Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
61. Juncaceae, the Rush Family
1. Juncus L. -- Rush
14. Juncus nodosus L. -- Jointed rush
Slender rhizomatous perennial 1.5-5 dm tall. Leaves cauline and basal,
the upper ones and the main involucre usually overtopping the inflorescence;
blades terete, hollow, nodulose-septate, 0.5-1.5(2) mm wide when pressed;
sheaths green, the margins green, becoming yellowish and membranous toward
the summit; auricles membranous, yellowish, 0.5-1.5 mm long. Inflorescence
usually oblong, 2-6 cm long, sparingly branched, the branches ascending, each
branch terminated with a glomerule; glomerules (1)2-several, spherical
at maturity, many-flowered, 1 cm or less across. Flowers greenish to
brown, 3-4 mm long; tepals attenuate, the margins very narrowly hyaline,
the outer and inner equal in length or nearly so; stamens 6. Capsules
subulate, 1-locular, exceeding the perianth, dehiscing from the base and remaining
coherent at the tip; seeds cylindric-ellipsoid, pale brown to brown,
ca. 0.4 mm long, apiculate on the ends. Jul--Sep. Wet meadows, springs, fens,
shores and stream banks, where water is fresh; frequent; (Newf. and N.S. to
Mack. and B.C., s to VA, OH, IN, IA, NE, CO, NM and CA).
See notes under J. alpinus and J. torreyi.
Next Section -- Juncus marginatus Rostk. -- Grassleaf
Return to Family -- Juncaceae - The Rush Family
Next Section -- Juncus scirpoides Lam.