264 THE NURSERY-MANUAL 



cactus and echinocereus, a different method is preferable. The 

 head of the plant is cut away with a perfectly smooth transverse 

 cut. A stock is chosen that has about the same diameter as the 

 cion, and it is given a smooth transverse cut. The two flat sur- 

 faces are then pressed firmly together and held in place by tying 

 them with a cotton or other soft cord. It is essential that 

 clean instruments be used to prevent inoculation with disease 

 germs. 



A number of the upright-growing species of cereus have been 

 used successfully for stocks, and there seems to be no limit to the 

 number of species that may be employed. When it is desired to 

 have the cion a foot or more high, good stocks may be obtained 

 from plants of the old genus Cereus, as Lemaireocereus stellatus, 

 Nyctocereus serpentinus, and other species of similar habit. These 

 stocks are preferable for use in grafting Aporocactus flagelliformis 

 and species of epiphyllum and rhipsalis, which normally grow in a 

 pendent direction. When only short stocks are desired the above 

 may be used, and also C. tortuosus, C. Bonplandii, Selenicereus 

 nycticalus, S. MacDonaldice, and S. grandifiorus. These latter 

 plants are weak-stemmed when allowed to grow tall ; hence, they 

 cannot be used for high grafts unless supported by a stake of 

 some kind. All these species are readily grown from cuttings, 

 which should be somewhat longer than the stock is to be. When 

 the cutting is thoroughly rooted it should be potted and kept in 

 good growing condition until a new root system has formed. It will 

 then be ready to receive the cion after having been cut back to the 

 desired height. Condensed and adapted from C. H. Thompson, 

 Bull. 262, Bur. PI. Ind., U. S. Dept. Agr. 



Caesalpinia. Leguminosoe. 



Readily propagated by seeds which should be soaked in warm 

 water for some hours before sowing ; plant in a bed of sandy soil 

 and shade lightly ; pot off when the plants show the first true leaf. 

 Sometimes increased by cuttings, which may not root readily; 

 put them in sand under glass. 



Cajanus (Pigeon Pea). Leguminosos. 



Grown readily from seeds ; in the tropics treated as an annual 

 for its edible seeds. As a glasshouse subject, it may be grown from 

 cuttings struck in heat. 



