88 SUPPLEMENT. 



[iii. p. 170.] 20. QuercUS crassifolia, Humb. et Bonpl. ; S. Wats, in Proc. Am. 

 Acad, xviii. p. 156. 



North Mexico, in the San Miguelito Mountains, San Luis Potosi (Schaffner, 897), 

 region of San Luis Potosi (Parry & Palmer, 836). 



[iii. p. 172.] 41*. QuerCUS grisea, Liebm. Egesl. p. 13 ; DC. Prodr. xvi. 2, 

 p. 35 ; S. Wats, in Proc. Am. Acad, xviii. p. 156. 



New Mexico. — North Mexico, in the Sierra Madre south of Saltillo (Palmer, 1278). 



SALICINE.E. 



[iii. p. 181.] 2*. Populus fremontii, S. Wats., varJ wislizenii, S. Wats, in 



Proc. Am. Acad, xviii. p. 157. 



North Mexico, region of San Luis Potosi (Schaffner, 891 ; Parry & Palmer, 843). 



GNETACE^E. 



[iii. p. 182.] 1*. Ephedra aspera, Engelm. MS. ; S. Wats, in Proc. Am. Acad, 

 xviii. p. 157. 

 Ephedra, sp. (4). 



North Mexico, in the Sierra Madre south of Saltillo, Coahuila (Palmer, 1288), west 

 of Cartamullo (Gregg). 



[iii. p. 182.] 1**. Ephedra pedimculata, Engelm. MS. ; S. Wats, in Proc. 

 Am. Acad, xviii. p. 157. 

 Ephedra, sp. (2). 



Texas. — North Mexico, Saltillo and Juraz, Coahuila (Palmer, 1289, 1290), region 

 of San Luis Potosi (Parry & Palmer, 855 ; Schaffner). 



CONIFEILE. 



[iii. p. 183.] CupreSSUS arizonica, Greene ; S. Wats, in Proc. Am. Acad, xviii. 

 p. 157. 



Arizona. — North Mexico, in the Sierra Madre south of Saltillo (Palmer, 1293). 



With regard to some of the other Cupressinece collected by Parry and Palmer, Watson 

 appears to have had different plants under some of the numbers from those in the Kew 

 set, for his determinations do not agree with ours, even where we had type specimens 

 before us. 



[iii. p. 187.] 11*. PillUS latisquama, Engelm. ; S. Wats, in Proc. Am. Acad, 

 xviii. p. 158. 



Through some confusion of specimens, the foliage of Pinus ayacahuite was figured 

 for this species in the ' Gardener's Chronicle,' where it was first published. 



