Juncus chlorocephalus |
Juncus xiphioides |
|
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green head rush |
iris-leaf rush |
|
Habit | Herbs, perennial, cespitose, 2–4.5 dm. | Herbs, perennial, rhizomatous, 5–9 dm. |
Rhizomes | 2–3 mm diam. |
|
Culms | erect, terete, 1–3 mm diam., smooth. |
erect, 2–6 mm diam. |
Cataphylls | 1, straw-colored or maroon, apex acute. |
0 or 1–2, straw-colored, apex narrowly 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 1–3, cauline 2–6, straw-colored; auricles absent; blade 10–40 cm x (3–)7–12 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 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. |
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 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. |
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. |
slightly exserted, chestnut to dark brown, 1-locular, ellipsoid, 2.4–3.8 mm, apex acuminate, not beaked. |
Seeds | oblong, 0.5 mm, not tailed; body clear yellow-brown. |
elliptic to obovate, 0.4–0.6 mm, not tailed. |
2n | = 40. |
|
Juncus chlorocephalus |
Juncus xiphioides |
|
Phenology | Fruiting mid summer–fall. | Fruiting early summer–fall. |
Habitat | Sandbars, meadows, damp soil in rock outcrops, and talus | Salt marshes, moist areas, ditches, springs, lake and stream shores |
Elevation | 1400–3000 m (4600–9800 ft) | 500–1600 m (1600–5200 ft) |
Distribution |
CA; NV
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AZ; CA; NM; NV; UT; Mexico (Baja California)
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Discussion | 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.) |
|
Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Ensifolii |
Sibling taxa | ||
Synonyms | J. xiphioides var. auratus, J. xiphioides var. littoralis | |
Name authority | Engelmann | E. Meyer: Synopsis Juncorum 50. (1822) |
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