The Distribution and Reproductive Phenology of the Milkweeds (Asclepiadaceae: Asclepias and Cynanchum) in Nebraska

Authors

Robert B. Kaul, University of Nebraska - LincolnFollow
Steven B. Rolfsmeier, University of Nebraska - Lincoln
Jeffrey J. Esch, University of Nebraska - Lincoln

Date of this Version

1991

Comments

1991. Transactions of the Nebraska Academy of Sciences, XVIII: 127-140. Copyright © 1991, Kaul, Rolfsmeier, and Esch.

Abstract

The Asclepiadaceae are represented in Nebraska by seventeen native species of Asclepias and one of Cynanchum. Two species are here added to the State's flora: Asclepias asperula and A. purpurascens. Detailed county distribution maps are presented for all species based upon our extensive field and herbarium work, and numerous additions and corrections are made to the maps published in the Atlas of the Flora of the Great Plains in 1977. A map is presented showing the zone of hybridization of A. speciosa with A. syriaca in central Nebraska. Data are given on flowering and fruiting phenology for each species, and floral odors are described.