82 HETEEOSTTLED DIMOEPHIC PLANTS. Chap. III. 



important distinction is, that the five stigmas in the 

 short-styled form diverge greatly from one another, 

 and pass ont between the filaments of the stamens. 



Fig. 4. 



Long-styled form. Short-styled form. 



s s stigmas. 



LmtTM GEANCIFLOBUM. 



and thus lie within the tube of the corolla. In the 

 long-styled form the elongated stigmas stand nearly 

 upright, and alternate with the anthers. In this latter 

 form the length of the stigmas varies considerably, 

 their upper extremities projecting even a little above 

 the anthers, or reaching up only to about their middle., 

 Nevertheless, there is never the slightest difficulty in 

 distinguishing between the two forms ; for, besides the 

 difference in the divergence of the stigmas, those of 

 the short-styled form never reach even to the bases 

 of the anthers. In this form the papillae on the stig- 

 matic surfaces are shorter, darker coloured, and more 

 crowded together than in the long-styled form ; but 

 these differences seem due merely to the shortening 

 of the stigma, for in the varieties of the long-styled 

 form with shorter stigmas, the papillae are more crowded 

 and darker-coloured than in those with the longer 



