1922 



SctchcU-Goodspccd-Clausen : Nicotiana Tahacum 



497 



The flower color was a deep pink intermediate between the two 

 parents. The flower shape was normal throughout save that on every 

 plant there was a small percentage of calyces with one or more pink 

 and somewhat broadened calyx tips, or with a streak of white on one 

 side. Sometimes these partially petaloid calyces were partly decid- 

 uous. In shape of flower the hybrid closely resembled virgimca except 

 that the corolla lobes were longer and more decidedly mucronate. 

 Calyx and capsule w^ere almost identical with those of virginica, the 

 calyx being typically persistent and accrescent. The leaves were some- 

 what broader proportionately than those of virginica, but they pos- 

 sessed the pronounced auricles of that parent. The usual gradation 

 in leaf shape on each plant from the broad basal leaves to the linear 

 bracts of the inflorescence was in evidence. 



The main features of Hjg and H^o are well illustrated in the draw- 

 ings of lOF^HisPn shown in plate 81. The general habit and charac- 

 ters are illustrated in the photograph of lOFiHigP^^ which is repro- 

 duced in plate 83, figure 1. 



3. Fo OF THE CALYCINA-VIRGINICA SERIES 

 In the season of 1911 four Fo families of the calycina-virginica 

 series were grown, viz., llFoHi^Pa,.,, llFjHigPin, llF-.H^oPv, ^^^ 

 llF,H,,P,e. 



As in the angustifoUa-macrophylla series, the segregation exhibited 

 in those four families, comprising 97 plants, was nothing short of be- 

 wildering, and in most cases an intergrading series of forms connected 

 one character expression with another. However, an attempt was 

 made to classify the plants into categories suggested by the four pairs 

 of character contrasts existing between the parents. The results of 

 this classification are given in table 8. 



TABLE 8 



NUMERICAL DATA FROM F2 POPULATIONS OF THE CALYCINA-VIRGINICA SERIES. 



