198 BOTANY. 
ContomiA LINEARISs, Nutt (Watson, J. c. p. 261)—Utah, Watson's 
Rep.; South Park, Colorado, July, 1873, Wolf (686, 687). 
Contom1a Gractiis, Dougl. (Watson, J. c. p. 262)—Denver, Colo., 
June, 1873, Wolf (354). : 
Contomra ciuio:pes, Benth. (Gilia divaricata, Nutt. Pl. Gamb. p. 4; 
Watson, J. ¢. p. 464).—Willow Spring, Arizona, July, 1874, Rothrock (233). 
Cottomia Cavanttiesiana, Don. (Gray, lL. c. p. 260; Watson, J. ¢. 
p. 465).—Big Dry Fork, Arizona, 1873, Loew (678); Camp Grant, at 
5,250 feet elevation, Rothrock (439); Chiricahua Mountains, August 1, 
1874, Rothrock (536); Black River, at 4,500 feet elevation, September, 
1874, Rothrock (788). | 
CoLLomia LongirLora, Gray (Proc. Am. Acad. 8, p. 261; Watson, 
l. c. p. 465)—San Francisco Mountains, Arizona, 1871, 1872, Watson’s 
Rep.; Denver, Colo., June, 1873, Wolf (675, 677) ; deserts of New Mexico, 
1873, Loew; Camp Bowie, Ariz., August, 1874, Rothrock (4:2); Deer 
Spring (180). 
-  CGottomia acereeata (Gilia aggregata, Spieng.; Watson, /. ¢. p. 269).— 
Arizona, Nevada, and Utah, 1871, 1872, Watson’s Rep.; Arizona, 1873, 
Loew (305, 744); Blue River, Colorado, June, 1873, Wolf (745); Rocky 
Caron, Arizona, July, 1874, Rothrock (275) ; White Mountains, Arizona, at 
9,000 feet elevation, September, 1874, Rothrock (810)—An examination of 
a goodly number of specimens of Gulia aggregata, Spreng., from different sta- 
tions in the Rocky Mountains and California, brings to light a character in 
the species which has been overlooked,—the unequal insertion of the stamens, 
The degrees of variation in this respect are remarkable and so gradual as 
to rule out the supposition of dimorphism. In the extreme cases, they are 
included, on the one side, in the tube of the corolla and very unequally 
inserted at points wide apart, from the base upward, whilst, on the other, they 
are crowded toward the throat and more or less exserted. Then, the inser- 
tion sometimes is, or rather, perhaps, appears to be, equal. In a specimen of 
this kind from California, it would be hard to declare that the filaments in 
some of the flowers do not start out from the same horizontal line, whilst in 
other flowers on the same stalk their insertion is decidedly unequal. Now, as 
the main character which separates Collomia {rom Gilia is the unequal inser- 
