No. 547] GENETIC AL STUDIES OX (EX OTHER A 411 



types. It may be said, however, that the green rosettes 

 inclined more towards the female parent of the cross, 

 graudiflora B, than towards the male, biennis A. The 

 plants set in the ground numbered 1,310 green rosettes 

 and 141 etiolated. 



The green rosettes were set out with the more gruudi- 

 flora-Yike at one end and the more bieuuisA"ike at the 

 other. In general the plants at the more graufli flora- 

 like end were at maturity considerably larger 1.5 2 in. 

 high, than those towards the more bieuuis-Y\ke end where 

 a small group of plants (about 20) remained small, 6 

 dm.-1.2 m. high. Among the larger plants were many 

 (about 50) with flowers as large as or larger than those 

 of the grandi flora parent, but these could not be sepa- 

 rated as a class since the variation on individual plants 

 was considerable and they intergraded with great per- 

 fection into the mass of the culture. The smaller plants 

 at the more bieuuis-like end were variable, but all had 

 flowers 2 4 times larger than those of the biennis parent. 

 The larger flowers had petals measuring 4 4.5 cm. long 

 (those of graudiflora B are about 3.3 cm. long) ; these 

 flowers were therefore as large as the largest-flowered 

 types of Lamarckiana. The large flowers also, as a -rule, 

 presented the graudiflora relation of the stigma to the 

 anthers, L e., the stigma lobes were well above the tips of 

 the anthers. Thus in flower size the culture showed a 

 clear segregation, but inclined markedly towards the 

 larger size of the graudiflora parent, in many cases sur- 

 passing this flower in its measurements. 



The foliage of the culture presented a range of varia- 

 tion that defied my attempts at classification. That of 

 some of the larger-flowered plants closely resembled 

 graudiflora, and a few of the smaller plants had a foliage 

 approaching that of biennis, but the leaves throughout 

 the culture as a whole were larger than those of the 

 parents of the cross and generally distinctly crinkled. 



The mass of the culture was fairly close to the F t 

 hybrid plant, 10.30La, from which it came, but there was 



