Juncus brachycephalus |
Juncus brachyphyllus |
|
---|---|---|
small-head rush |
short leaf rush, tuftedstem rush |
|
Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, perennial, cespitose, to 8 dm. |
Rhizomes | densely branching. |
|
Culms | erect, 1–4 mm diam., smooth. |
|
Cataphylls | 1–2, straw-colored to pink, apex acute. |
1–2. |
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, 2–5; auricles 0.4–1.1(–2) mm, scarious; blade flat, 9–25 cm × 0.8–1.5(–2.4) mm, margins entire wide, becoming involute under xeric conditions. |
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. |
10–150-flowered, usually congested, 1.5–8 cm; primary bract usually longer 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. |
bracteoles 2; tepals green to tannish, lanceolate, 3.5–5.7 mm; outer and inner series nearly equal, in fruit apex appressed to capsule; stamens 6, filaments 0.6–1.1 mm, anthers 0.56–0.91 mm; style 0.2 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. |
dark tan to reddish brown, 3-locular, ellipsoid to narrowly so, 2.6–4.7 × 1.3–2 mm, barely shorter than tepals. |
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
tan, ellipsoid to lunate, (0.32–)0.45–0.52(–0.65) mm, not tailed. |
2n | = 80. |
= ca. 80. |
Juncus brachycephalus |
Juncus brachyphyllus |
|
Phenology | Fruiting summer–early fall. | Flowering and fruiting late spring–early summer. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Exposed moist or wet soils associated with depressions in temporal wetlands, along stream banks or lake shores especially in sandy soils |
Elevation | 100–200 m (300–700 ft) | 900–1650 m (3000–5400 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;
|
AR; CA; ID; KS; LA; MO; MT; NE; OK; OR; WA; 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 | J. kansanus |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Wiegand: Bulletin of the Torrey Botanical Club 27: 519. (1900) |
Web links |