X PLANT-BREEDING 



Fig. Page. 



59. Burbank Sugar prune . . . . . . .181 



60. The improved stoneless prune. The pit is not surrounded 



by any stony material, but by a jelly .... 190 



61. HyVjrid Cactus Seedlings at Santa Rosa, 1904 . . .191 



62. The Spineless edible Cactus, a hybrid between wild spine- 



less species and the cultivated varieties, growing along 



the fence of Burbank's farm at Santa Rosa . . . 193 



63. A row of Shasta-daisies ...... 195 



64. A flower-head of the fluted variety of the Shasta-daisy . 198 



65. The crisp-leaved hyl^rid Heuchera . . . -197 



66. The crisp-leaved hybrid Heuchera of Burbank. B, C. 



Normal type of Heuchera leaves .... 201 



67. Extreme variability in the size of hybrid Callas . . 205 



68. A. The plum and B. The brown-leaved Prunus Pissardi, 



two species grafted on the same tree . . . -215 



69. Seedlings of the Spineless edible Cactus in their first and 



second years. Most of them are spiny, but the rare 

 spineless ones will be selected for propagation . . 227 



70. Seedlings of the Spineless edible Cactus in their second year. 229 



71. Extreme ' iriability in the shape of the leaves of hybrid pop- 



pies. Second generation from a cross between the Bride- 

 variety of the opium poppy and the Oriental poppy . 231 



72. A. The variety the Bride of the opium poppy. B. The 



wild species {Papaver pilosum) . C. The hybrid of these 



two poppies . . . . . . . .233 



73. Flowers of Columbine, showing the spurs . . . 241 



74. The deadly nightshade, or Atropa Belladonna. A. Brown 



flower, and B. Black fruit of the species. C. A twig of 



the yellow variety with pale flowers and yellow fruits . 243 



75. The long-leaved Veronica (Veronica longifolia) . . 245 



76. The laciniated bramble {Riibiis jruticosiis laciniatus), witli 



divided petals. B. A flower of the ordinary bramble . 249 



77. A. Ordinary celandine (Cliclidoiiiidn ma jus). B. Lac- 



iniated celandine (C. in. laciiiiatiim), which originated 

 from A in a garden at Heidelberg about 1590. a and b. 

 Flowers of A and B . . . . . .251 



78. Flowers of Evening Primroses, deprived of the petals. A. 



The ordinary species {Oen. biennis), a self-pollinating 

 species collected near Chicago. B. Summer-flower of 

 Lamarck's Evening Primrose, the stigma protruded be- 

 yond the anthers. C. A late flower of the same plant 

 with the anthers touching the stigma . . -252 



79. Panicles of oats. A. With erect and B. With spreading 



branches ........ 263 



80. Svalof Grenadier wheat, the best of the new Swedish varie- 



ties of wheat, very productive of grain and straw . . 266 



81. Svalof Bore-wheat, a new hardy variety for the cultures of 



2vliddle Sweden ....... 267 



