NOTES ON CACTE.E. 121 



doubt belong Ccrciis calvus & C. titan, Engelm, in Coult. 1. c. 409; 

 the specimens of Gabb ai'e such scraps that it may never be known 

 with certainty to which. They probably both belong to C. Pringlei, 

 certainly both do as to fruit. The woolly groove connecting the 

 areolse is not constant in these plants. It is present or absent in 

 various parts of the same rib. Of course the trunks of all the 

 giant species are more or less "bald" in age. 



Opuntia Tuna (L.) is about the old missions and cultivated 

 everywhere on the peninsula. 



Opuntia Engelmanni var. littoralis Engelm. Bot. Cal. i, 248. 

 Northern part of the peninsula, along or near the const. 



Opuntia pycnantha Engelm. in Coult. 1. c. 423. Type Agas- 

 siz' specimen in Herb. Mo. Bot. Garden, but the "good joint, flower 

 and ripe fruit" are in the herbarium of Mr. Brandegee. 



Opuntia pycnantha margaritacea Coult. 1. c. 424. These 

 two plants have been brought to San Diego in living specimens by 

 Captain Porter, 



Opuntia angustata Comonduensis Coult. iii, 425, described as 

 having "joints semi-obovate (one side straight as if an obovate joint 

 had been divided in the median line), states what actually occui-red. 

 Mr. Brandegee, in making specimens of the larger Platopuntias splits 

 the joint and then divides it longitudinally down the center. Of 

 course the plant has nothing to do with 0. angustata, the reference 

 having been made on account of the supposed shape of the joint. 



Opuntia tapona Engelm. in Coult. 1. c. 423. This and the 

 above are the common Platopuntice of the southern part of the 

 peninsula; both are growing in our garden. The type of the last 

 species is less than an inch square. 



Opuntia invicta Brandg. is the stoutest of the clavaice, the 

 joints, well developed, attain a circumference of 3 dm. It has 

 flowered and fruited abundantly this year in San Diego. There is 

 no ground whatever for the suspicion that it might be a species of 

 Cereus. Its flowers and fruit are exactly Opuntia.* 



■^Opuntia Bradtiana (Coult.) Cereus Bradtianus Conlt. 1. c. 406, is per- 

 haps the nearest relative of O. invicta. In both sjjecies the tubercles are 

 more or less confluent into vertical ridges. In O. Bradtiann they are 

 almost completely so. The spines are, however, barbed and the young 

 joints are covered with conspicuous subulate leaves, so that there can be 

 no doubt that it belongs to Optnnia, although I have not seen fruit or 

 flower. 



