Juncus filiformis |
Juncus xiphioides |
|
---|---|---|
thread rush |
iris-leaf rush |
|
Habit | Herbs, perennial, 0.2–3.5 dm. | Herbs, perennial, rhizomatous, 5–9 dm. |
Rhizomes | widely creeping, sparingly branched, 1.5–2 mm diam., nodes closely set. |
2–3 mm diam. |
Culms | terete, 1 mm diam. |
erect, 2–6 mm diam. |
Cataphylls | several. |
0 or 1–2, straw-colored, apex narrowly acute. |
Leaves | blade absent. |
basal 1–3, cauline 2–6, straw-colored; auricles absent; blade 10–40 cm x (3–)7–12 mm. |
Inflorescences | 3–10(–12)-flowered, loosely congested, 1–2 cm; primary bract terete, nearly equaling to much longer than culm. |
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 | pedicellate; bracteoles broadly ovate, tepals light brown or green, lanceolate, 2.5–4.2 mm; inner series loosely subtending capsule at maturity, slightly shorter, margins scarious; stamens 6, filaments 0.5–0.9 mm, anthers 0.5–0.7 mm; style 0.2 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. |
Capsules | tan, 3-locular, nearly globose, 2.5–3 × 1.8–2.1 mm, shorter than perianth. |
slightly exserted, chestnut to dark brown, 1-locular, ellipsoid, 2.4–3.8 mm, apex acuminate, not beaked. |
Seeds | amber, 0.5–0.6 mm, not tailed. |
elliptic to obovate, 0.4–0.6 mm, not tailed. |
2n | = 40, 70, 80, 84. |
= 40. |
Juncus filiformis |
Juncus xiphioides |
|
Phenology | Flowering and fruiting summer. | Fruiting early summer–fall. |
Habitat | Usually sandy, moist or wet soil along stream banks, pools, lakes or in meadow depressions, rarely in bogs, frequently hidden by larger vegetation | Salt marshes, moist areas, ditches, springs, lake and stream shores |
Elevation | 0–3000 m (0–9800 ft) | 500–1600 m (1600–5200 ft) |
Distribution |
AK; CO; ID; MA; ME; MI; MN; MT; NE; NH; NJ; NY; OR; PA; UT; VT; WA; WI; WV; WY; AB; BC; MB; NB; NL; NS; NT; NU; ON; PE; QC; SK; YT; SPM; Greenland; Eurasia; Atlantic Islands (Iceland)
|
AZ; CA; NM; NV; UT; Mexico (Baja California)
|
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. Genuini | Juncaceae > Juncus > subg. Ensifolii |
Sibling taxa | ||
Synonyms | J. xiphioides var. auratus, J. xiphioides var. littoralis | |
Name authority | Linnaeus: Sp. Pl. 1: 326. (1753) | E. Meyer: Synopsis Juncorum 50. (1822) |
Web links |