CHAP.V. HETEROSTYLED DIMORPHIC PLANTS. 239 



sion with pollen from the same plants, yielded only ten 

 capsules, containing the low average of 26.7 seeds. 



As bearing on inheritance, it may be added that 72 

 seedlings were raised from one of the red-flowered, strictly 

 equal-styled, self -fertilised plants descended from the simi- 

 larly characterised Edinburgh plant. These 72 plants were 

 therefore grandchildren of the Edinburgh plant, and they 

 all bore, as in the first generation, red flowers, with the 

 exception of one plant, which reverted in colour to the 

 common cowslip. In regard to structure, nine plants were 

 truly long-styled and had their stamens seated low down in 

 the corolla in the proper position ; the remaining 63 plants 

 were equal-styled, though the stigma in about a dozen of 

 them stood a little below the anthers. We thus see that 

 the anomalous combination in the same flower, of the male 

 and female sexual organs which properly exist in the two 

 distinct forms, was inherited with much force. Thirty-six 

 seedlings were also raised from long- and short-styled 

 common cowslips, crossed with pollen from the equal-styled 

 variety. Of these plants one alone was equal-styled, 20 

 were short-styled, but with the pistil in three of them rather 

 too long, and the remaining 15 were long-styled. In this 

 case we have an illustration of the difference between 

 simple inheritance and prepotency of transmission; for 

 the equal-styled variety, when self -fertilised, transmits its 

 character, as we have just seen, with much force, but when 

 crossed with the common cowslip cannot withstand the 

 greater power of transmission of the latter. 



PULMONARIA. 



I have little to say on this genus. I obtained seeds of 

 P. officinalis from a garden where the long-styled form 

 alone grew, and raised 11 seedlings, which were all long- 

 styled. These plants were named for me by Dr. Hooker. 

 They differed, as has been shown, from the plants belong- 

 ing to this species which in Germany were experimented on 

 by Hildebrand ; * for he found that the long-styled form 

 was absolutely sterile with its own pollen, whilst my long- 

 styled seedlings and the parent-plants yielded a fair supply 



' Bot. Zeitung,' 1865, p. 13. 



