Juncus brachycephalus |
Juncus repens |
|
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small-head rush |
creeping rush, lesser creeping rush |
|
Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, perennial, cespitose, floriferous culm 0.5–3 dm. |
Culms | erect, 1–4 mm diam., smooth. |
first ascending, soon arcuate-stoloniferous and creeping or floating, or growing submersed along bottom, each node with cluster of basal leaves and fibrous roots, eventually each emergent terrestrial node with floriferous culm. |
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; auricles 0.5–1 mm, apex acutish, membranous or thicker; blade spreading, flat, 2–10(–15) cm × 1–3 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–)2–10, each with 3–12 flowers, open; primary bract usually 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 green, margins scarious; inner series narrowly lanceolate, 5–9 mm, apex usually recurved; outer series obviously shorter, apex usually erect; stamens 3, filaments 1.5–3 mm, anthers 0.5–0.8 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, 3-locular, narrowly ellipsoid, 3.5–5.5 × 0.8–1.2 mm. |
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
brown, ovoid, 0.3–0.4 mm, not tailed. |
2n | = 80. |
|
Juncus brachycephalus |
Juncus repens |
|
Phenology | Fruiting summer–early fall. | Flowering and fruiting summer–fall. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Shores of ponds, lakes, and borrow pits, flatwood depressions, ditches, and drainage canals |
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; DE; FL; GA; LA; MD; MS; NC; OK; SC; TN; TX; VA; Mexico (Tabasco); West Indies (Cuba)
|
Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Graminifolii |
Sibling taxa | ||
Synonyms | J. canadensis var. brachycephalus | |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Michaux: Flora Boreali-Americana 1: 191. (1803) |
Web links |