iU 



Th^ cacYac^ai^. 



128. Opuntia sulphurea G. Don in Loudon, Hort. Brit. 196. 1830. 



Opuntia maculacantha Forster, Handb. Gartenz. 17: 166. 1861. 

 Opuntia pampeana Spcgazzini, Contr. Fl. Ventana 30. 1896. 

 OpU7itia vulpina Weber, Diet. Hort. Bois 895. 1898. 



m 



Plants low and spreading, forming broad clumps i to 2 meters in diameter, 3 dm. high or less; 

 joints flattened, oblong to obovate, 12 to 25 cm. long, thick, strongly tuberculate, usually green 

 but sometimes purplish; terminal joints easily detached; leaves conic, about 2 mm. long; spines 2 to 

 8, generally straight but sometimes curved and twisted, spreading, 3 to 10 cm. long, brownish to 

 red, but sometimes quite pale at first; flowers about 4 cm. long, yellow; fruit with a deep umbilicus, 

 short, about i cm. long. 



Typ 



from 



occurring in Bolivia. 



This species was not seen in Chile by Dr. Rose, and we are doubtful in considering the 



specimens 



Icctcd at La Paz (No. 18860), while thick, are not conspicuously tuberculate; the spines are 



somewhat 



1 he name 

 synonym < 



from 



from specimens from 



Schumann 



Mexico 



ment. Dr. Weber, with whom we are in agreement, refers the species to O. sulphurea. It 

 is the only species we know with such large tubercles on the joints. 



laevioTy major, minor, and pallidior. 



some 



Here probably belongs Opuntia sericea G. Don (Salm-Dyck, Hort. Dyck. 363. 1834), 



Jh 



\ 



from Chile, but doubtless from 



(I^oudon 



Hort. Brit. 196. 1 830) is the same. There are several varieties of 0. sericea which we would 

 put with it: longispina Salm-Dyck (Hort. Dyck. 363. 1834); coerulea Forbes (Hort. Tour 

 Germ. 159. 1837) which is probably 0. coerulea GiWies (Pfeiffer, Hnum. Cact. 155. 1837); 

 maelenii Salm-Dyck (Cact. Hort. Dyck. 1844. 46. 1845) which is O. maelenii (Salm-Dyck, 

 Cact. Hort. Dyck. 1844. 46. 1845). Opuntia tweediei (Schumann, Gesamtb. Kakteen 745. 

 1898) is given as a synonym of this species by Schumann. Opuntia albisetosa Hildmann, 

 a name only, belongs here according to Hirscht (Monatsschr. Kakteenk. 10: 48. 1900). 



Illustrations: Bluhende Kakteen 3: pi. 136; Monatsschr. Kakteenk. 8:121; Schumann, 

 Gesamtb. Kakteen f. 106, all as Opuntia maculacantha. 



Plate XXIII, figure 2, represents a flowering joint of the plant collected by Dr. Rose 

 near Cordoba, Argentina, in 19 1 5. 



129. Opuntia soehrensii sp. nov. 



Prostrate, in masses usually i meter In diameter or less ; joints at first erect or ascending, finally 

 prostrate and rootmg and forming new colonies, flattened, rather thin, somewhat tuberculate, very 

 spmy orbicular, 4 to 6 cm. m diameter, often purplish; spines slender, rather variable in color, 

 usually yellow or brown, several from each areole, sometimes as many as eight, the longest ones 

 5 cm. long, erect; flowers light yellow, 3 cm. long; sepals brown; filaments yellow; style white; 

 stigma-lobes green; fruit naked, 3 cm. long; seeds 3 to 3.5 mm. broad, ovate, thickish, with narrow 

 margin and roughened sides. 



lolivia, and northern Argentina. Type collected by Dr. 



^ 



Highlands of southern Peru, ] 

 Mrs. J. N. Rose below Pampa 



very common m its region, but as it is cultivated somewhat 



determine 



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