(375) 
Type locality: “In Mexico.” 
Distribution: Providence Mountains, southeastern California, 
eastward through southern Utah to western Texas, and south 
through northern Mexico. Lower Sonoran. 
pecimens examined: Providence Mountains, Cooper. 
6. COWANIA. 
1. Cowanta StanssuriAna Torr. Stansb. Exped. 386. pl. 3. 1852. 
Type locality: “Stansbury’s Island, Salt Lake.” 
Distribution: Utah and Nevada southward through Arizona 
and New Mexico. Lower Sonoran. C. mexicana Don, of central 
Mexico, has a shorter, almost campanulate calyx-tube 
Specimens examined: This has been collected by Brandegee i in 
the Providence Mountains, but I have not seen his specimens. 
Cowania mexicana dubia Brandegee (Zoe 5: 149. 1903) I 
have not seen. Its flowers are smaller than those of C. Stans- 
buriana and the styles are densely covered with short bristle-like 
hairs instead of plumose. 
7. CERCOCARPUS. Mountain MAHOGANY. 
Leaves narrowly lanceolate; margins entire, revolute. 1. C, ledifolius. 
alyx tomentose; its teeth broadly Seas 2. C. betulaefolius. 
Calyx glabrous; its teeth nearly subulate. 3. C. minutiflorus. 
Leaves oval to rounded, densely white downy beneath. 
4. C. Traskiae. 
1. CERCOCARPUS LEDIFOLIUS Nutt. in Torr. & Gray, Fl.N. Am. 1: 
Type locality: “Rocky Mountains, in alpine situation on the 
summits of the hills of Bear River of Timanagos, near the cele- 
brated ‘Lear Springs.” 
Distribution: Southwestern Washington and southern Idaho 
south to southern California and Arizona. Most frequent in the 
upper part of the Transition Zone, but sometimes extends to the 
edges of the Upper Sonoran. 
Specimens examined: Mount Pinos, Elmer 3974; Mount San 
Antonio, Abrams ro19, 2680; Mill Creek Falls, altitude 1800 
meters, Parish 5066; North Baldy, San Gabriel Mountains, 
