12 



THE CACTACEAE. 



Distribution: Southeastern South America; widely planted in tropical America. 



( \-rcus fvrui'ianus toiluosus (Salm-Dyck, Cact. Hort. Dyck. 1844. 30. 1845) and 

 ( . I'i-niriiinus tortns (Salm-Dyck, Cact. Hort. Dyck. 1849. 46. 1850) are names only. 



( 'ereus peruvianus monstrosus is a common garden form first described as a variety 

 by De Candolle (Prodr. 3:464. 1828). It is similar to the typical form except that the 

 ribs are often broken into irregular tubercles or are unevenly sulcate. This has also been 



FIG. 12. A cultivated specimen of Cereus argentinensis. 



taken up as Cereus monstrosus (Steudel, Nom. ed. 2. 1:334. 1840). as Cereus monstrosus 

 minor (Monatsschr. Kakteenk. i: 163. 1891) and as C. monstruosus Schumann (Engler and 

 Prantl, Pflanzenfam. 3 6a : 178. 1894). It seems to be the same as Cactus abnormis Willde- 

 novv (Enum. PI. Suppl. 31. 1813).* Cereus pcntrianiis monstntosiis nanus is a somewhat 

 similar form mentioned by Schumann (Gesamtb. Kakteen 115. 1897) perhaps intended 



*Taken up later as Cereus abnormis by Sweet (Hort. Brit. 171. 1826). Another abnormal form is C. peruvianus 

 cristalus (Graebencr, Monatsschr. Kakteenk. n: 29. 1901). 



