Wallace R. Weber

(Department of Biology)


William T. Corcoran

(Department of Geography)


Mark S. Brunell

(Department of Biology)




Paul L. Redfearn, Jr.

(Department of Biology)


Prepared for




November, 2000




A Contribution of the Ozarks Regional Herbarium, Department of Biology, Missouri State University, Springfield, Missouri, 65897.




 Kay and GeorgeYatskievych and Wally Weber, 1987




Wallace R. Weber, William T. Corcoran, Mark S. Brunell and Paul L. Redfearn, Jr.

November, 2000


During the thirty-seven years since the publication of Steyermark's Flora of Missouri (1963), botanists have continued the process of documenting the number and range of plant taxa in Missouri. As an outlet for this new information, Missouriensis, the Journal of the Missouri Native Plant Society, commenced publication of a Botanical Record section in 1981 with Wallace Weber as editor.  Associate editors have included Doug Ladd, Jay Reveill, Jon Rebman and William Corcoran.  In 1990 the publication of the Catalogue of the Flora of Missouri (Yatskievych and Turner, 1990) updated nomenclature and documented over 100 new taxa for Missouri.  Publication of Steyermark's Flora of Missouri, Volume 1 (Yatskievych, 1999) made further changes in nomenclature and addition of new taxa. This Atlas of Missouri Vascular Plants incorporates all the changes included in these previous publications as well as new taxa and county records published by Henderson (1980) and Mühlenbach (1979, 1983).  This Atlas includes 3384 maps and over 13,039 new county records.


The county records reported by Steyermark (1963) are shown in solid dots (●).  Subsequent reports of new county records are shown in open circles (○).  The page number for each taxon in Steyermark's Flora of Missouri follows each name. New taxa for the state have the literature citation listed in parentheses after each name.  Because of the numerous reports of new records, it became impractical to indicate their sources on each map.  However, these sources are listed in Literature Cited and General References.  Taxa are listed alphabetically within families and families are also listed in alphabetic order.


The nomenclature of each taxon follows, with one or two exceptions, Yatskievych & Turner (1990) and Yatskievych (1999).  Each species, subspecies, variety and form is mapped separately.  In cases where the author chose to report the taxa only at the species level and infraspecific taxa exist, a separate map listing just the species has been prepared to accommodate these reports.  This was necessary in recording many of the taxa in Yatskievych (1999) where maps were prepared only at the specific level.  In a few taxa, maps are left blank because the literature sources did not indicate a county location.


Many names used in Steyermark (1963) have subsequently been placed in synonymy.  These synonyms are listed in brackets following each species name.  Most of these entries may be considered as acceptable synonyms.  However, a few were simply names misapplied by Steyermark and are indicated by the statement "sensu Steyermark, 1963".  For reference purposes only, excluded species are listed but not accompanied by a map.


The index at the end of this report lists accepted names in bold face type.


Dr. Weber had asked several people to aid in the proofreading of the maps.  We are not sure who all of these persons were or what parts they examined.  Rather than risk listing some but not all, we simply wish to acknowledge and thank them for their help.


Finally, Dr. Weber's untimely death made it necessary to complete this atlas without his valuable help.  Indeed, he had planned to complete, as one of the first tasks after his retirement, this atlas.  We are sure that one of his objectives would have been to include all new distribution records for Missouri that have appeared in the literature (Corcoran & Weber, 1991).  Consequently, this Atlas includes data from the Botanical Record 15 (1992), the new Steyermark's Flora of Missouri, Volume 1 by George Yatskievych (1999) and  reports published in Missouriensis and elsewhere. We thank Dr. George Yatskievych for his assistance in identifying the county localities for many taxa.


                                                                              William C. Corcoran

                                                                               Paul L. Redfearn, Jr.