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340 BR. F. BUCHANAN WHTTE's 



16. Salix reticulata, L. 

 X Salix semireticulata, B. White 



X Salix sibyllina, B. White. 



C. STNANDE^E. 



10. Purpurea. 



17. Salix purpurea, L. 

 X Salix rubra, Huds. 

 X Salix sordida, Kern. 

 X Salix dichroa, Doll. 

 X Salix Doniana, Sm. 



It will be noticed that in this list one willow, generally included 

 in British catalogues, has been omitted. This is S. daphnoides, 

 Vill., which, though not unfrequently planted, can in no way be 

 claimed as an indigenous plant. 



It will also be noticed that in a very few cases only are varie- 

 ties distinguished by name. "Varieties," "forms," and "modi- 

 fications " of almost every species and hybrid have at one time 

 or other been described ; but since the forms so separated have, 

 iu the vast majority of cases, no constancy, but pass by imper- 

 ceptible gradations the one into the other, their retention is a 

 hindrance rather than a help. In the few instances where I have 

 distinguished varieties, these have not all quite an equal rank; 

 but their value will be indicated as each of them is specially 

 discussed. 



I may also state that 1 shall only occasionally allude to gynan- 

 drous forms, though in many cases names have been bestowed on 

 them. A number of species have not very unfrequently a mixture 

 of male and female flowers in the same catkin, whilst others have 

 their floral organs quite monstrous. Such forms, though of con- 

 siderable interest, ought not to be distinguished by name. 



III. Hybridization. 















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In addition to the really great variability of the true species 

 and consequent difficulty in attaining a satisfactory knowledge 

 of them, the fact that Willows hybridize with the greatest 



adds immeasurably 



The 



earlier saiicologists were mostly unwilling to recognize the pos- 



















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