Juncus gerardii |
Juncus greenei |
|
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black needle rush, blackgrass, blackgrass rush, Gerard's rush, saltmarsh rush, saltmeadow rush |
Greene's rush, jonc de Greene |
|
Habit | Herbs, perennial, 2–9 dm. | Herbs, perennial, tufted, to 7 dm. |
Rhizomes | long- creeping. |
short, densely branched. |
Culms | 1–30. |
|
Cataphylls | 1–3. |
1–2. |
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, (1–)2–3; auricles (0.2–)0.4–0.6 (–0.8) mm, scarious, rarely ± leathery; ; blade dark green, nearly terete, 5–30 cm × 0.4–0.8 mm, margins entire. |
Inflorescences | 10–30(–80)-flowered, usually loose and somewhat lax, 2–16 cm; primary bract rarely surpassing inflorescence. |
terminal, 5–50-flowered, usually congested, 1–8 cm; primary bract usually surpassing 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. |
bracteoles 2; tepals dark green or darker, lanceolate, 2.5–4.2 mm; outer and inner series nearly equal, apex acute; stamens 6, filaments 0.5–0.8 mm, anthers 0.5–0.8 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. |
chestnut brown or dark brown, infrequently lighter, 3-locular, ellipsoid, (2.5–)2.9–3.5(–4) × (1.1–)1.5–1.8 mm, slightly exceeding tepals, apex somewhat truncate. |
Seeds | dark brown, ellipsoid to lunate, 0.485–0.6(–0.67) mm, not tailed. |
dark tan, ellipsoid to lunate, 0.48–0.65–(0.7) mm, not tailed. |
2n | = ca. 80, 84. |
= ca. 80. |
Juncus gerardii |
Juncus greenei |
|
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 dry, well-drained, sandy soil in pine lands, near lake shores, or among sand dunes and often associated with disturbance |
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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CT; IA; IL; IN; MA; ME; MI; MN; NH; NJ; NY; OH; PA; RI; VT; WI; NB; NS; ON; PE; QC
|
Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Poiophylli | Juncaceae > Juncus > subg. Poiophylli |
Sibling taxa | ||
Synonyms | J. bulbosus var. gerardii, J. fucensis, J. gerardii var. pedicellatus | |
Name authority | Loiseleur-Deslongchamps: J. Bot. (Desvaux) 2: 284. (1809) | Oakes & Tuckerman: American Journal of Science, and Arts 45:37. (1843) |
Web links |
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