74 



THE CACTACEAE. 



character is not constant; flower differences are described, but these are inconstant. One 

 species, O. albiflora, has already been referred to synonymy. 



Opuntia salmiana is said to have come from Brazil, but no definite locality is given for 

 it, and it has not been collected there in recent times. If really from Brazil, and there is 

 no good reason to question this reference, it is doubtless from the southern part, possibly 

 on the border of Paraguay; indeed, 0. albiflora, one of the three, was described from a 

 Paraguay collection ; the other, 0. spegazzinii, is a native of the deserts of northern Argentina. 



Cactus salnriaiins Lemaire (Cact. 87. 1868, name only) has been referred here as a 

 synonym; as has also 0. floribunda Lemaire (Cact. Gen. Nov. Sp. 68. 1839). 



Opuntia schickendantzii Weber, included by Schumann in this relationship, we refer 

 to our series Aurantiacae. 



FIG. 88. Opuntia salmiana. 



FIG. 89. O. salmiana. Xo.6. 



Opuntia wagneri Weber in Gosselin (Bull. Mus. Hist. Nat. Paris 10: 393. 1904), de- 

 scribed without flower or fruit, is probably to be referred here; at least Roland-Gosselin 

 believed it to be of this group. We have not seen any of the specimens from Chaco, 

 Argentina, obtained by M. Emile Wagner in 1902. 



Illustrations: Bluhende Kakteen 3: pi. 123; Curtis's Bot. Mag. 76: pi. 4542; Fl. Serr. 7: 

 pi. 670; Jard. Fleur. 2: pi. 194; Loudon, Encycl. pi. ed. 3. f. 19406; Pfeiffer and Otto, Abbild. 

 Beschr. Cact. i: pi. 6; Castle, Cactaceous plants f. 15; Bluhende Kakteen 2: pi. 103, this 

 last as Opuntia spegazzinii: Hogg, Veg. King. 340. f. in. 



Figure 88 is from a plant in the greenhouses of the United States Department of Agri- 

 culture at Washington; figure 89 represents a joint of a plant collected by Dr. Rose at 

 Cordoba, Argentina, in 1915. 



