22 



ORNAMENTAL CACTI. 



protection in the winter season, it is always desirable that they be 

 placed in the open during the summer months. They should be taken 

 out as soon as all danger from frost is past and left till danger from 

 frost threatens in the fall. The beds should be either high or on a 

 sloping surface, to insure thorough drainage about the plants. With 

 such plants it is better to leave them potted and plunge the pots into 

 the soil. (Pis. XIV and XV.) Plants thus exposed to the sunshine 

 and rain during the summer months will do far better than those kept 

 indoors and given house treatment. A judicious arranging of the 

 plants in such beds will have an attractive and pleasing effect. Where 

 a large number of individuals of a few species are available, some 

 artistic designs may be worked out in these summer beds. 



In the warmer southern or southwestern portions of our country a 

 very large number of cacti will thrive out of doors the year round. 

 In such localities the possibilities for bed planting have a much wider 

 range. More area may be given to them there than would be neces- 

 sary in the conservatories of the North. They will require greater 

 space, because plants that grow in the open thrive much better than 

 potted ones and consequently branch and spread over a greater area. 

 In such localities, with plenty of room, it is possible to produce 

 decidedly realistic landscape effects. Especially is this true in parks 

 (Pis. XVI and XVII) , where the semiarid character of the native home 

 of the cacti may be reproduced with wonderful accuracy. Winding 

 paths may be laid out through the tract and the borders planted in 

 irregular groups, so that the effect will change as one passes along any 

 of the w^alks. 



The following list contains the names of most of the cacti now in 

 cultivation in the United States. Many other forms are to be found 

 in collections but are not at all common. They are grouped with 

 reference to their habits of growth. Measurements, where given, refer 

 to mature plants and are only approximate. The list, arranged as 

 it is with reference to size, will serve as a guide to prospective pur- 

 chasers in dealing with collectors and traders. 



CULTIVATED FORMS OF CACTI. 



Columnar Forms of Cacti. 



Tall— over 6 feet in height. 



Cephalocereus: 



Cereus — Contd. 

 euphorbioides. 

 forbesii. 

 geometrizans. 

 giganteus. 

 hankeanus. 

 hildmannianus. 

 jamacaru. 

 macrogonus. 

 marginatus. 

 pecten-abori gi num , 



Cereus — Contd. 



Pilocereus— Contd. 



Cereus: 



chrysomalus. 

 senilis. 



azureus. 



baumannii. 



chiotilla. 



coerulescens. 



co'.umnaris. 



dumortieri. 



eburneus. 



peruvianus. 



pringlei. 



serpentinus. 



stellatus. 



thurberi. 



weberi. 



hoppenstedtii. 



houlletii. 



lanuginosus. 



polylophus. 



russelianus. 



cometes. 

 exerens. 

 fulviceps. 



Opuntia: 



cereiformis. 

 Pilocereus: 



chrysacanthus. 



schottii. 

 strictus. 



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