36 Russell— Comparison of the Structure of Hybrid 



In size it has been shown that the hybrids are generally inter- 

 mediate, though S. Moorei and S. areolata frequently incline 

 to show a characteristic increase in vigor over the parent types. 



In shape the intermediateness is particularly well shown in 

 the first hybrid, 5. Catesbaei (fig. 3), where the diverse shapes 

 and habits of the two parents are so neatly blended. The 

 parents of the other forms do not present so diverse an appear- 

 ance; but in small details, such as the shape of the mouth open- 

 ing, or the width of the fused laminae, the hybrid shows an 

 intermediate character. 



In all the blending of the parental lid shapes is shown. Where 

 a form with a frilled margin — as in 5. Drummondii or S. pur- 

 purea — is crossed with a form with a straight margin, the result- 

 ing hybrid has a lid with a frilled margin, but more loosely 

 wavy than in the parent. When a form like S. fiava, which 

 has a median tip process on the lid, is crossed with a blunt 

 tipped form like S. purpurea, the resulting hybrid has a tip, 

 but much weaker than that present in 5. fiava. 



In the matter of coloring, the blending is beautifully shown. 

 If a form with red markings be combined with a green form 

 showing no such markings, the hybrid will have the markings 

 reproduced at half the intensity of the parent. 



The flowers, in the matter of their size and shape, show a 

 marked blending, though here too the hybrid is inclined to 

 be larger and more showy than either parent. 



A remarkable series is shown in the comparative petal shape 

 and size. The figures given show how intermediate the hybrid 

 is in relation. 



In odor also the hybrid blends the parental characters — 

 for instance, 5. fiava has a very decided and unpleasant odor, 

 while 5. Drummondii has a rather delicate sweet scent. Their 

 hybrid has a stronger odor than 5. Drummondii, but not at all 

 unpleasant. 



The intermediate relation in the matter of flower coloring 

 in the three sets has been noted. Quite noticeable is the pecu- 

 liar maroon color obtained in the hybrids with 5. Drummondii 

 as a parent. 



All of these examples of blending parental characters seen 

 in the hybrids are such as any one can note with the naked eye. 

 The intermediate relation is, however, much more intimate and 



