HYBRIDISING AND CROSS-BREEDING. 135 



Fourth Degree. The flower is fertilised by pollen from the 

 same species, but taken from a separate individual. 



Fifth Degree. The female flower is fecundated by a male 

 flower taken from the same branch or off the same inflor- 

 escence. 



Sixth Degree. The female flower is fertilised by a male 

 flower taken from a different inflorescence borne by the same 

 plant. 



Seventh Degree. The female flower is fertilised by the 

 pollen of a male flower of the same species, but from another 

 individual. 



Eighth Degree. The flower hermaphrodite or unisexual is 

 fecundated with pollen of another variety of the same species. 



Ninth Degree. The flower hermaphrodite or unisexual is 

 fertilised by pollen of a distinct species. 



Tenth Degree. The flower unisexual or hermaphrodite of 

 an hybrid is fecundated with pollen of another hybrid variety. 



To the foregoing we may add the following : 



Eleventh Degree. The flower unisexual or hermaphrodite 

 of a species in its pure state is fertilised with pollen from a 

 cultural variety of the same species, or vice versa. 



Twelfth Degree. The flower hermaphrodite or unisexual of 

 a pure species is fertilised with pollen from a hybrid variety 

 of another species, or vice versa. 



Thirteenth Degree. The flower of a pure species is fertilised 

 with pollen from a species belonging to an allied genus. 



Fourteenth Degree. The flower of a monoecious or dioecious 

 plant is fertilised by pollen from the hermaphrodite flowers of 

 an allied genus or species, and vice versa. 



If careful records were kept of all hybrids between evergreen 

 and deciduous, bulbous and fibrous-rooted, erect-growing and 

 scandent-habited plants, or poisonous and edible or innocuous 

 plants, much useful information would be obtained. As will 

 have been observed by the foregoing remarks, there are several 

 ways in which new forms of plant-life may be originated, or 

 old forms modified, and for the sake of convenience these 

 may be here tabulated together as follows : 



Bigeners or Bigeneric Hybrids* These plants are obtained 



* Among bigeneric hybrids, Mr Weddell has indicated the following 

 (See Ann. des Sc. Nat., 3d ser., vol. xviii. , 1852) : Lychnis and Saponaria , 

 Ervum and Vicia, Lychnis and Cucubalus, Ipomtza and Convolvulus* 

 Nicotiana and Datura, Papaver and Chelidonium, Papaver and Glaucium^ 

 Lanateria and Hibiscus, Aceras and Orchis ; and to these may be added, 

 Philesia and Lapageria, Phaius and Calanthe, Libonia and Sericographis t 

 Calanthe and Limatodes. 



