BRITTON AND ROSE] OPUNTIOIDEAE OE NORTH AMERICA S°7 



Opuntia furiosa Wendl. Cat. Herrenh. 1835. 



Opuntia tunicate Link & Orro; Pfeiff. Enum. Cact. 170. 1837. 



Opuntia hystrix GrisEb. Cat. PL Cub. 117. 1866. 



Type locality : In Mexico, but at first supposed to have come from 

 Brazil. 



distribution : Northern Mexico, in the States of Coahuila and San 

 Luis Potosi; Cuba, apparently cultivated; Ecuador (see Schumann, 

 Monatsschr. Kakteenk. 8: 156) ; Chili (see Sohrens, op. cit. 10: 6). 



OPUNTIA PALLIDA Rose, sp. nov. 



Stems 5 cm. in diameter, about one meter high, with widely spread- 

 ing branches, the whole plant often broader than high; old areoles 

 very spiny, often bearing 20 spines or more, these often 3 to 4 cm. 

 long with white papery sheaths ; young areoles bearing few spines ; 

 ovary tubercled, the areoles either naked or bearing a few bristly 

 spines ; flowers pale rose-colored ; petals 1 5 mm. long. 



Type in U. S. National Herbarium, no. 451,783, collected by J. N. 

 Rose and Jos. H. Painter near Tula, Hidalgo, Mexico, July 3, 1905 

 (no. 8290). Additional specimens were collected by E. W. Nelson 

 at the same station, June, 1896 (no. 3879). 



This species grows interspersed with O. imbricata, but is much 

 lower in stature and has smaller leaves and lighter-colored flowers. 

 It is much more like O. tunicata, but that species has yellow flowers 

 and is always smaller. 



Illustration: Contr. Nat. Herb. 10: pi. 17. A. 



OPUNTIA IMBRICATA (Haw.) DC. 



Cereus imbricatus Haw. Rev. PI. Succ. 70. 1821. 

 Opuntia imbricata DC. Prod. 3: 471. 1828. 

 Opuntia rosea DC. Mem. Mus. Paris 17: 118. 1828. 

 Opuntia decipiens DC. Mem. Mus. Paris 17: 118. 1828. 

 Opuntia exuviata DC. Mem. Mus. Paris 17: 118. 1828, in part. 

 Opuntia stellata Saem-Dyck, Cact. Hort. Dyck. 50. 1842. 

 Opuntia cristata Salm-Dyck, Cact. Hort. Dyck. 50. 1842. 



Type locality : Unknown ; introduced into England by Loddiges in 

 1820. 

 Distribution : Central Mexico. 



OPUNTIA ARBORESCENS Engelm. 



Cactus cylindricus James, Cat. 182. 1825, not Haw. 



Cactus bleo Torr. Ann. Lye. N. Y. 2: 202. 1828, not H. B. K. 



Opuntia arborcscens Engelm. in Wisliz. Mem. North. Mex. 90. 1848. 



Type locality : No station given. 



Distribution : South Central United States and northern 'Mexico. 



