Juncus brachycephalus |
Juncus georgianus |
|
---|---|---|
small-head rush |
Georgia rush |
|
Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, short-lived perennial, cespitose, to 4 dm. |
Culms | erect, 1–4 mm diam., smooth. |
3–40. |
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, 2–3; auricles 0.2–0.3 mm, scarious to membranous; blade flat, 5–15 cm × 0.4–0.7 mm, margins entire. |
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. |
(3–)8–30(–45)-flowered, diffuse, 3–11 cm; primary bract rarely surpassing 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. |
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 | 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, ellipsoid to narrowly so, 2.7–4 × 1.2–1.7 mm. |
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
tan, ellipsoid or widely so, 0.364–0.45 mm, not tailed. |
2n | = 80. |
= ca. 80. |
Juncus brachycephalus |
Juncus georgianus |
|
Phenology | Fruiting summer–early fall. | Flowering and fruiting spring. |
Habitat | Calcareous marshes, wet meadows, and wetland 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 | 100–200 m (300–700 ft) | 300–600 m (1000–2000 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; GA; NC; SC |
Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Poiophylli |
Sibling taxa | ||
Synonyms | J. canadensis var. brachycephalus | |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Coville: Bulletin of the Torrey Botanical Club 22:44. (1895) |
Web links |