Juncus gerardii |
Juncus repens |
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black needle rush, blackgrass, blackgrass rush, Gerard's rush, saltmarsh rush, saltmeadow rush |
creeping rush, lesser creeping rush |
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Habit | Herbs, perennial, 2–9 dm. | Herbs, perennial, cespitose, floriferous culm 0.5–3 dm. |
Rhizomes | long- creeping. |
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Culms | first ascending, soon arcuate-stoloniferous and creeping or floating, or growing submersed along bottom, each node with cluster of basal leaves and fibrous roots, eventually each emergent terrestrial node with floriferous culm. |
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Cataphylls | 1–3. |
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Leaves | basal, (1–)2–4; auricles 0.4–0.6(–0.8) mm, scarious; blade flat or somewhat channeled, 10–40 cm × 0.4–0.7 mm, margins entire. |
basal; auricles 0.5–1 mm, apex acutish, membranous or thicker; blade spreading, flat, 2–10(–15) cm × 1–3 mm. |
Inflorescences | 10–30(–80)-flowered, usually loose and somewhat lax, 2–16 cm; primary bract rarely surpassing inflorescence. |
glomerules, (1–)2–10, each with 3–12 flowers, open; primary bract usually shorter than inflorescence. |
Flowers | bracteoles 2; tepals dark brown or blackish, lanceolate-ovate to oblong, 2.6–3.2(–3.8) mm; inner and outer series nearly equal, apex obtuse; stamens 6, filaments 0.4–0.7 mm, anthers 1.1–1.6(–1.8) mm; style 0.4 mm. |
tepals green, margins scarious; inner series narrowly lanceolate, 5–9 mm, apex usually recurved; outer series obviously shorter, apex usually erect; stamens 3, filaments 1.5–3 mm, anthers 0.5–0.8 mm; style 0.5 mm. |
Capsules | chestnut brown or brown, 3-locular, widely ellipsoid, (2.2–)2.5–3.2(–3.5) × 1.3–1.9 mm. |
tan, 3-locular, narrowly ellipsoid, 3.5–5.5 × 0.8–1.2 mm. |
Seeds | dark brown, ellipsoid to lunate, 0.485–0.6(–0.67) mm, not tailed. |
brown, ovoid, 0.3–0.4 mm, not tailed. |
2n | = ca. 80, 84. |
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Juncus gerardii |
Juncus repens |
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Phenology | Flowering and fruiting late spring–summer. | Flowering and fruiting summer–fall. |
Habitat | Forming extensive colonies in exposed coastal estuary meadows and salt marshes just above high- tide line, also inland | Shores of ponds, lakes, and borrow pits, flatwood depressions, ditches, and drainage canals |
Distribution |
CO; CT; DE; IL; IN; KS; KY; MA; MD; ME; MI; MN; MO; MT; ND; NH; NJ; NY; OH; OR; OR; PA; RI; UT; VA; VT; WA; WI; BC; MB; NB; NF; NS; ON; PE; QC; SPM; Greenland; Europe; Asia
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AL; AR; DE; FL; GA; LA; MD; MS; NC; OK; SC; TN; TX; VA; Mexico (Tabasco); West Indies (Cuba)
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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. bulbosus var. gerardii, J. fucensis, J. gerardii var. pedicellatus | |
Name authority | Loiseleur-Deslongchamps: J. Bot. (Desvaux) 2: 284. (1809) | Michaux: Flora Boreali-Americana 1: 191. (1803) |
Web links |
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