McCoy, Elizabeth (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume LXII (1974)
Marcks, Brian G.
Preliminary reports on the flora of Wisconsin No. 66. Cyperaceae II- sedge family II. The genus Cyperus- the umbrella sedges, pp. 261-284 PDF (8.4 MB)
261PRELIMINARY REPORTS 0-N THE FLORA OF WISCONSIN NO. 66. CYPERACEAE Il—SEDGE FAMILY II. The Genus Cyperus—The Umbrella Sedges Brian G. Marcks University Wisconsin—Madison Cyperus, a vast genus of upwards of 700 species chiefly distributed in warm temperate and tropical regions of the world, - is distinguished from other Cyperaceae by having, in combination, strictly 2-ranked (distichous) scales and terminal umbellate inflorescences or heads. Since the group is technically difficult, examples of inflorescences and their parts have been illustrated in Fig. 1 to aid in the un-derstanding of some of the terminology used in this report. The Wisconsin species flower from midsummer to early fall and occur in dry exposed sandy areas or in various wetland habitats, such as marshes and bogs, swales and low fields, ditches, and lakeshores, riverbanks and streamsides. Several of our species are notable for their widespread distribution. Cyperus aristatus, C. esculentus and C. odoratus are semi-cosmopolitan in tropical and temperate regions, while C. Engelm-annii is widely distributed in the New World. Cyperus strigosus and C. esculentus tend to become weedy in low fields. Phenotypic dwarfing is common and particularly noticeable in depauperate specimens of the ' taller wetland species, including C. strigosus, C. erythrorhizos, C. Engelmannii and C. odoratus. The present paper revises Greene's (1953) preliminary partial treatment of Cyperaceae in Wisconsin, including the genus Cyp-erus. Distribution maps are based on specimens in the herbaria of the University of Wisconsin, Madison (WIS), University of Wisconsin —Milwaukee (UWM), Milwaukee Public Museum (MIL), University of Minnesota (MIN), Field Museum of Natural History (F), Wisconsin State University—Oshkosh (WSO), Wisconsin State University—Stevens Point (WSP), and Northland College, Ashland, Wisconsin (NC). Grateful acknowledgement is -due to the curators of the above herbaria for loans of specimens. The results of my master's and doctoral dissertations, population studies of Cyperus section LAXIGLUMI in the United States (Marcks, 1967, 1972) have been freely incorporated. - Map dots represent exact locations. The map inset numbers record flowering and fruiting dates as determined from specimens housed at the University of Wisconsin, Madison (WIS). Plants in
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