WRIGHT PENTSTEMON 
Pentstemon wrightit Hooker 
By the side of the winding road leading up the dty slopes of Tum- 
amoc Hill to the Desert Laboratory of the Carnegie Institution, near 
Tucson, Arizona, I found great clumps of this beautiful pentstemon. 
The stems supporting the graceful flower panicles wete two and a 
half feet high. The lovely color of the blossoms was a delight to all 
who passed. The plants grew out of the disintegrated tock of the 
mountain and subsisted with so little soil that it seemed all but im- 
possible for them to flourish in such perfection in so arid a spot. 
The pentstemons ate named from the fact that in addition to their 
four normal stamens, they have a fifth sterile stamen which often is 
conspicuous because it is covered with haits, and often extends well 
up toward the mouth of the corolla. The pentstemons belong to the 
Figwort Family. 
PLATE 386 
