Roggman Boreal Slopes; Clayton County, Iowa; Iowa flora; The Nature Conservancy; endangered species; boreal species; relict species; Aconitum noveboracense Gray
Charles and Anna Roggman Boreal Slopes is a 20 acre (8.1 ha) Nature Conservancy preserve situated on the floodplain and adjacent northfacing slope of a tributary of Buck Creek in Clayton County, northeastern Iowa. My study of the preserve in 1981 revealed a vascular flora of 160 species representing 59 families. Three plant communities were recognized: ash-elm on the floodplain, maple-basswood on the slope, and an unusual "boreal slope" community in areas of the slope with cold air drainage. The last contains several species with boreal American or circumboreal distributions which have probably persisted since the Pleistocene. Eleven species protected by state and federal laws inhabit the preserve. The most significant is Aconitum noveboracense Gray, known from only 17 localities worldwide, listed as endangered in Iowa and as threatened in the United States.
Proceedings of the Iowa Academy of Science
© Copyright 1983 by the Iowa Academy of Science, Inc.
Lammers, Thomas G.
"The Vascular Flora of Roggman Boreal Slopes Preserve, Clayton County, Iowa,"
Proceedings of the Iowa Academy of Science: Vol. 90:
, Article 9.
Available at: http://scholarworks.uni.edu/pias/vol90/iss3/9