[Vol. 2 



262 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



tives along the margins of the uppermost lobes of the corolla, 

 while that on the broad upper surface disappears. It is to 

 be recalled that it is the color of this region which is variously 

 disposed in other species of the genus. 



The corolla lobes were irregularly incised in the flowers of 

 the first and second seasons of the Fi, as they have been seen 

 to be in the original, but in the second generation of both 

 derivatives cultivated at the Desert Laboratory this effect per- 

 sists as a regular wedge-shaped incision of the lower lip only, 

 and is not seen in every individual of both derivatives, 

 although the seeds were from plants which may have been 

 pollinated by the parental form. 



Seedlings from the original stock grown from seeds gath- 

 ered on the Santa Catalina Mountains in Arizona were sowed 

 early in 1910 at the Desert Laboratory and the plantlets pre- 

 served on April 15 furnished the data : 



First pair of leaves smaller than in the derivative, being only 

 13-15.5mm. wide and 16-18mm. long, obscurely dentate with 

 not more than two or three blunt teeth showing on each side. 

 The petioles were 12-16mm. long. The third pair of leaves 

 above the cotyledons, which probably were not quite mature, 

 had petioles 20mm. long, and laminae 22-25x50-52mm. Mar- 

 ginal stalked glands were so numerous that 15-20 appeared 

 in the field of the microscope at one time, and these structures 

 were very numerous on the petioles. It is to be noted that 

 differences in the last-named feature between this original and 

 the derivatives disappear in the adult, or on the leaves appear- 

 ing in the later stages. 



Seeds from the original two derivatives matured at Carmel 

 late in the summer of 1913 were sowed in the greenhouse at 

 Tucson in November, 1913. But one plant of albida, the ex- 

 tremest departure, survived, while four of rufida were secured. 



These, of course, represented the F2 of the departures. The 

 measurements of rufida correspondent with those of the 



original are as follows : First three leaves deeply incised, five 

 or six teeth on a side, abruptly pointed. Petioles 18-22mm. 

 long, laminae 21-26mm. wide and 41-45mm. long. Mature 

 leaves on sixth, seventh and eighth internodes, with petioles 



