Juncus xiphioides |
Juncus georgianus |
|
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iris-leaf rush |
Georgia rush |
|
Habit | Herbs, perennial, rhizomatous, 5–9 dm. | Herbs, short-lived perennial, cespitose, to 4 dm. |
Rhizomes | 2–3 mm diam. |
|
Culms | erect, 2–6 mm diam. |
3–40. |
Cataphylls | 0 or 1–2, straw-colored, apex narrowly acute. |
|
Leaves | basal 1–3, cauline 2–6, straw-colored; auricles absent; blade 10–40 cm x (3–)7–12 mm. |
basal, 2–3; auricles 0.2–0.3 mm, scarious to membranous; blade flat, 5–15 cm × 0.4–0.7 mm, margins entire. |
Inflorescences | 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. |
(3–)8–30(–45)-flowered, diffuse, 3–11 cm; primary bract rarely surpassing inflorescence. |
Flowers | 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. |
bracteoles 2; tepals greenish to tan, lanceolate, (3.3–)3.6–5.1(–5.7) mm; outer and inner series nearly equal, apex acuminate; stamens 6, filaments 0.2–0.4 mm, anthers (0.8–)1.2–1.5(–1.7) mm; style 0.6–0.8 mm. |
Capsules | slightly exserted, chestnut to dark brown, 1-locular, ellipsoid, 2.4–3.8 mm, apex acuminate, not beaked. |
tan, 3-locular, ellipsoid to narrowly so, 2.7–4 × 1.2–1.7 mm. |
Seeds | elliptic to obovate, 0.4–0.6 mm, not tailed. |
tan, ellipsoid or widely so, 0.364–0.45 mm, not tailed. |
2n | = 40. |
= ca. 80. |
Juncus xiphioides |
Juncus georgianus |
|
Phenology | Fruiting early summer–fall. | Flowering and fruiting spring. |
Habitat | Salt marshes, moist areas, ditches, springs, lake and stream shores | Exposed sites with thin, usually sandy soil over surfacing granite (flatrocks), the soil in these areas may be moist in the spring from seepage or for a short period after rainfalls |
Elevation | 500–1600 m (1600–5200 ft) | 300–600 m (1000–2000 ft) |
Distribution |
AZ; CA; NM; NV; UT; Mexico (Baja California)
|
AL; GA; NC; SC |
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. Ensifolii | Juncaceae > Juncus > subg. Poiophylli |
Sibling taxa | ||
Synonyms | J. xiphioides var. auratus, J. xiphioides var. littoralis | |
Name authority | E. Meyer: Synopsis Juncorum 50. (1822) | Coville: Bulletin of the Torrey Botanical Club 22:44. (1895) |
Web links |