Juncus brachycephalus |
Juncus hallii |
|
---|---|---|
small-head rush |
Hall's rush |
|
Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, perennial, strongly tufted, to 4 dm. |
Rhizomes | densely short-branched. |
|
Culms | erect, 1–4 mm diam., smooth. |
terete. |
Cataphylls | 1–2, straw-colored to pink, apex acute. |
several. |
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. |
auricles 0.2 mm, apex acutish to rounded, scarious; blade 4–15 cm. |
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. |
2–7-flowered, loose to congested; 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. |
pedicellate; bracteoles ovate; tepals light brown with green midstripe, lanceolate or widely so, 4–5 mm, margins scarious; inner series loosely subtending capsule at maturity, shorter; stamens 6, filaments 0.8 mm, anthers 0.8–1.1 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. |
brown, 3-locular, oblong-ovoid, 3.5–5 × 1.5–1.9 mm, slightly exceeding perianth. |
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
amber, body 0.5 mm, tails 0.3 mm. |
2n | = 80. |
|
Juncus brachycephalus |
Juncus hallii |
|
Phenology | Fruiting summer–early fall. | Flowering and fruiting summer. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Exposed slopes, stream banks, and meadows in montane and alpine areas |
Elevation | 100–200 m (300–700 ft) | 1600–3000 m (5200–9800 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;
|
CO; ID; MT; UT; WA; WY |
Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Genuini |
Sibling taxa | ||
Synonyms | J. canadensis var. brachycephalus | |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Engelmann |
Web links |