I . INTRODUCTION 



This report represents an addendum to the status review of 

 Howell ia aquatilis . a sensitive plant species that occurs on the 

 Flathead National Forest (Shelly 1988) . Additional field surveys 

 were conducted during the summer of 1988, in areas on the 

 Flathead National Forest that had not previously been studied. 

 These areas included ponds and wetlands in or adjacent to the 

 Elk, Glacier, and Kraft creek drainages (Missoula County) . Also, 

 surveys were conducted in the vicinity of Salmon Prairie (Lake 

 County) . Sixty-seven sites that had not been previously 

 inventoried were surveyed; of these, three were found to contain 

 previously undocumented populations of ti* a quatilis . This 

 addendum includes maps of the locations of all areas surveyed in 

 1988, and maps and element occurrence print-outs for the three 

 newly discovered populations. 



Additionally, monitoring studies were established for five 

 populations (two in the Condon Creek area, and three in the Lost 

 Creek-Cilly Creek area) . These studies consist of transects 

 along which line-intercept data were collected for H. aquatilis 

 and the dominant associated species. The data have been used to 

 estimate the percent cover of these species within the habitats. 

 This addendum includes the initial results, and a preliminary 

 assessment of the suitability of this technique for monitoring 

 population trends and response to management activities. 



II. SPECIES INFORMATION 



A. REVIEW OF PRESENT STATUS 



1. FEDERAL STATUS: A rangewide status report on il. 

 aquatilis has been prepared for the U.S. Fish and 

 Wildlife Service (Shelly and Moseley 1988). On 

 the basis of information obtained from all five 

 states in which H. aquatilis is historically (OR, 

 CA) or currently (ID, MT, WA) known to occur, and 

 an assessment of Icnown and potential threats to 

 populations, the species was recommended for 

 inclusion in Category 1 of the U.S. Fish and 

 Wildlife Service Notice of Review. Category 1 

 taxa are those "...for which the Service currently 

 has on file substantial information on biological 

 vulnerability and threat (s) to support the 

 appropriateness of proposing to list them as 

 endangered or threatened species. Presently, data 

 are being gathered concerning precise habitat 

 needs and, for some of the taxa, concerning the 

 precise boundaries for critical habitat 

 designations. Development and publication of 

 proposed rules on these taxa are anticipated..." 

 As of the preparation of this addendum, the U.S. 



