EVENING-PRIMROSE 
Pachyloplus hirsutus Rydberg 
When traveling along the highway toward the Roosevelt Dam 
in Arizona I saw a plant about eighteen inches tall growing from a 
ctevice in the rocks. It was full of buds as well as withered flowers, 
tising among masses of long green leaves. When the plant was lifted 
it was carried for several days awaiting an opportunity to sketch it. 
One evening on returning to the hotel for dinner, I noticed, on entet- 
ing the room, a delightful odor like that of a night-blooming cereus, 
and the plant was discovered in full bloom. The sketch fortunately 
was made that evening, by electric light, for the next mornin gall the 
flowets had withered. 
This species of evening-primrose ranges from Arizona and New 
Mexico to Wyoming. 
PLATE 388 
