Juncus gerardii Loisel.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Stems 2–6 dm, from long, slender rhizomes; lvs elongate, to 2 dm; cauline lvs 1 or 2, the uppermost divergent near the middle of the stem; lf-sheaths entire at the summit; infl 2–8 cm, many-fld, with ascending or erect branches, seldom surpassed by the invol lf; fls prophyllate; tep oblong, purple-brown with green midstrip, the sep 2.4–3.2 mm, narrowed to an obtuse incurved tip, the pet slightly shorter, scarious at the broad obtuse summit; stamens 6, reaching nearly to the tip of the tep, the anthers ca 1.5 mm, 3–4 times as long as the filaments; fr trilocular, ovoid-ellipsoid, 2.4–3.3 mm, rounded above and short-beaked, equaling or barely surpassing the sep; seeds ca 0.5 mm, ellipsoid or obovoid-ellipsoid, longitudinally ribbed; 2n=80, 84. Salt-marshes along the coast; interruptedly circumboreal, s. to Va.; now widely intr. inland in our range, in both saline and disturbed nonsaline habitats.