8. Ikkno 37 



Text-fig. 1 A). Cntkin, fithrr nmie <»r ftnmlo. (i<'nH4|y oovmKi with long 

 gray hairs (Plat** I, fig. 1 </••—? ). Stigma ^wvu. 



Fi plant. St^in ami hranrhfs spn^nding. I><uvtM glahnmH dti Imth 

 8iirfact»8, cither with or withnut stiptiirs. Catkin, mostly dmHily hairy 

 as in the one p»»ront (Plato i. fig. .*{ ^f J ). or s|Minngly ho jls in tho 

 other (Plate I, fig. 4 c/" — J ). acronling to individuals. Stigma Hcarlot- 

 colourcd. 



Below I will compare with each other the characters above enumer- 

 ated in the P-, F^- and i^^-generations respectively. 



(a) Habit of Stem. 



S. multinervis has an erect stem with its branches directed upwanls, 

 as is usual in many trees, while in S. gracili.sti/hi tin- stem ramifies noar 

 to the base into many slender branches, which are directed horizontally, 

 and oflen lie ujxjn the gi-ound. This fact causes a great dit!"erence in 

 the habit of the two species: the former is erect and high, whih* the 

 latter is low ; but as in the latter the branches spread horizontally in 

 all directions it comes to occupy a uiuch larger spact- of ground than 



