No. 518] GENETIC AL STUDIES ON (EN OT II EE A 113 



but were very marked. The leaves in general were bien- 

 ms-like in form, but slightly larger in their measurements. 

 Those on the lower portion of the main stem, which in 

 Lamarchiana are 20 em. or more in length and much 

 crinkled, were in the hybrid only 11 cm. long and exhib- 

 ited only a very slightly crinkled surface. The leaves 

 along the upper portions of the branches and the bracts 

 of the inflorescences were on the contrary larger than 

 those of Lamarckiana and the inflorescence was, therefore, 

 conspicuously larger leaved. The rosette condition of 

 this plant, as grown in the hot house, was too transitory 

 to give satisfactory conclusions as to what its character- 

 istics would have been if given the opportunity of a more 

 prolonged development. 



This hybrid set seed abundantly when the flowers were 

 self -pollinated. Less than 50 per cent, of the pollen was 

 abortive. The normal grains were almost entirely 3- 

 lobed like the pollen of the parents, but occasional 4- 

 lobed grains were present. 



5. grandiflora X biennis. The parents of this recipro- 

 cal cross were the same individual plants employed in the 

 preceding (4). The culture consisted of twenty plants 

 which fell clearly into two groups (twin hybrids) with 

 greater resemblances to one or the other of the parent 

 forms. 



Nine of the hybrids were grandifloraAike in foliage 

 and habit, the leaves being lanceolate in form, longer, 

 narrower and more pointed than those of biennis, and the 

 plants taller (1.3 m.), presenting also the numerous 

 heavily flowered aide shoots characteristic of grand/flora. 

 The flowers were intermediate in form and measurements 

 between those of the parent types, and essentially similar 

 to the flowers of Lamarckiana. Five of these hybrids 

 developed large rosettes with leaves similar in form to 

 those of biennis but more pointed ; the leaves of four of 

 the rosettes exhibited marked crinkles like those of 

 Ln >>hirrkiana. 



The remainder of the hybrids of this cross resembled 

 the biennis parent in foliage and habit, The leaves were 

 broadly elliptical or ovate in form, shorter than those of 



