496 University of California Publications in Botany [Vol. 5 



tral axis reaching a height of 150 to 175 em. While strong laterals 

 develop they do not originate at the base of the plant as in calycina. 

 and they do not overtop the central axis. These characteristics to- 

 gether with the broad spreading basal leaves give the plant its pyra- 

 midal or conical shape. The leaves are very close in general shape to 

 those of calycina, but they taper less abruptly to either end. The apex 

 is prolonged into a fairly long point curved to one side, and the base 

 is expanded into two broad, partially clasping auricles. 



The inflorescence consists of a more ample panicle than that of 

 calycina. The flowers are light pink in color, identical in this respect 

 wdth those of angustifolia. The tube and infundibulum are narrow, 

 gradually increasing in diameter from below in a funnel-shaped 

 fashion. The corolla lobes are broad at the base, but have long, 

 slender incurved points. Capsule and calyx present no very charac- 

 teristic features, although the calyx is persistent in contrast to the 

 deciduous calyx of calycina. 



It will be seen from the foregoing descriptions that there are a 

 number of distinct character contrasts between calycina and virginica, 

 a brief note of which may well be made at this point. In flower color, 

 red of calycina is contrasted with light pink of virginica, the same 

 contrast which existed in the angustif olia-macropliylla series. Simi- 

 larly the split hose-in-hose flower of calycina is contrasted with the 

 normal one of virginica; low stature with tall ; and a less decided 

 contrast in leaf shape exists, depending upon the presence or absence 

 of auricles at the base of the leaf. 



2. P, OP THE CALYCINA-VIRGINICA SERIES 



In the season of 1910, 55 plants of lOF^His and 58 of IOF^Hoq were 

 grown. In the season of 1911, 10 plants were grown of each of 

 llFjHis and llFiH^^. 



Like other hybrids which have been grown, these populations were 

 uniform and equivalent throughout. It was thought that lOFjHoo 

 showed a more distinctly pronounced trace of calycina characters than 

 did lOF^H^g, but the populations of the same seed grown in !1911 

 showed no appreciable difference in this respect. 



In general appearance the F^ plants resembled virginica more than 

 they did calycina. The plants were somewhat shorter than virginica, 

 running up to 135 em. In these plants it was noted that some of the 

 laterals overtopped the central axis as they do in calycina. The in- 

 florescence was in general of the ample type characteristic of calycina. 



