Other Characters in Oenothera Lamarckiana. 483 



the first place, I have never seen fewer than four sepals 

 or petals or divisions in the ovary, and never fewer than 

 8 stamens. The variation is solely on one side : at any 

 rate it has been so during the nine years covered by the 

 above mentioned observations, and since then as well. 

 Trimerous flowers, which could hardly escape the atten- 

 tion of even the most superficial observer, are certainly 

 not present.^ The 'half Galton-curves' are obtained by 

 considering variability of sepals, petals, etc. separately. 



For the sepals : 



21 Ks 4 Ke 2 K7 Total, 27 flowers. 

 For the petals : 



23 C5 3 Ce 3 C7 Total, 29 flowers. 



For the partitions of the fruit : 



18 O5 3 Oe 1 O7 Total, 22 fruits. 



I have often seen pentamerous fruits, not only at 

 Hilversum but in my own cultures. They were especially 

 common in O. Lamarckiana and O. laevi folia ; but I have 

 seen them in the other species as well. I have rarely 

 seen 6- and 7-partite fruits, and 8-partite ones never, 

 so far. 



The curve for the stamens in the above table turns 

 out somewhat differently: 



2 S9 21 Sio 1 Sii 2 S12 2 Si4 Total, 28 flowers. 



But we must bear in mind that the numbers of sta- 

 mens are usually even. Now if we omit the odd num- 

 bers, as we did with the split petals, we get a beautiful 

 half-Galton-curve : 21 Sio — 2Si2 — 2Si4. 



^ In O. biennis T sometimes, though very rarely, found trimerous 

 and even bimerous flowers. I have also seen some in my hybrid 

 cultures. See also, A. Weisse, on O. biennis (K3 Ca So Go) in 

 Verhandl. Brandenb. Jahrg. 39, 1897, p. XCIV with figure. 



