sepals; lower petals of the same color as the 

 sepals, orbicular, rather deeply bifid, h-h the 

 length of the blade; upper petals whitish and 

 blue-tipped, deeply to shallowly emarginate; 

 follicles (12-) 15-25 mm long, erect or very 

 slightly divaricate, usually glabrous but 

 occasionally slightly crisp-puberulent; seeds 1.5- 

 2 . 5 mm long, with prominent white-winged angles 

 (adapted from Hitchcock and Cronquist 1964, and 

 Ewan 1945) . 



3. LOCAL FIELD CHARACTERS: Delphinium andersoni i is 



usually distinguishable from all other Delphinium 

 species in the area by its thick, branching, woody 

 root system; flared sepals; glabrous, dissected 

 leaves; and whitish upper petals with blue tips 

 (Dorn 1984) . 



D. GEOGRAPHICAL DISTRIBUTION 



1. RANGE: Delphinium andersonii is a characteristic 

 plant of the desert valleys and ranges of the 

 Great Basin. It ranges from central and 

 southeastern Oregon east to central Montana, then 

 south to Utah, Nevada, and California, east of the 

 Sierra Nevada (Hitchcock and Cronquist 1964) . 



In Montana it is 

 at the northeastern 

 extent of its range 

 in Montana. It is 

 known from four 

 localities in three 

 counties: Carbon, 

 Jefferson, and 

 Lewis & Clark 

 (Figure 10) . 



2. CURRENT SITES: 



Delphinium andersonii was discovered on the Helena 

 National Forest north of Hogback Mountain by Peter 

 Lesica as part of this study. This location is 

 somewhat distant (ca. 70 miles north) from the 

 closest known Montana location. More detailed 

 population information on this species and its 

 location on a USGS 7.5' topographic map can be 

 found in Appendix 5. 



39 



