

[Vol. 2 



260 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Another feature that received attention was the fact that 

 branches formed in the closing part of the cycle of develop- 

 ment of shoots bear leaves very much smaller than those aris- 

 ing from the median part of the main stem during the first 

 part of the season. The flowers borne on these branches are 

 also much paler than those on the more robust branches. 

 Peloric flowers sometimes appear near the apices of the in- 

 florescences in this as well as in other species of the genus. It 

 is to be noted also that the divisions of the corolla are 

 variously and irregularly incised on individuals at times dur- 

 ing the season, but these are not heritable and do not appear 

 in any regular manner. 



This scrophularia appearing to offer some promise, several 

 ovaries of a plant at Carmel were treated with solution of 

 potassium iodide, one part in forty thousand, in July, 1911, 

 and the ripened capsules were collected in September of that 

 year. No record was made as to the time of day (see page 



268) and nothing may therefore be said as to the possibilities 

 of the action of the reagent on egg or pollen nuclei, singly, 

 together, or after fertilization. No other species of Scro- 

 phularia grew near the cultures at that time. 



The seeds were sown in suitable pans of screened soil, and 

 in February three plantlets had survived. In May these were 

 set in the open and their development followed. One formed 

 a shoot fairly equivalent to the normal, finally producing 

 flowers in which the anthocyans of the flowers were of a notice- 

 ably deep hue. The two remaining plantlets were character- 

 ized by a succulent aspect of the leaves, and by a lighter or 



color of the leaves and stems. Inflorescences were 

 matured late in 1912, and the flowers on one of the derivatives, 

 as they may be called, were so completely lacking in color as 

 to be a cream-white, this derivative being designated as albida, 

 while the other showed some marginal color and a rusty tinge, 



and was designated as rufida. 



Some disturbance of the relative velocities of development 



of the fibrovascular elements and mesophyll had taken place 

 in both forms, so that the leaves were variously bowed and con- 

 vexed and the two halves of the laminae were unequal and the 



ow 



