OF ARTS AND SCIENCES. 353 



Prunus Mexicana. Young branches, pedicels and petioles can- 

 escent with a short dense subtomentose pubescence : leaves deciduous, 

 oblong-lanceolate or lanceolate, acuminate, rounded at base, acutely 

 toothed, pubescent and lighter-colored beneath, puberulent above, 2 or 

 3 inches long : pedicels short, fascicled : fruit compressed-ovate, the 

 very thick turgid stone 7 or 8 lines long, rounded on the margins, 

 acutish. — At Lerios, Coahuila (2130). 



Spir^a discolor, Pursh, var. dumosa, AYatson. In the San 

 Rafael Mountains (104 Schaffner) ; 223 Parry & Palmer. 



Yauquelixia cortmbosa, Corr. In the Sierra Madre south of 

 Saltillo (329). 



LiNDLEYA MESPILOIDES, HBK. In the same region (324). 



RcBUS TRiYiALis, Michx. {R. hiimistrcftus, Steud.) In the moun- 

 tains about Sau Luis Potosi (105 Schaffner), the stem described as 20 

 to 30 feet long ; 224 Parry & Palmer. The species is very variable 

 in the amount of pubescence. 



Cercocarpus parvifolius, Nutt. At Lerios, Coahuila (174). 

 Also var. paucidentatus, with the small leaves entire or sparingly 

 toothed at the summit, often densely pubescent ; in shady places near 

 San Miguelito (114 Schaffner). This is the same as 224 Parry 

 & Palmer, and 1056 Wright. The typical form has occasionally a 

 similar pubescence. 



CowANiA PLiCATA, Don. In the Sierra Madre south of Saltillo 

 (325) ; 226 Parry & Palmer. 



CowANiA Mexicana, Don. At Guanajuato (Duges). 



Fragaria Mexicana, Schlecht. At Lerios, Coahuila (326). 



PoTENTiLLA HEPTAPHYLLA, Mill. In the Caracol Mountains, 

 Coahuila (327). 



PoTENTiLLA NoRVEGiCA, Linn. At San Lorenzo de Laguna, 

 Coahuila (328) ; a form with the leaflets frequently divided. 



Alchemilla siBBALDiiEFOLiA, 11 BK. In the Morales Mountains 

 (868 Schaffner) ; 227 Parry & Palmer. 



Alchemilla hirsuta, HBK., var. alpestris, Schlecht. Villous 

 with long scattered and spreading silky hairs, the leaves alike on both 

 sides, and the calyx wholly glabrous. In the San Miguelito Moun- 

 tains (869 Schaffner). This variety, and the more typical form (var. 

 campestris, Schlecht., having the hairs appressed and more numerous, 

 especially on the under side of the leaves, on the stem and calyx), have 

 been distributed together under 721 Parry & Palmer, 71 Coulter 

 (referred to A. tripartita)^ and 82 Ghiesbreght. 308^ Bourgeau, also 

 referred to A. tripartita, is the present variety. The lobes of the 



VOL. XVII. (n. 8. IX.) 23 



