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or smaller flowers than usual, are of common occurrence, 

 in groups of seedlings. The disposition to vary in size and 

 colour is a point of considerable interest. 



The specimens which served as material for the greater 

 part of the present investigations were propagated from a 

 few plantsof one type, chiefly by leaf-propagation, a method 

 which is easily carried out in this case, There is much rea- 

 son to believe that they were all vegetatively propagated 

 from one original plant. It is important to keep this in 

 mind. 



The calyx is garaosepalous, the lobes acuminate and 

 hairy. The corolla is gamopetalous, the three lower.petals 

 forming a lip on which an insect can rest (figs. 2-5). The 

 tube is comparatively short. The deep colour of the corolla 

 extends to the throat. 



The stamens (figs. 2-6) are two in number, and epipeta- 

 lous. Three staminodes complete the androecial whorl. In 

 some instances they appear as minute white pegs, but very 

 often they are discernible only as white lines in the inner 

 side of the corolla-tube. The filaments of the functional sta- 

 mens are cylindrical above, tapering and two-edged below. 

 By their curvature an oval space is formed between them 

 (fig. 6). The anthers are bright golden yellow, and conse- 

 quently stand out in striking contrast with the deep blue of 

 the corolla. They are single-celled at maturity. Their 

 aplces are united by a small tissue-fusion (fig. 5, A). The 

 opposed faces are in close contact, quite flat, and perfo- 

 rated by a triangular aperture of dehiscence (fig. 5, p). 

 The aperture is at first covered by a transparent mem- 

 brane. 



