1915] 



MACDOUGAL MODIFICATION OF GERM-PLASM 263 



36-45mm., and laminae 36-56x85-100mm. Marginal glands 

 showing 6-10 in field, few on the petioles. 



The single plantlet of albida bore leaves, the first pair of 

 which were not deeply cut, the three or four teeth on each side 

 being abruptly but sharply pointed, the petioles 15mm. long, 

 and the laminae 24r-26x35-38mm. The leaves from the sixth, 

 seventh and eighth internodes had petioles 30-40mm., and 

 laminae 45-51x90-100mm. Not more than four stalked glands 

 might be seen in the field at any one time. These trichomes 

 were very sparsely distributed over the under surface of the 

 petioles only. The greater relative width of these leaves was 

 correlated with a greater angle of divergence of the lateral 

 veins from the midrib, a feature which, as will be shown later, 



was to be observed in adult plants. 



The three plants representing the progeny of the treated 

 individual were established in a row within a half meter of 

 each other at Carmel in 1912. Irregular clusters of long 

 thickened roots were formed, and these, as is customary with 

 the species, bear buds and are a means of propagation of the 

 plant. The three plants were taken up in November, 1913. 

 While the main clumps could be identified, yet broken frag- 

 ments of roots were preserved which could not be assigned to 

 any one of the three, and although these were and are still pre- 

 served they are not taken into account here. 



Albida was divided in May and June, 1914, and portions 

 were sent to cooperators in New York, St. Louis and Chicago, 

 but all failed to survive this unseasonable transplantation, so 

 that at the present time this strain is represented by only two 

 clumps, one of which is at the Desert Laboratory and the other 

 at the Coastal Laboratory. The single plant of albida 

 bloomed at Tucson early in the year, while the one at Carmel 

 reached that stage too late to mature seeds. 



Rufida was divided into three clumps and reset in the garden 

 at the Coastal Laboratory in November, 1913. The shoots 

 from these began to open flowers in July, 1914, which corre- 

 sponded in all essential particulars with those of the previous 

 seasons except that they were more highly regular. Two were 

 enclosed in small glass cages for protection and to insure 



