RESULTS 



The total number of state species of special concern known from the 

 Sioux District doubled as a result of this study, and the total 

 number of known populations multiplied. Eight species (26 

 populations) were documented in Montana, and five species (11 

 populations) were documented in South Dakota representing a total 

 of thirty-seven new populations of thirteen plant state species of 

 special concern. Two target species were not found, and may be 

 extirpated from the original collection sites. Incidental 

 information was compiled on three other species from the District 

 which were not found. All 18 target species known on the District 

 are depicted in Figure 2, and presented along with resulting rank 

 recommendations in Table 2 for Montana and in Table 3 for South 

 Dakota. Included among the former are two native species not 

 previously known in the Montana flora, which are automatically 

 added to the Montana state list of species of concern. 



Over 300 species of vascular plants were identified in both the 

 Montana and South Dakota study area units (Appendix F. Preliminary 

 vascular flora) , in addition to the taxa recorded in Booth and 

 Wright (1966) and Visher (1914) . Included among these are many 

 target species which were found outside of the state in which they 

 are being tracked but which nonetheless provide search and status 

 information (Appendix G) . The paucity of botanical investigations 

 is believed to account for the apparent rarity of many species at 

 the three-state intersection of Montana, South Dakota and North 

 Dakota. 



The remainder of this section is devoted to status information 

 compiled on each of the 18 target species. Descriptions of the 

 taxa are given to augment floras (Dorn 1984, Van Bruggen 1985, 

 Great Plains Flora Association 1986) . Information content 

 includes: 



A. Description 



B. Present status 



C. Geographic distribution 



D. Habitat 



E. Population biology and biological interactions 



F. Overall assessment and management recommendations 



Study area information is emphasized in these abbreviated status 

 reports. A map of each species' Great Plains distribution is 

 reproduced from the Great Plains Flora Association (1977) . 



Illustrations of each species are included with the text as 

 available, and color xeroxes from slides are presented in Appendix 

 E, including photographs of the plant close-up and its habitat. 

 Species description text includes strictly metric units for the 

 technical description, but both metric and English for general 

 description and diagnostic characters. 



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