Chap. I. ANDEOSACE. 53 



the two illegitimate together yield seeds in the ratio 

 of 100 to 61. 



H. Mtiller also tried the effects of illegitimately fer- 

 tilising the long-styled and short-styled flowers with 

 their own pollen, instead of with that from another 

 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 genera Primula and Hottonia, Androsaoe 

 (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 hete- 

 rostyled. In the one form the pistil was considerably 

 longer and the stamens slightly shorter than the cor- 

 responding organs in the other form. But as in the 

 shorter-styled form the stigmas reached up to the anthers 



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

 being diraorphio. 



