ON HYBRIDISATION OF 80MK SPWJIKS 

 OF SALLW 



By S. IKKNO. F.M.L.S. 



(With Plate I and One Tcxt-H^nin'.) 



CONTKNTS. 



PA<»K 



Introduction 33 



I. Methods of Investigations 34 



II. Breeding Ex(>eriment8 3r» 



A. Results of the HybridiaatioHH done in 1910 M 



{a) Habit of Stem 37 



(6) Hairiness of Leaves 3h 



(c) Stipules 40 



(rf) Colour of Stigma 41 



(e) Character of Catkins 41 



B. llesults of the Hybridisations done in 1911 ... 51 



III. Conclusions o6 



Explanation of Plate I 57 



Table showing Successes and Failures of Hybridisations of Various 



Species of Salix 58 



Introduction. 



The well-known work of Max Wichura on the hybridisiition of 

 Salix- \fill ever remain the master-piece of investigations of such kind, 

 but as its publication dates back to more than fifty years ago, and as 

 since then no extensive researches on the hybrids of this genus have 

 ever been undertaken by any one, except some experiments made by 

 Kemer von Marilaun for comparing the date of first Howering of parents 



* Some of the results contained in this paper were published in /><-/. M<i<j. Tokyo, 

 Vol. XXX. 1916, pp. 316—320. 



2 Die Bastardbe/ruchtung im Pjianzenreich erViutert an den iJasturdcn der U'eiden. 

 Breslau, 1865. 



Joum. of Gen. viii 3 



