56 FLORA OF THE YELLOWSTONE NATIONAL PARK. 



Penstemon Menziesii, Hook. 



Rocky ridges and slides. Mt. Holmes, 9500 ft. alt,; Mt. Norris, 9700 

 ft. alt.; Yellowstone Lake (Adams). Not common. Corolla pink- 

 purple. 



Penstemon Menziesii, Dougl., var. Douglasii, Gray. 



Rocks along Slough Creek, 6500 ft. alt. Leaves from lanceolate to 

 linear lanceolate, l-2 inches long, sparsely serrulate. Corolla violet- 

 purple. Rare. 



Penstemon glaber, Pursh. 



Rather common on open dry slopes up to 7500 ft. alt. 



Penstemon glaber, Pursh., var. cyananthus, Gray. 

 Mammoth Hot Springs, 6500 ft. alt. 



Penstemon deustus, Dougl. 



Dry rocky soil, Junction Butte, 6200 ft. alt. Rare. 



Penstemon oonfertus, Dougl., var. caeruleo-purpureus, Gray. 



Common throughout up to 8500 ft. alt.; Upper East Fork, 10,300 ft. 

 alt. (alpine forms from 2-4 inches high). 



Penstemon gracilis, Nutt. 



Rocky places about Mammoth Hot Springs and Swan Lake, 5300- 

 7500 ft. alt. 



Mimulus nanus, Hook & Arn. 



Rather rare about the hot springs and geysers. Upper Geyser Basin, 

 7300 ft. alt.; Hot Springs (Parry); Crater Hills (Coulter). 



Mimulus rubellus, Gray. 



Swan Lake, 7400 ft. alt. ; Slough Creek, 6500 ft. alt. Flowers yellow 

 or rose color. 



Mimulus montioides, Gray in Suppl. Flor. N. A., 450. 

 With the preceding, but less common. 



Mimulus moschatus, Dougl. 



Mossy bogs and about springs. East Pelican Creek, 8200 ft. alt.; 

 Cache Creek, 7700 ft. alt. 



Mimulus Lewisii, Pursh. 



Bogs, mountain streams and wet subalpine slopes. Common aliove 

 8000 ft. alt. 



Mimulus luteus, L. 



Bogs and streams. Common up to 8000 ft. alt. 



