Juncus brachycephalus |
Juncus coriaceus |
|
---|---|---|
small-head rush |
leathery rush |
|
Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, perennial, tufted, 3–9 dm. |
Rhizomes | densely branching. |
|
Culms | erect, 1–4 mm diam., smooth. |
few to many. |
Cataphylls | 1–2, straw-colored to pink, apex acute. |
1–3. |
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, 0–1(–2); auricles 0.2–0.4(–0.6) mm, scarious to leathery; blade nearly terete but slightly channeled adaxially, 10–50 cm × 0.7–1.8 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. |
falsely lateral, 5–35-flowered, loose to congested, 1–8 cm; primary bract exceeding 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. |
pedicels 0.5–2.5 mm; bracteoles 2; tepals dark green, lanceolate, 3.5–5 mm; inner series slightly shorter, apex acute; stamens 6, fewer in cleistogamous flowers, filaments 0.8–1.2 mm, anthers 0.5–1.1 mm; style 0.9–1.3 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. |
light to dark brown, 1-locular, widely ovoid to nearly globose, 3.5–5 × 2.6–3.2 mm. |
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
light to dark brown, oblate, 0.55–0.73 mm, not tailed. |
2n | = 80. |
= 80. |
Juncus brachycephalus |
Juncus coriaceus |
|
Phenology | Fruiting summer–early fall. | Flowering and fruiting spring–early summer. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Springy, wet woodlands, stream banks, marshy areas, flatwood depressions, and shaded or exposed disturbed, sites with poor drainage |
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; KY; LA; MD; MS; NC; NJ; NY; OK; SC; TN; VA; Texas
|
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) | Mackenzie: Bulletin of the Torrey Botanical Club 56:28. (1929) |
Web links |