CHAP. I. ANDROSACE. 53 



plant of the same form; and the results are very 

 striking. For the capsules from the long-styled flowers 

 thus treated contained, on an average, only 15.7 seeds 

 instead of 77.5; and those from the short-styled 6.5 

 instead of 18.7 seeds per capsule. The number 6.5 

 agrees closely with Mr. Scott's result from the same 

 form similarly fertilised. 



From some observations by Dr. Torrey, Hottonia 

 inflata, an inhabitant of the United States, does not 

 appear to be heterostyled, but is remarkable from pro- 

 ducing cleistogamic flowers, as will be seen in the last 

 chapter of this volume. 



Besides the general Primula and Hottonia, Andro- 

 sace (vel Gregoria, vel Aretia) vitalliana is heterostyled. 

 Mr. Scott * fertilised with their own pollen 21 flowers 

 on three short-styled plants in the Edinburgh Botanic 

 Gardens, and not one yielded a single seed; but 

 eight of them, which were fertilised with pollen from 

 one of the other plants of the same form, set two empty 

 capsules. He was able to examine only dried speci- 

 mens of the long-styled forms. But the evidence seems 

 sufficient to leave hardly a doubt that Androsace is 

 heterostyled. Fritz Miiller sent me from South Brazil 

 dried flowers of a Statice which he believed to be heter- 

 ostyled. In the one form the pistil was considerably 

 longer and the stamens slightly shorter than the corre- 

 sponding organs in the other form. But as in the 

 shorter-styled form the stigmas reached up to the 

 anthers of the same flower, and as I could not detect in 

 the dried specimens of the two forms any difference 

 in their stigmas, or in the size of their pollen-grains, I 

 dare not rank this plant as heterostyled. From state- 



* See also " Treviranus " in 'Bot. Zeitung,' 1863, p. 6, on this plant 

 being dimorphic. 



