1904. 



NATURAL SCIENCES OF PHILADELPHIA. 



Ill 



Rosa arkansana Porter, R. prcetincia, n. sp. (or R. pecosensis, n. sp. (or 

 var. a. var.?). var.?). 



Petioles glabrous, with 

 numerous knobbed 



gland-hairs. 



Leaflets 7 on flowering 

 branches, 9 on new 

 shoots from base. 



Leaflets mostly smaller 

 and broader, e.g., 20 

 mm. long, 16 broad; 

 lateral leaflets almost 

 sessile, except on basal 

 shoots; midrib beneath 

 glabrous, with numer- 

 ous short red gland- 

 hairs ; serrations mi- 

 nutely serrulate, with 

 numerous small knob- 

 bed glands. 



Leaflets commonly only 

 5, often 7, often 5 + 

 an odd basal one. 



Leaflets unusually long 

 and narrow, e.g., 25 

 mm. long, 13 broad; 

 cuneate at base; resin- 

 dotted beneath, mid- 

 ribs witliout obvious 

 gland-hairs ; serrations 

 deep and simple, mar- 

 gin without gland- 

 hairs. 



Petioles minutely pubes- 

 cent, not glandular. 



Leaflets 7, sometimes 9, 

 sometimes 5, with an 

 odd basal leaflet mak- 

 ing 6. 



Leaflets mostly larger 

 and narrower in pro- 

 portion, e.g., 33 mm. 

 long, 20 broad; lateral 

 leaflets distinctly petio- 

 lulate; midrib beneath 

 lanulate with short 

 hairs, not glandular ; 

 serrations simple, 

 sharp, margin minutely 

 hairy, not glandular. 



All these plants have dull green foliage, not shiny, as Elias Nelson 

 describes R. woodsii. This also separates them from R. neomexicana 

 Ckll., of southern New Mexico, described in Entomological News, Febru- 

 ary, 1901, p. 41.^ This Rosa neomexicana is further distinguished by 

 the oblong fruits, which are small and scarlet, with persistent erect 

 sepals. It also has normally pairs of infrastipular spines, and mostly 

 solitary flowers. 



Rosa pecosensis is one of the most beautiful roses known to me. The 

 type was collected by my wife and Dr. Grabham, about six miles up the 

 cafion above the Kin Kale Ranch, June 1, 1903; but the j^lant is also 

 common down as far as the village of Pecos. When the flowers first 

 open the petals are depressed, so that they lie below the plane, the 

 surface of the flower becoming convex. A curious character observed 

 is the presence of a deep notch in one petal only, always an inner one. 

 The flowers vary in size down to about 42 mm. diameter, or occasion- 

 ally only 37 mm. 



If the three roses described above always held their characters, tliere 

 would be no hesitation about regarding them as distinct species. Speci- 

 mens occur, however, which vary in different wa3'S, and some of them 



^ The article containing this description was intended for Proc. Acad. Nat. Sci. 

 Phila., but was transferred to the News, for which it is altogether too botanical. 



