82 



HETEROSTYLED DIMORPHIC PLANTS. Chap. III. 



important distinction is, that the five stigmas in the 

 short-styled form diverge greatly from one another, 

 and pass out between the filaments of the stamens, 

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



Fig. 4. 



s 



Long-styled form. . Short-styled form. 



8 8, stigmas. 



LlNUM GRANDIFLORUM. 



long-styled form the elongated stigmas stand nearly up- 

 right, 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 



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