Juncus tenuis |
Juncus filipendulus |
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path rush, poverty or slender rush, poverty rush, slender rush |
ringseed rush |
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Habit | Herbs, perennial, tufted, 1.5–5 dm. | Herbs, perennial, tufted, 1.5–3.5 dm. |
Rhizomes | densely branching. |
poorly developed. |
Culms | few–20. |
erect, compressed, bases often swollen. |
Leaves | basal, (1–)2–3; auricles 2–5 mm, apex acute, membranous; blade flat, 3–12 cm × 0.5–1 mm, margins entire. |
basal 2–4, cauline 1–3; auricles 0.5–1 mm, apex rounded to nearly acute; blade flat, 3–15 cm × 1–2.5 mm. |
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. |
glomerules, (1–)2–5(–10), each with (3–)6–15 flowers, open; primary bract shorter 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. |
tepals straw-colored with green midstripe, lanceolate or widely so, 3.5–5 mm, margins sometimes clear; outer and inner series nearly equal; stamens 3, filaments 1.5 mm, anthers 0.5 mm; style 0.5 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. |
tan to reddish brown, 3-locular, obovoid, 2.6–3.2 mm, shorter than perianth. |
Seeds | tan, ellipsoid to lunate, (0.52–)5.5–0.65(–0.7) mm, not tailed. |
fusiform, 0.5–0.6 mm, not tailed. |
2n | = 80. |
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Juncus tenuis |
Juncus filipendulus |
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Phenology | Flowering spring–early summer. | Flowering and fruiting 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) | Moist, usually calcareous soils of swales or glades, occasionally in shallow water along streams |
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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AL; AR; GA; KY; LA; MS; OK; TN; TX
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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. Graminifolii |
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. leptocaulis |
Name authority | Willdenow: Sp. Pl. 2(1): 214. (1799) | Buckley: Proceedings of the Academy of Natural Sciences of Philadelphia 14: 8. (1862) |
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