SUPPLEMENT TO THE FLORA OF MONTANA. 93 



Rydberg transposing this and 0. divaricata, Ntitt. and redescribing 

 the latter as Washingtonia intermedia, Rydberg, Flora, 289. The true 

 0. divaricata, Nutt. is rare in Montana. 



Osmorrhiza intermedia, (Rydberg) ; Washingtonia intermedia, Ryd- 

 berg, Flora, 289, is 6. divaricata, Nutt. 



Osmorrhiza Leibergii, (Coult. & Rose) ; Washingtonia Lcibergii, 

 Coult. & Rose, Cont. Nat. Herb. 7:66. Camp below Sperry Glacier, 

 6,000 ft., Sept. i, 1903. 



Osmorrhiza obtusa, Fernald ; Washingtonia obtusa, Coult. & Rose ; 

 W. divaricata, Rydberg, Flora, 290. Frequent in the state in low 

 shady places. 



Peucedanum circumdatum, Rydberg, Flora, 286, is P. montanum t 

 (Coult. & Rose). The true P. circumdatum, Wats, is found only west- 

 ward of our limits. 



Peucedanum Cous, Rydberg, Flora, 285, is P. montanum (Coult. 

 & Rose, Cont. Nat. Herb. 7:215), as to the Montana specimens. 



Peucedadum Cusickii, Wats. Beaverhead Co., near Dewey, 7,000 

 ft., near melting snow, June 24, 1902. Although the specimens are 

 without mature fruit and the flowers seem yellow on drying, the small 

 size,- finely dissected, glabrous leaves and glabrous stem will hardly 

 permit its being placed elsewhere. 



Peucedanum montanum, (Coult. & Rose) ; Lomatium montanum, 

 Coult. & Rose, Cont. Nat. Herb. 7:215; Peucedanum circumdatum, Ryd- 

 berg, Flora, 286; P. Cous, Rydberg, Flora, 285 in part. Common in 

 Jhe mountainous parts of the state. The acaulescent form is now 

 separated from the caulescent P. circumdatum, Wats., as P. montanum. 



Peucedanum orientale, (Coult. & Rose) ; Lomatium orientate, 

 Coult & Rose, Cont. Nat. Herb. 7 :22O. Custer Station, Apr. 24 and 

 May 3, 1890; Miles City, May 26, 1902. Dry uplands. 



Pterixia thapsoides, Nutt. ; Cymoptcrus tcrcbinthimts, Rydberg, 

 Flora, 292. Common on dry hillsides in the mountains, 3-5000 ft. 

 Difficult to distinguish from P. tcrebinthina. "Leaf-segments green- 

 er and not so rigid," can be said only of the species in flower, as 

 in mature fruit the leaves are quite as pale and rigid as in P. terebin- 

 thina, though the fruit is characteristic. 



Bozeman, May 14, 1900; Flathead-Brackett Cr. Divide, Aug. 18, 



