198 BOTANY. 



Collomia linearis, Nutt (Watson, I. c. p. 261).— Utah, Watson's 

 Rep.; South Park, Colorado, July, 1873, Wolf (686, 687). 



Collomia gracilis, Dougl. (Watson, I. c. p. 262).— Denver, Colo., 

 June, 1873, Wolf (354). 



Collomia gilioides, Benth. (Gilia divaricata, Nutt PI. Gamb. p. 4; 

 Watson, I. c. p. 464).— Willow Spring, Arizona, July, 1874, Rothrock (233). 



Collomia Cavanillesiana, Don. (Cray, I. c. p. 260; Watson, I. c. 

 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 longiploka, Gray (Proc. Am. Acad. 8, p. 261 ; Watson, 

 I. 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 (472); Deer 

 Spring (180). 



Collomia aggregata (Gilia aggregata, Spieng. ; Watson, I. c. p. 269).— 

 Arizona, Nevada, and Utah, 1871, 1872, Watson's Rep.; Arizona, 1873, 

 Loew (305, 744); Blue River, Colorado, June, 1873, Wolf (745); Rocky 

 Canon, 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 Gilia 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 from Gilia is the unequal inser- 



