NO. 2 gentry: land plants 149 



Known only from San Pedro Nolasco Island where it commonly 

 grows in close association with Mamjnillaria jnultidigitata. Lindsay 

 (I.e.) has written that "its large golden clumps [contrast] pleasantly 

 with the white masses of the latter." 



Ferocactus acanthodes (Lem.) Brit. & Rose, Cactaceae 3:129. 

 1922. 



North of Point Lobos, Sonora, I\Iarch 26, Rempel 287 (sterile). 



This is the common Ferocactus or bisnaga on the arid slopes and 

 mesas in the northern part of the gulf region ; type locality, "California." 



Ferocactus Covillei Brit, k Rose, Cactaceae 3:133. 1922. 



Guaymas, Sonora, January 23, Dawson 1009 (in part). 



From southern Arizona to southern Sonora; the type from near 

 Altar, northern Sonora. Guaymas is near the southern limit of the 

 species. 



Ferocactus Townsendianus Brit. & Rose, Cactaceae 3 :127. 1922. 



Frailes Bay, April 4, Rempel 318, hillside. 



A poorly known species from the southern part of the peninsula and 

 adjacent islands; the type from Isla San Jose. Continuation of this name 

 is questionable, since it appears applicable to the species described earlier 

 by Weber as Echinocactus peninsulae, Bull. Mus. Nat. Paris 1 :320. 

 1895. Britton and Rose failed to resolve the question, apparently be- 

 cause they did not have access to Weber's material collected by Leon 

 Diguet in 1894 near Santa Rosalia, and based their concepts of the 

 species on a fragmentary collection of Gabb. This they state to be with- 

 out radial spines, the main character segregating F. Townsendianus from 

 F. peninsulae (Weber) Brit. & Rose, Cactaceae 3 :133. 1922, but Weber 



describes "Aiguillons rougeatres, a pointe jaune; exterieurs 11, ." 



Taxonomically the question can be cleared by field work and ample 

 herbarium material, and more solidly by access to Diguet's original notes 

 and photos. Britton and Rose's name is retained here solely because it is 

 the one in common use for the southern peninsular plexus. 



Ferocactus sp. 



Tetas de Cabra near Guaymas, Sonora, January 23, Dawson 1009a. 



Referred here is a specimen strongly suggestive of Ferocactus ala- 

 mosanus platygonus G. Lindsay, Cact. Succ. Jour. 14:139. 1942, but 

 differing materially in the strongly ascending 7-8 lateral spines and as 

 reported by the collector in the large size; up to 1.5 m. This is the plant 



