OUAP. V. HETEROSTYLED DIMORPHIC PLANTS. 213 



mately with pollen from the same form, the seedlings appear tc 

 belong invariably to this form. Thus Hildebrand states * that 

 long- styled plants of 0. toseu growing by themselves have been 

 propagated in Germany year after year by seed, and have always 

 produced long-styled plants. Again, 17 seedlings were raised 

 from mid-styled plants of U. hedysaroides growing by themselves, 

 and these were all mid-styled. So that the forms of Oxalis, 

 when illegitimately fertilised wth their own pollen, behave like 

 the long-styled form of Lythrum salicaria, which when thus fer- 

 tilised always produced with me long-styled offspring. 



PRIMULA. 

 PRIMULA SINENSIS. 



I raised during February 1862, from some long- 

 styled plants illegitimately fertilised with pollen from 

 the same form, twenty-seven seedlings. These were 

 all long-styled. They proved fully fertile or even 

 fertile in excess ; for ten flowers, fertilised with pollen 

 from other plants of the same lot, yielded nine cap- 

 sules, containing on an average 39 75 seeds, with a 

 maximum in one capsule of 66 seeds. Four other 

 flowers legitimately crossed with pollen from a legiti- 

 mate plant, and four flowers on the latter crossed with 

 pollen from the illegitimate seedlings, yielded seven 

 capsules with an average of 53 seeds, with a maximum 

 of 72. I must here state that I have found some 

 difficulty in estimating the normal standard of fer- 

 tility for the several unions of this species, as the 

 results differ much during successive years, and 

 the seeds vary so greatly in size that it is hard to 



* 'Ucber den Trimorphismus zu Berlin,' 21st June I860, p. 373; 

 in dor Gattung Oxalis: Mounts- and 'Bot. Zcitung,' 1871, p. 435. 

 bench tc dcr Akud. dcr Wisscn. 



