1904.] NATURAL SCIENCES OF PHILADELPHIA. 115 



acters of this rose result directly from its surroundings is perhaps an 

 open question. If it could be transferred to a dry sunny place the 

 result might be something not very different from aciculata; but this 

 is mere guessing. The type locahty of sayi is somewhere near the 

 British boundary. 



(8) R. engelmanni S. Wats. 



Rehder gives this and sayi both as varieties of R. acicularis Lindley, 

 but this seems imreasonable. I have foimd R. engelmanni abundantly 

 near the Halfway House on Pike's Peak, Colorado, and it seems very 

 distinct by its greatly elongated fruit. 



(9) R. pratincola Greene. 



The prairie species, formerly confused with arkansana. It is only 

 one or two feet high, and has 7 to 11 leaflets. The stipviles are only 

 softly pubescent. 



(10) R. suifulta Greene. 



A low form of open gromid, described from Las Vegas, New Mexico, 

 where I have collected it. I found it many years ago at Ula, Colorado, 

 and described it in MS. as a new variety of R. arkansana, but the de- 

 scription was not published. My specimen is at Kew, The flowers 

 are quite large, 66 mm. across, the petals pale, and often inclined to be 

 streaked. 



(11) R. manca Greene. 



W, Mancos Cafion, S. Colorado, at 10,000 feet. Another of the small 

 species, about a foot high. The recurved prickles, small flowers, very 

 narrow stipules, etc., distinguish it. 



(12) R. macounii Greene. 



Assiniboia to Cheyenne, Wyoming. A low shrub of dry elevated 

 plains ; leaves wholly glandless, leaflets mostly 9 or 11 ; flowers solitary, 

 small and rather pale ; fruits depressed-globose. 



(13) R. woodsii Lindley. 



A northern species, apparently not found in New Mexico. Accord- 

 ing to Watson, it is distinguished by the presence of infrastipular spines 

 and laterally lobed outer sepals, and is usually a low bush, not over 

 three feet high. Rydberg {Flora of Montana) states that the R. fendleri 

 of Watson and Coulter is the true R. woodsii, and remarks that the 

 character of lobed sepals is inconstant, and that in Lindley's original 

 description they are said to be entire. The fruit is small and red, and 

 the leaves are nearly glabrate, and according to E. Nelson shiny, 

 those of R. fendleri being dull. Rehder in his table says the sepals of 

 R. pisocarpa and fendleri are quite entire, while those of woodsii are 



