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Juncus
Family: Juncaceae
Juncus image
Sue Carnahan
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Ralph E. Brooks*;Steven E. Clemants*;  in Flora of North America (vol. 22)
Herbs, perennial or rarely annual, rhizomatous or cespitose. Culms round or flattened in cross section. Cataphylls often present at culm base. Leaves: sheaths open; blade flat, channeled, ensiform or terete, sometimes septate, margins involute. Inflorescences terminal or pseudoaxillary, monochasia or dichasia, usually with monochasial branches, cymes or 1--many heads in racemes or panicles; bracteoles 2 or absent. Flowers: tepals (4--)6 in 2 whorls; stamens (2--)3--6. Capsules 1-locular or 3-locular, septicidal. Seeds many, ellipsoid to ovoid, sometimes tailed.
Vascular plants of NE US and adjacent Canada
Tep narrow, lance-subulate to lance-ovate, dry, often firm and even sharp; stamens 6 or 3, opposite the sep when only 3; ovary and fr trilocular, subtrilocular (with incomplete partitions) or unilocular; seeds several to usually numerous (in any case more than 3), commonly ellipsoid or fusiform and minutely apiculate, sometimes with each end prolonged into a slender tail that may be longer than the body; smooth (1 of our spp. scabrous) herbs with usually simple stems and a few flat or terete, basal or cauline lvs, sometimes with bladeless sheaths only, and with a terminal, compact to loosely branched cyme of few-many fls, these solitary, paired, or often in glomerules; lf-sheaths open. 200, cosmop.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Species within checklist: Central Park, New York City
Juncus effusus
Image of Juncus effusus
Juncus pylaei
Image of Juncus pylaei
Juncus tenuis
Image of Juncus tenuis
The National Science Foundation
This project made possible by National Science Foundation Awards 1601697, 1600981, 1601393, 1600976, 1601429, 1601101, 1601503
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