Juncus gerardii |
Juncus filiformis |
|
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black needle rush, blackgrass, blackgrass rush, Gerard's rush, saltmarsh rush, saltmeadow rush |
thread rush |
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Habit | Herbs, perennial, 2–9 dm. | Herbs, perennial, 0.2–3.5 dm. |
Rhizomes | long- creeping. |
widely creeping, sparingly branched, 1.5–2 mm diam., nodes closely set. |
Culms | terete, 1 mm diam. |
|
Cataphylls | 1–3. |
several. |
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. |
blade absent. |
Inflorescences | 10–30(–80)-flowered, usually loose and somewhat lax, 2–16 cm; primary bract rarely surpassing inflorescence. |
3–10(–12)-flowered, loosely congested, 1–2 cm; primary bract terete, nearly equaling to much longer than culm. |
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. |
pedicellate; bracteoles broadly ovate, tepals light brown or green, lanceolate, 2.5–4.2 mm; inner series loosely subtending capsule at maturity, slightly shorter, margins scarious; stamens 6, filaments 0.5–0.9 mm, anthers 0.5–0.7 mm; style 0.2 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, nearly globose, 2.5–3 × 1.8–2.1 mm, shorter than perianth. |
Seeds | dark brown, ellipsoid to lunate, 0.485–0.6(–0.67) mm, not tailed. |
amber, 0.5–0.6 mm, not tailed. |
2n | = ca. 80, 84. |
= 40, 70, 80, 84. |
Juncus gerardii |
Juncus filiformis |
|
Phenology | Flowering and fruiting late spring–summer. | Flowering and fruiting summer. |
Habitat | Forming extensive colonies in exposed coastal estuary meadows and salt marshes just above high- tide line, also inland | Usually sandy, moist or wet soil along stream banks, pools, lakes or in meadow depressions, rarely in bogs, frequently hidden by larger vegetation |
Elevation | 0–3000 m (0–9800 ft) | |
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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AK; CO; ID; MA; ME; MI; MN; MT; NE; NH; NJ; NY; OR; PA; UT; VT; WA; WI; WV; WY; AB; BC; MB; NB; NL; NS; NT; NU; ON; PE; QC; SK; YT; SPM; Greenland; Eurasia; Atlantic Islands (Iceland)
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Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Poiophylli | Juncaceae > Juncus > subg. Genuini |
Sibling taxa | ||
Synonyms | J. bulbosus var. gerardii, J. fucensis, J. gerardii var. pedicellatus | |
Name authority | Loiseleur-Deslongchamps: J. Bot. (Desvaux) 2: 284. (1809) | Linnaeus: Sp. Pl. 1: 326. (1753) |
Web links |
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