3-locular, 3-gonous–cylindric, apex obtuse, mucronate. |
slightly exserted, chestnut to dark brown, 1-locular, ellipsoid, 2.4–3.8 mm, apex acuminate, not beaked. |
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Seeds | tan or darker, fusiform, body 0.5–1 mm, tails 0.6–1 mm. |
elliptic to obovate, 0.4–0.6 mm, not tailed. |
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2n | = 40. |
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Juncus triglumis |
Juncus xiphioides |
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Phenology | Fruiting early summer–fall. | |||||
Habitat | Salt marshes, moist areas, ditches, springs, lake and stream shores | |||||
Elevation | 500–1600 m (1600–5200 ft) | |||||
Distribution |
AK; CO; ID; MT; NM; OR; UT; WY; AB; BC; MB; NT; NU; ON; QC; SK; YT; Eurasia
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AZ; CA; NM; NV; UT; Mexico (Baja California)
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Discussion | Varieties 3 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
This species and the next (Juncus ensifolius) are closely related and have been treated as members of a single species (J. xiphioides) by Engelmann. Until a study of the complete subgenus is done, we are hesitant to use a varietal name (J. xiphioides var. triandrus) for the widespread western taxon J. ensifolius. (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. xiphioides var. auratus, J. xiphioides var. littoralis | |||||
Name authority | Linnaeus: Sp. Pl. 1: 328. (1753) | E. Meyer: Synopsis Juncorum 50. (1822) | ||||
Web links |