Juncus brachycephalus |
Juncus interior |
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small-head rush |
inland rush, interior juncus, interior rush |
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Habit | Herbs, perennial, cespitose, 2–7 dm. | Herbs, perennial, tufted, 2–6 dm. |
Rhizomes | densely branching. |
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Culms | erect, 1–4 mm diam., smooth. |
1–10. |
Cataphylls | 1–2, straw-colored to pink, apex acute. |
1–3. |
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(–3); auricles whitish or purplish tinged, 0.2–0.4(–0.6) mm, scarious; blade flat, 5–15 cm × 0.5–1.1 mm, margins entire. |
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. |
usually somewhat compact, 1.5–7 cm; primary bract usually shorter 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 greenish, lanceolate, 3.3–4.4 mm, apex acuminate; stamens 6, filaments 0.5–0.9 mm, anthers 0.4–0.6 mm; style 0.1–0.2 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. |
light tan or darker, 1-locular to pseudo-3-locular, ellipsoid to nearly globose, (3.3–)3.8–4.7 mm, nearly equal to or longer than tepals. |
Seeds | ellipsoid to fusiform, 0.8–1.2 mm, tailed; body covered with whitish translucent veil. |
tan, ellipsoid to lunate, 0.436–0.73 mm, not tailed. |
2n | = 80. |
= 80. |
Juncus brachycephalus |
Juncus interior |
|
Phenology | Fruiting summer–early fall. | Flowering and fruiting late spring–early summer. |
Habitat | Calcareous marshes, wet meadows, and wetland shores | Dry, often upland sites in prairies, exposed disturbed sites, and ditches in sandy or clayey soils |
Elevation | 100–200 m (300–700 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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AR; AZ; CO; IA; IL; IN; KS; KY; LA; MN; MO; MT; ND; NE; NM; OH; OK; SD; TN; UT; WI; WY; AB; MB; ON; QC; SK; Texas
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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. arizonicus, J. interior var. arizonicus, J. interior var. neomexicanus, J. monostichus, J. neomexicanus |
Name authority | (Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 268. (1890) | Wiegand: Bulletin of the Torrey Botanical Club 27: 516. (1900) |
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