Juncus brachycephalus |
Juncus texanus |
|
---|---|---|
small-head rush |
Texas rush |
|
Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, perennial, rhizomatous, 2.5–6 dm. |
Rhizomes | 1 mm diam., with swollen nodes. |
|
Culms | erect, 1–4 mm diam., smooth. |
erect, terete, 1–3 mm diam., smooth. |
Cataphylls | 1–2, straw-colored to pink, apex acute. |
0 or 1–2, straw-colored, apex rounded. |
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, cauline 3–5, auricles 1.5–2.5 mm, apex rounded to acutae, scarious; blade straw-colored to green, terete, 5.5–20 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. |
terminal panicles of 2–16 heads, 2.5–6 cm, branches ascending, spreading, or reflexed; primary bract erect to spreading; heads 10–40-flowered, spheric, 11–15 mm diam. |
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 or straw-colored to reddish brown, lance-subulate, apex acuminate; outer tepals (3.5–)4–4.9 mm; inner tepals 3.9–5.4 mm; stamens 6, anthers 2–3 times filament length. |
Capsules | exserted, chestnut to dark brown, imperfectly 3-locular, obconic, 2.4–3.8 mm, apex acute proximal to beak, valves separating at dehiscence. |
exserted, chestnut brown, 1-locular, lance-subulate, 5.2–6.5(–8) mm, apex tapering, valves separating at dehiscence, fertile throughout or only proximal to middle. |
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
obovoid, 0.45–0.5 mm, not tailed; body clear yellow-brown. |
2n | = 80. |
|
Juncus brachycephalus |
Juncus texanus |
|
Phenology | Fruiting summer–early fall. | Fruiting summer. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Swamps, depressions, seeps, sand or gravel bars, and wet mud |
Elevation | 100–200 m (300–700 ft) | 400–600 m (1300–2000 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;
|
LA; OK; TX |
Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Septati |
Sibling taxa | ||
Synonyms | J. canadensis var. brachycephalus | J. nodosus var. texanus |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | (Engelmann) Coville: in J. K. Small, Flora of the Southeastern United States 259. (1903) |
Web links |