Juncus brachycephalus |
Juncus filipendulus |
|
---|---|---|
small-head rush |
ringseed rush |
|
Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, perennial, tufted, 1.5–3.5 dm. |
Rhizomes | poorly developed. |
|
Culms | erect, 1–4 mm diam., smooth. |
erect, compressed, bases often swollen. |
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. |
basal 2–4, cauline 1–3; auricles 0.5–1 mm, apex rounded to nearly acute; blade flat, 3–15 cm × 1–2.5 mm. |
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. |
glomerules, (1–)2–5(–10), each with (3–)6–15 flowers, open; primary bract shorter than inflorescence. |
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 straw-colored with green midstripe, lanceolate or widely so, 3.5–5 mm, margins sometimes clear; outer and inner series nearly equal; stamens 3, filaments 1.5 mm, anthers 0.5 mm; style 0.5 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. |
tan to reddish brown, 3-locular, obovoid, 2.6–3.2 mm, shorter than perianth. |
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
fusiform, 0.5–0.6 mm, not tailed. |
2n | = 80. |
|
Juncus brachycephalus |
Juncus filipendulus |
|
Phenology | Fruiting summer–early fall. | Flowering and fruiting spring–early summer. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Moist, usually calcareous soils of swales or glades, occasionally in shallow water along streams |
Elevation | 100–200 m (300–700 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;
|
AL; AR; GA; KY; LA; MS; OK; TN; TX
|
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. leptocaulis |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Buckley: Proceedings of the Academy of Natural Sciences of Philadelphia 14: 8. (1862) |
Web links |