192 



THE CACTACEAE. 



Berger remarks 



even into varieties. 



Opimiia megalarthra Rose (Smiths. Misc 



1908), in its very spiny joints, 



small fruits, seems very different from the common c 



greenhouse for several years it takes on much 



O. robusta. 



form 



Opuniia cochinera Griffiths (Rep. Mo 



from 



Mexico, is, perhaps, a hybrid between Opuntia robusta and one of the Sireptacanthae 



Mex. Agr. E 



Monatsschr. Kakteenk 



Toum. Inter. Gard. Club 3: 14, the last two as Opuntia gorda; U. S. Dept 



PI. Ind. Bull. 74: pi. 5, as Tapuna pear. 



Mex. Asrr. E 



figure 4, represents a joint of the plant collected by Dr. Rose in Hidalg 



Mexico, in 1905, and described by him as Opuntia nn 

 trranh taken in Zacatecas. Mexico, bv Professor F. E 



from 



I 



■J 



Fig. 238. — Opuntia robusta. 



214. Opuntia guerrana Griffiths, Rep. Mo. Bot. Gard. 19: 266. 1908. 



I 



Plant 9 to 12 dm. high, with an open, branching top; joints oblong to orbicular, 15 to 25 cm. 

 long, thick, glaucous; areoles 5 mm. in diameter, filled with tawny wool; spines white to yellow, 

 I to 6, flattened, twisted; petals yellow; filaments greenish white; stigma-lobes green; fruit globose 

 greenish white, 4 to 5 cm. in diameter. 



Type locality: Near Dublan, Hidalgo, Mexico 



Known onlv from 



E 



Mexico 



very much Uke the common Opuntia 



215. Opuntia fusicaulis Griffiths, Rep. Mo. Bot. Gard. 19: 271. 1908. 



Plant 5 meters high or less, the branches erect or spreading; joints oblong, elongated, 4 dm 

 long or less, much longer than wide, glaucous, bluish green, spineless, narrowed at both ends; glo 

 chids often wanting; areoles small, filled with tawny wool; fruit greenish white. 



Type locality: Described from cultivated plants. 

 Distribution: Known only from cultivated specimens, 

 ///ws/rafiow; Rep. Mo. Bot. Gard. 19: pi. 23, in part. 



r 



. \ 



