Juncus tenuis |
Juncus orthophyllus |
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path rush, poverty or slender rush, poverty rush, slender rush |
straight-leaf rush |
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Habit | Herbs, perennial, tufted, 1.5–5 dm. | Herbs, perennial, 2–4 dm. |
Rhizomes | densely branching. |
creeping. |
Culms | few–20. |
compressed. |
Leaves | basal, (1–)2–3; auricles 2–5 mm, apex acute, membranous; blade flat, 3–12 cm × 0.5–1 mm, margins entire. |
basal several, cauline 0–3; auricles, if present, 0.5–1 mm, apex acutish; blade flat, basal 10–40 cm × 1–6 mm, cauline blade reduced. |
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, usually 3–12, each with 5–10 flowers, open; primary bract much 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 brown, lanceolate, 5–6 mm, apex obtuse; outer series shorter, margins scarious, apex acute, minutely papillose; inner series with margins clear; stamens 6, filaments 0.5–1 mm, anthers 1.6–2.4(–3) mm; style 0.5–2 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. |
tan, 3-locular, obovoid, 3–5 mm, shorter than perianth. |
Seeds | tan, ellipsoid to lunate, (0.52–)5.5–0.65(–0.7) mm, not tailed. |
ovoid, 0.6 mm, not tailed. |
2n | = 80. |
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Juncus tenuis |
Juncus orthophyllus |
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Phenology | Flowering spring–early summer. | Flowering and fruiting late spring to 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 ground in mountain meadows |
Elevation | 1200–3500 m (3900–11500 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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CA; ID; MT; NV; OR; WA; BC
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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. longistylis var. latifolius, J. latifolius |
Name authority | Willdenow: Sp. Pl. 2(1): 214. (1799) | Coville: Contributions from the U. S. National Herbarium 4: 207. (1893) |
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