xii PLANT-BREEDING 



Fig. Page. 



97. Gordon's currant (Ribes Gordonianum), a hybrid of the 



flowering currant and the golden currant . . . 314 



98. A. The flowering currant of the Pacific coast (Ribes 



sangiiineiim). B. The yellow currant (Ribes aureum) . . 315 



99. A. The cultivated snapdragon. B-G. Its color varieties. 



B. Yellow. C. Delila, tube white and lips red. D, E. 

 Flesh-colored. F. Brilliant, of a fiery red. G. Album, 

 white with a yellow spot on the lip. H. The calyx and 

 the style after the removal of the corolla . . -317 



100. Danebrog Opium poppy ; petals red with a large white spot 



at the base ........ 319 



loi. Glass-covered part of the experiment garden at Amsterdam 

 in the late spring, 1906; the biennial plants of the Even- 

 ing Primroses are flowering, the annual specimens are 

 still very small. Tubes for spraying and sacks for arti- 

 ficial ])ollination . . . . . 323 



102. A. The short-styled Evening Primrose, and B-F, its parent 



form. b. A flower after the removal of part of its petals 

 and stamens, c. The same without petals, d. The 

 same without the tube and calyx, e. A flowerbud. 

 /. Ripe fruits. B-F. The corresponding parts of the 

 parent species, g. Styles, h. Longitudinal section of 

 ovary. /. Transversal section of base of style and calyx- 

 tube ......... 325 



103. A biennial specimen of the Evening Primrose of Lamarck . 327 



104. A. Spikes with almost ripe fruits of Oenothera gigas, a 



mutant species. B. The same of Oenothera Lamarc- 

 kiana, its parent form ...... 329 



105. A. A rosette of root-leaves of Lamarck's Evening Primrose 



in September. B. A similar rosette of one of its mutants 

 (Oen. sciniillans) in the same age .... 330 



106. The smooth-leaved variety of the Evening Primrose (Oeno- 



thera laevijolia), a. A side-flower with ovate instead of 

 ob.cordate petals, one of the new, highly variable charac- 

 ters of the new form ....... 331 



107. Oenothera muricata, a seaside plant which originated far 



from the sea . . . . . . . . 337 



108. Wulfenia carinthiaca, which grows almost only on the 



Giirtnerkugel in Carinthia ...... 339 



109. The smooth-leaved campion, a local plant of Bohemia with 



a useless character ....... 



no. Two Alpine species of milfoil. A. The Achillea atrata of 

 calcareous soils. B. The A. moschata of siliciferous 

 soils ......... 



111. Palo Verde or Parkinsonia microphylla, a typical desert 



plant from Tucson, Arizona ..... 346 



112. Palo Christi or Koeberlinia speciosa, a typical desert plant 



from Tucson, Arizona ...... 347 



341 

 343 



