179 



Atriplex canescens (Pursh) Nult. White Rocks, July, 1918, 

 with galls of Asphondylia neomexicana Ckll. The White Rocks 

 locality, northeast of Boulder, was botanically discovered by 

 Mr. D. M. Andrews, who kindly took me over the ground. 

 It is the type locality of Asplenium andrewsii Nels., which we 

 saw growing on the face of the cliff. The White Rocks con- 

 sist of Laramie sandstone, outcropping for a considerable dis- 

 tance along the creek, and possessing a flora which is, on the 

 whole, very distinct from that of the surrounding country or 

 the foothills. The fauna also doubtless diflfers. In my short 

 visit I caught a southern bee, Sphecodogastra texana (Cresson) 

 the genus and species new to Boulder County. The rocks are 

 gay with Helianthus petiolaris Nutt. in July, and there is an 

 abundance of Prunushesseyi Bailey with fine fruits.* Among 

 the additions to the local flora discovered here by Mr. Andrews 

 are Abronia {Tripterocalyx) micrantha Gray and Rtimex 

 venosus Pursh. 



Another limited locality with a special flora is about four 

 miles north of Boulder, on the road to Lyons, where the 

 Niobrara shale outcrops. Here the specially characteristic 

 plant, new to the local list, is Delphinium geyeri Greene. 

 Here also is a quantity of Hedysarum pahulare Nels., also new 

 to the list. These two very different and locally unique 

 stations would well repay intensive study, which should if 

 possible include the animals as well as the plants. 



Agiiilegia saximo7itana Rydb. has been found by Mr. Andrews 

 above Silver Lake. 



Camelina microcarpa Andrz. The weed now common in Boulder 

 is not C. sativa, as reported, but C. microcarpa. Dr. Rydberg, 

 to whom a specimen was sent, agrees. Bonnier treats micro- 

 carpa as a subspecies of sativa. 



Rosa pratincola angustiarum Ckll. Mr. Andrews found this on 

 Wood Mountain, Sept, 3, 1914, and I noted that the fruits 



*Mr D. M. Andrews has visited the exact locahty of Prunus prunella Daniels, 

 and finds the plants as described, but they are P. besseyi. W. F. Wight (Native 

 American species of Prunus, p. 69) states that P. prunella is a form of besseyi with 

 well marked leaf serrations. Rydberg, however, admits P. prunella, and places it in 

 a different section from P. besseyi. 



