CHAP. V. HETEKOSTYLED PLANTS. 239 



and raised 11 seedlings, which were all long-styled. These 

 plants were named for me by Dr. Hooker. They differed, as haa 

 teen shown, from the plants belonging 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 of seed when self-fertilised. Plants of the long- 

 Btyled form of Pulmonaria angustifolia were, like Hildebrand's 

 plants, absolutely sterile with their own pollen, so that I could 

 never procure a single seed. On the other hand, the short- 

 styled plants of this species, differently from those of P. offi- 

 cinalis, were fertile with their own pollen in a quite remarkable 

 degree for a heterostyled plant. From seeds carefully self-fer- 

 tilised I raised 18 plants, of which 13 proved short-styled and 

 5 long-styled. 



POLYGONUM FAOOPYKUM. 



From flowers on long-styled plants fertilised illegitimately 

 with pollen from the same plant, 49 seedlings were raised, and 

 these consisted of 45 long-styled and 4 short-styled. From 

 flowers on short-styled plants illegitimately fertilised with pollen 

 from the same' plant 33 seedlings were raised, and these con- 

 sisted of 20 short-styled and 13 long-styled. So that the usual 

 rule of illegitimately fertilised long-styled plants tending much 

 more strongly than short-styled plants to reproduce their own 

 form here holds good. The illegitimate plants derived from 

 both forms flowered later than the legitimate, and were to the 

 latter in height as 69 to 100. But as these illegitimate plants 

 were descended from parents fertilised with their own pollen, 

 whilst the legitimate plants were descended from parents crossed 

 with pollen from a distinct individual, it is impossible to know 

 how much of their difference in height and period of flowering, 

 is due to the illegitimate birth of the one set, and how much 

 to the other set being the product of a cross between distinct 

 plants. 



Concluding Remarks on the Illegitimate Offspring of 

 Heterostyled Trimorphic and Dimorphic Plants. 



[\ is remarkable how closely and in how many points 

 illegitimate unions between the two or three forms of the 



* L,-t. Zeitung, 1 18G5, p. 13. 



