Juncus brachycephalus |
Juncus kelloggii |
|
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small-head rush |
Kellogg's dwarf rush, Kellogg's rush |
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Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, annual, cespitose, 0.1–0.55(–0.65) dm. |
Culms | erect, 1–4 mm diam., smooth. |
to 100. |
Cataphylls | 1–2, straw-colored to pink, apex acute. |
|
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. |
to 2.5 cm × 0.1–0.3 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 clusters, each with 1–4 flowers; bracts subtending inflorescence 2–5, ovate to lanceolate, inconspicuous, 1–2.5 mm, membranous, apex acute to obtuse. |
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. |
3-merous; : tepals dark reddish brown, 2–3.2 × 0.4–1 mm, margins unpigmented; inner series nearly equal to or slightly shorter than outer series, acute to acuminate; stamens 3, filaments 0.7–1.3 mm, anthers 0.3–0.5 mm; style 0.2–0.5 mm, stigma 0.4–1.3 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. |
dark reddish, 3-locular, obovoid to ellipsoid, nearly equal to tepals, 1.8–2.9 × 1.2–1.6 mm. |
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
ovoid, 0.4–0.55 mm, apiculate. |
n | = 17. |
|
2n | = 80. |
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Juncus brachycephalus |
Juncus kelloggii |
|
Phenology | Fruiting summer–early fall. | Flowering and fruiting spring–early summer. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Sandy and clayey damp soils around vernal pools, seepage areas, and low spots in fields and meadows |
Elevation | 100–200 m (300–700 ft) | 0–800 m (0–2600 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;
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CA; NV; OR; WA; BC
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Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Septati | Juncaceae > Juncus > subg. Graminifolii |
Sibling taxa | ||
Synonyms | J. canadensis var. brachycephalus | J. triformis var. brachystylus |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Engelmann |
Web links |
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