There are 4 verified occurrences, 8 historical occurrences.
Most occurrences of Slender Bulrush in New York occur in emergent marshes along slow-moving creeks or rivers, often at their mouths, in water depths of up to a meter (New York Natural Heritage Program 2011). Fresh, often calcareous marshes and lakes, often emergent in water to 1.5 m (FNA 2002). Margins of freshwater lakes and streams (Gleason & Cronquist 1991). Calcareous or other basic deadwaters, shores and swamps (Fernald 1970).
Scattered but mostly east and west of Adirondacks.
Distinguishing characteristics: culms slender; inflorescence panicle with ascending to spreading very slender smooth to barely scabrous rays; bractlets whitish-brown, glabrous; spikelets mostly solitary, peduncled, rather few flowered, pale brown to drab or whitish-green, lance-acuminate to slenderly ellipsoid, acute to subacuminate, 0.75-2.3 cm long; scales glabrous, firm or subcoriaceous, much exceeding the achenes; bristles 2-4 (mostly 2), fragile, unequal, shorter than the achene; style 3-cleft; achenes unequally trigonous (twice as broad as thick). Best life stage for ID: in fruit. Characteristics needed to ID: mature achenes.
Scirpus acutus Muhl. has stouter stems; the inflorescence panicle is stiffer with relatively fewer rays; the spikelets are mostly in glomerules; scales are deep brown or reddish and more or less viscid-pubescent; the flowers are bicarpellate and achenes plano-convex, or occasionally some tricarpellate and unequally trigonous. Scirpus validus Vahl. stems are soft and easily crushed between the fingers; the inflorescence tends to be more open with drooping rays; spikelets are smaller (seldom over 1 cm); the scales are deep brown or reddish, about as long as the achenes; achenes are plano-convex.
Flowers in June, fruits in July to early August.
The time of year you would expect to find Slender Bulrush flowering and fruiting in New York.
Schoenoplectus heterochaetus (Chase) Soják
Fernald, M.L. 1950. Gray's manual of botany. 8th edition. D. Van Nostrand, New York. 1632 pp.
Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. The New York Botanical Garden, Bronx, New York. 910 pp.
Holmgren, Noel. 1998. The Illustrated Companion to Gleason and Cronquist's Manual. Illustrations of the Vascular Plants of Northeastern United States and Adjacent Canada. The New York Botanical Garden, Bronx, New York.
Mitchell, Richard S. and Gordon C. Tucker. 1997. Revised Checklist of New York State Plants. Contributions to a Flora of New York State. Checklist IV. Bulletin No. 490. New York State Museum. Albany, NY. 400 pp.
New York Natural Heritage Program. 2022. New York Natural Heritage Program Databases. Albany, NY.
Reschke, Carol. 1990. Ecological communities of New York State. New York Natural Heritage Program, New York State Department of Environmental Conservation. Latham, NY. 96 pp. plus xi.
Weldy, T. and D. Werier. 2010. New York flora atlas. [S.M. Landry, K.N. Campbell, and L.D. Mabe (original application development), Florida Center for Community Design and Research http://www.fccdr.usf.edu/. University of South Florida http://www.usf.edu/]. New York Flora Association http://newyork.plantatlas.usf.edu/, Albany, New York
Information for this guide was last updated on: August 9, 2011
Please cite this page as:
New York Natural Heritage Program. 2022. Online Conservation Guide for Schoenoplectus heterochaetus. Available from: https://guides.nynhp.org/slender-bulrush/. Accessed May 16, 2022.