Chap. I. PRIMULA AUKICULA. 43 



Primula aukicula.* 



This species is heterostyled, like the preceding ones ; but 

 amongst the varieties distributed by florists the long-styled 

 form is rare, as it is not valued. There is a much greater 

 relative inequality in the length of the pistil and stamens in 

 the two forms of the auricula than in the cowslip ; the pistil 

 in the long-styled being nearly four times as long as that in 

 the short-styled, in which it is barely longer than the 

 ovarium. The stigma is nearly of the same shape in both 

 forms, but is rougher in the long-styled, though the differ- 

 ence is not so great as between the two forms of the cowslip. 

 In the long-styled plants the stamens are very short, rising 

 but little above the ovarium. The pollen-grains of these 

 short stamens, when distended with water, were barely 

 Tg^TSTS of an inch in diameter, whereas those froni the long 

 stamens of the short-styled plants were barely tbVt, show- 

 ing a relative difference of about 71 to 100. The smaller 

 grains of the long-styled plants are also much more trans- 

 parent, and before distension with water more triangular 

 in outline than those of the other form. Mr. Scott t com- 

 pared ten plants of both forms growing under similar con- 

 ditions, and found that, although the long-styled plants 

 produced more umbels and more capsules than the short- 

 styled, yet they yielded fewer seeds, in the ratio of 66 to 

 100. Three short-styled plants were protected by me from 

 the access of insects, and they did not produce a single seed. 

 Mr. Scott protected six plants of both forms, and found 

 them excessively sterile. The pistil of the long-styled form 

 stands so high above the anthers, that it is scarcely possible 

 that pollen should reach the stigma without some aid; 

 and one of Mr. Scott's long-styled plants which yielded, 

 a few seeds (only 18 in number) was infested by aphides. 



* According to Kemer, our gar- and the short- styled 98 seeds per 



den auriculas are descended from capsule : see his " Geschichte der 



P. puiescens, Jacq., which is a hy- Aurikel," 'Zeitschr. desDeutsch- 



brid between the true P. aurictUa en und Oest. Alpen-Vereins,' Band 



and hirsuta. This hybrid has now vi. p. 62. Also ' Die Frimnlaceen- 



been propagated for about 300 Bastarten,"Oest. Bot. Zeitschrift,' 



years, and produces, when legiti- 1835, Nos. 3, 4, and 5. 



mately fertilised, a large number t Joum. Linn. Soc. Bot.,' vol. 



of seeds ; the long-styled forms viii., 1864, p. 86. 

 yielding an average number of 73, 



