254 



Gates. 



In rubricalyx they are thicker, crinkled, darker green, and sessile or 

 anrate at base. But since all these characters change gradually in 

 passing up the stem, the determination of the position occupied by 

 any F., plant in comparison with its parents becomes a very complex 

 matter. I devoted much time to the study of these foliage characters, 

 and devised a system of recording them as regards (a) their broad or 

 narrow base, and (b) their smooth or crinkled surface. It would not 

 be expected that such characters would behave as imits, and in fact 

 every degree of both the characters crinkling and broad base is 



Fig. iS. Gyandiftora X rubricalyx. F._>. Foliage p — b . s. 



represented in F2 plants. I made use of the following symbols: p = 

 pointed base, b = broad base, s = smooth, c = crinkled, and fractions 

 of these for intermediate conditions. This method applied, for example, 

 to Cult. 49 gave 80 ps plants, /. e., plants with foliage rather closely 

 resembling grandiflora; only i be plant closely like rubricalyx; 3 bs 

 plants having leaves with rather broad bases and uncrinlded; and 

 4 pc plants having rather pointed leaves and considerable crinkling. 

 But it must not be supposed that any of these classes were uniform 

 among themselves, and the remaining 69 plants represented every 

 condition of intermediacy. These figures merely show that grandiflora 



