Juncus brachycephalus |
Juncus scirpoides |
|
---|---|---|
small-head rush |
needlepod rush, scirpuslike rush |
|
Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, perennial, rhizomatous, tosometimes nearly cespitose, 0.8–7 dm. |
Rhizomes | usually tuberous, 2–4 mm diam. |
|
Culms | erect, 1–4 mm diam., smooth. |
erect, terete, 1–3 mm diam., smooth. |
Cataphylls | 1–2, straw-colored to pink, apex acute. |
0–1. |
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 1–2, cauline 2–3, green; auricles 1–2 mm, apex rounded, membranaceous; blade terete, 2–23 cm × 1–2 mm, distal cauline leaf blade 1.6–26 cm, equaling or longer than sheath. |
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 1–23(–32) heads, 2.5–9 cm, branches ascending to erect; primary bracts erect; heads 20–60-flowered, spheric or usually lobed, 6–11 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 to straw-colored, lance-subulate, 2–3.5 mm, nearly equal, apex acuminate; stamens 3, anthers 1/3 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, straw-colored, 1-locular, lance-subulate, 3–4 mm, apex tapering, remaining attached at tip, valves not 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. |
oblong, 0.4 mm, not tailed; body clear yellow-brown. |
2n | = 80. |
|
Juncus brachycephalus |
Juncus scirpoides |
|
Phenology | Fruiting summer–early fall. | Fruiting early summer–fall. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Wet sandy soil, salt marshes, lake shores, ditches, meadows, wet woods |
Elevation | 100–200 m (300–700 ft) | 0–1400 m (0–4600 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; DC; DE; FL; GA; IL; IN; KS; KY; LA; MD; MI; MO; MS; NC; NE; NJ; NY; OK; PA; SC; TN; TX; WV; Va
|
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. echinatus, J. scirpoides var. compositus, J. scirpoides var. genuinus, J. scirpoides var. macrostemon, J. scirpoides var. meridionalis |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Lamarck: in J. Lamarck et al., Encycl. 3: 267. (1789) |
Web links |