64 Plant-Breeding 



3. Progressive elementary species, which are weaker 

 than the parent species, (E. albida and (E. oblonga. 



4. Organically incomplete forms, (E. lota (Fig. 19). 



5. Fertile but inconstant species forms, (E. scintillans 

 and (E. elliptica. 



The new species and varieties may be described as 

 follows : 



Group I, retrograde varieties, which have lost some 

 of the characters possessed by the parent, (E. Lamarkiana : 



(E. Icevifolia is easily distinguished from its parent, 

 (E. Lamarkiana, by having smooth, bright leaves, without 

 undulations. These leaves are narrower and more slender 

 than in Lamarkiana and the flowers of the brighter yellow. 

 This variety was constant from seed, showing no reversion. 

 It is a strong-growing plant and perfectly fertile. 



(E. brevistylis is a short-styled form. The ovary of 

 this plant is abnormally situated and is not conducive to 

 proper fertilization. The ovary is reached by only a few 

 pollen tubes and fertilization must be incomplete. The 

 few seeds that are obtained reproduce this type without 

 reversion to Lamarkiana. (E. brevistylis may be dis- 

 tinguished from the other forms before blossoming as 

 the buds are much shorter and thicker than in the other 

 species. The presence of leaves more rounded at the 

 tip also distinguishes this form from others before 

 flowering. 



(E. nanella is a dwarf form, attaining often only one- 

 fourth the height of the other types. The flowers on this 

 dwarf form are as large as upon Lamarkiana, which is a 

 striking feature. The size of the leaves is proportionate 

 to the height of the plant, but retain the same form as the 



