Juncus brachycephalus |
Juncus triformis |
|
---|---|---|
small-head rush |
long-style dwarf rush, Yosemite dwarf rush |
|
Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, annual, cespitose, 0.5–1.5 dm. |
Culms | erect, 1–4 mm diam., smooth. |
2–80, capillary, 0.1–4 mm diam. |
Cataphylls | 1–2, straw-colored to pink, apex acute. |
|
Leaves | basal 1–3, cauline 1–2; auricles 0.6–1.5 mm, apex rounded, scarious; blade terete to compressed, 0.2–12 cm × 0.5–2 mm. |
1/5–1/3 height of plant. |
Inflorescences | panicles of 5–80 heads, 5–25 cm, branches ascending; primary bract erect; heads 2–6-flowered, ellipsoid to obovoid, 2–5 mm diam. |
headlike clusters, each with 1–7 flowers, bracts subtending inflorescence 2–10, ovate to broadly lanceolate, inconspicuous, 0.7–2.4 mm, membranous, apex acute. |
Flowers | tepals green to light brown, lanceolate; outer tepals 1.8–2.5 mm, apex obtuse to nearly acute; inner tepals 2–2.8 mm, apex obtuse to nearly acute; stamens 3 or 6, anthers 1/2 filament length. |
tepals reddish with green central band, linear to lanceolate, 1.9–4.5 × 0.5–1.1 mm; inner series slightly longer than outer, apex acuminate to attenuate; stamens 3, filaments 0.4–1.1 mm, anthers 1–2.2 mm; style persistent, 1–3.2 mm, stigma 0.5–2.5 mm. |
Capsules | exserted, chestnut to dark brown, imperfectly 3-locular, obconic, 2.4–3.8 mm, apex acute proximal to beak, valves separating at dehiscence. |
reddish, 3-locular, ovoid to ellipsoid or oblate, 1.6–2.5 × 1.1–1.8 mm, usually 1/2 length of tepals. |
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
nearly globose to ellipsoid, 0.3–0.7 mm. |
n | = 18. |
|
2n | = 80. |
|
Juncus brachycephalus |
Juncus triformis |
|
Phenology | Fruiting summer–early fall. | Flowering and fruiting spring–mid summer. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Shallow soil of seepage areas on granite outcrops, such as along stream banks, ditches, around springs |
Elevation | 100–200 m (300–700 ft) | 0–2500 m (0–8200 ft) |
Distribution |
AL; CO; CT; GA; IL; IN; MA; ME; MI; MN; NC; ND; NH; NJ; NY; OH; OK; PA; TN; VA; VT; WI; WV; NB; NS; ON; QC;
|
CA |
Discussion | Of conservation concern. (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. Graminifolii |
Sibling taxa | ||
Synonyms | J. canadensis var. brachycephalus | J. megaspermus, J. triformis var. stylosus |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Engelmann |
Web links |