Juncus tenuis |
Juncus bryoides |
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path rush, poverty or slender rush, poverty rush, slender rush |
moss rush, mosslike dwarf rush |
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Habit | Herbs, perennial, tufted, 1.5–5 dm. | Herbs, annual, cespitose, 0.03–0.25 dm. |
Rhizomes | densely branching. |
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Culms | few–20. |
to 150, 0.1–0.2 mm wide. |
Leaves | basal, (1–)2–3; auricles 2–5 mm, apex acute, membranous; blade flat, 3–12 cm × 0.5–1 mm, margins entire. |
to 0.9 cm, 1/4–1 times height of plant. |
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. |
terminal solitary flowers; bracts subtending inflorescence (1–)2, ovate, inconspicuous, 0.3–0.9 mm, membranous, apex acute. |
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. |
3-merous; : tepals (4–)6(–8), turning inward to enwrap shorter capsule at maturity, chestnut brown to black, lanceolate to oblong, 1.2–2.3(–2.8) × 0.4–0.6 mm; ; outer and inner series nearly equal, acute to acuminate; stamens 3, filaments 0.3–0.6 mm, anthers 0.15–0.25 mm; style 0.1 mm, stigma 0.2–0.3 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. |
pale reddish, 3-locular, ovoid to ellipsoid, 1–1.9 mm × 0.5–1 mm. |
Seeds | tan, ellipsoid to lunate, (0.52–)5.5–0.65(–0.7) mm, not tailed. |
ovoid to globose, 0.3–0.5 mm. |
2n | = 80. |
= ca. 38. |
Juncus tenuis |
Juncus bryoides |
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Phenology | Flowering spring–early summer. | Flowering and fruiting spring–mid 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) | Usually fine, sandy soil of washes, swales in meadows, and seepage areas on rock outcrops |
Elevation | 600–3600 m (2000–11800 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; CO; ID; NV; OR; UT; Mexico
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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 | |
Name authority | Willdenow: Sp. Pl. 2(1): 214. (1799) | F. J. Hermann: Leaflets of Western Botany 5: 117. (1948) |
Web links |
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