University of Wisconsin-Madison, Wisconsin State Herbarium
Catalog #: v0200904WIS
Occurrence ID (GUID): 4962934b-b562-4351-9fe5-d027878cd631
Secondary Catalog #: 309368
Taxon: Carex haydenii Dewey
Family: Cyperaceae
Determiner: T.S. Cochrane (1994-06-07)
ID Remarks: A Terminal one to several spikes in sect. Phacocystis are normally staminate, but as noted in Mackenzieé monograph (Part 6, 1935) are rarely gynaecandrous or (not noted by Mackenzie) androgynous or even mostly pistillate with the perigynia in the middle. This collection is different yet, having one culm with the terminal spike gynaecandrous, two with the terminal spike gynaecandrous plus with four or five pistillate flowers at the base. The subterminal spikes are staminate or androgynous or on one culm reduced to a single pistillate flower. Ligules in Carex haydenii, as shown in the case of a single herbarium collection (Ballard Q Stuart 94-003, six sheets), vary from wider than high to as high as wide or higher than wide. Perigynia in the collection at hand (94-001+) are 2.1-2.4 X 1.6-1.9 mm, typical for Q. haydenii, but Wisconsin accessions with mature perigynia often have them only 1.7-1.9 X 1.3-1.6 mm, smaller than stated in treatments of the genus. In these and other morphological characters ( sheaths in Q. haydenii are often filamentose) the range of variation within Q. haydenii is greater than generally realized. (Such variation induced Fernald (1950) to report an excessive number of hybrids in North American Carex.) Carex haydenii does exhibit characteristics in common with Q. buxbaumii, and the two are also sympatric, but I ca not agree that the one collection at hand (94-004, two sheets) bears attributes intermediate toward C. buxbaumii, i.e. , it does not comprise hybrid material; morphology seemingly intermediate between two species
Collector: Ballard, Harvey E., Jr.   94-004   
Date: 1994-05-30
Verbatim Date: 30 May 1994
Additional Collectors: Stuart, Andrew
Locality: United States, Wisconsin, Adams, Preston, Pipeline intersection with Cree Ave.
Verbatim Coordinates: TRS: T18N R6E sec 14 N border of NE1/2 of NW1/4
Habitat: with and near beds of other Carex species near road
Substrate: moist, sandy muck
Associated Species: Carex buxbaumii, Carex emoryi (?)
Specimen Images
Record Id: 4962934b-b562-4351-9fe5-d027878cd631
For additional information on this specimen, please contact: Kenneth M. Cameron (
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