Juncus tenuis |
Juncus brachyphyllus |
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path rush, poverty or slender rush, poverty rush, slender rush |
short leaf rush, tuftedstem rush |
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Habit | Herbs, perennial, tufted, 1.5–5 dm. | Herbs, perennial, cespitose, to 8 dm. |
Rhizomes | densely branching. |
densely branching. |
Culms | few–20. |
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Cataphylls | 1–2. |
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Leaves | basal, (1–)2–3; auricles 2–5 mm, apex acute, membranous; blade flat, 3–12 cm × 0.5–1 mm, margins entire. |
basal, 2–5; auricles 0.4–1.1(–2) mm, scarious; blade flat, 9–25 cm × 0.8–1.5(–2.4) mm, margins entire wide, becoming involute under xeric conditions. |
Inflorescences | 5–40-flowered, borne congested or branch internodes ca. as long as tepals, ssomewhat loose, 1–5 cm; primary bract usually longer than inflorescence. |
10–150-flowered, usually congested, 1.5–8 cm; primary bract usually longer than inflorescence. |
Flowers | bracteoles 2; tepals greenish, lanceolate, 3.3–4.4 mm; outer and inner series nearly equal; stamens 6, filaments 0.5–0.9 mm, anthers 0.1–0.2 mm; style 0.1–0.2 mm. |
bracteoles 2; tepals green to tannish, lanceolate, 3.5–5.7 mm; outer and inner series nearly equal, in fruit apex appressed to capsule; stamens 6, filaments 0.6–1.1 mm, anthers 0.56–0.91 mm; style 0.2 mm. |
Capsules | tan or light brown, 1-locular to pseudo-3-locular, ellipsoid, (3.3–)3.8–4.7 × (1.1–)1.3–1.7 mm, nearly equal to tepals. |
dark tan to reddish brown, 3-locular, ellipsoid to narrowly so, 2.6–4.7 × 1.3–2 mm, barely shorter than tepals. |
Seeds | tan, ellipsoid to lunate, (0.52–)5.5–0.65(–0.7) mm, not tailed. |
tan, ellipsoid to lunate, (0.32–)0.45–0.52(–0.65) mm, not tailed. |
2n | = 80. |
= ca. 80. |
Juncus tenuis |
Juncus brachyphyllus |
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Phenology | Flowering spring–early summer. | Flowering and fruiting late spring–early summer. |
Habitat | Exposed or shaded sites in soils ranging from sandy to clayey under moist or drier conditions, oftentimes these sites naturally or otherwise disturbed (e.g., game or human trails) | Exposed moist or wet soils associated with depressions in temporal wetlands, along stream banks or lake shores especially in sandy soils |
Elevation | 900–1650 m (3000–5400 ft) | |
Distribution |
AK; AL; AR; AZ; CA; CO; CT; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NS; ON; PE; QC; SK [Introduced worldwide]
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AR; CA; ID; KS; LA; MO; MT; NE; OK; OR; WA; Texas
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Discussion | Juncus tenuis occurs throughout North America. It is particularly abundant in northeastern United States and eastern Canada, although infrequent in the south and west. Through the use of isozyme electrophoresis, hybridization can be demonstrated between various members of the Juncus tenuis complex, including Juncus tenuis, J. anthelatus, J. interior, J. secundus, and J. dichotomus (R. E. Brooks, unpubl.). Juncus ××oronensis is thought to be a hybrid between J. tenuis and J. vaseyi in the northeast. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Poiophylli | Juncaceae > Juncus > subg. Poiophylli |
Sibling taxa | ||
Synonyms | J. bicornis, J. bicornis var. williamsii, J. macer, J. macer, J. macer var. williamsii, J. tenuis var. bicornis, J. tenuis var. multicornis, J. tenuis var. williamsii | J. kansanus |
Name authority | Willdenow: Sp. Pl. 2(1): 214. (1799) | Wiegand: Bulletin of the Torrey Botanical Club 27: 519. (1900) |
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