Further Studies on the Apogamy and Hybridization of the Hieracia. 265 



Several experiments of crossing the hybrids with the parent species 

 have hitherto given no results of interest, the offspring always being 

 like the mother plant, i. e. the offspring have always been produced 

 apogamically, the crossing being quite ineffective. The experiments 

 made may just be enumerated: 



a. H. excellens x [excellens x atirantiacum. No. 464]. Result: 

 3 pure H. excellens. 



b. H. {excellens x aurantiacuin, No. 463] x aurantiacuui. Result: 

 19 individuals, like No. 463. 



C. H. excellens X [excellens X aurantiacuiii, Fq of No. 464] Result: 

 29 pure H. excellens. 



4. II. excellens x pilogelfa. 



By crossing, in 1904, //. excellens with H. pilosella there came out, 

 besides some pure H. excellens, 8 hybrid specimens, which did not 

 behave quite as the hitherto mentioned hybrids, being indeed some- 

 what heterogeneous, but not in the same degree as these. 



Here follows a list over this family of hybrids with characteristics: 



No. 501. Vegetative part vigorous; well developed stolons; the 

 corymb with long scape and many subumbellate heads of which some 

 indeed on long stalks issuing from the lower part of the scape; on 

 the whole rather near H. excellens, but a little coarser and lower and 

 the heads a little larger; female. 



No. 5O2. Much as the preceding and also female, but perhaps 

 still a little nearer H. excellens. 



No. 50 3. Much as the preceding, also female. (A not typical, 

 slender and few-headed corymb from an autumnal flowering has been 

 figured in 1906 as fig. 6.) 



No. 5O4. Low and nearer to //. pilosella; the corymbs with few, 

 distant and long-stalked, large heads; hermaphrodite; yet the rosette 

 leaves resemble those of H. excellens. 



No. 50 5. Much as the foregoing; hermaphrodite. 



No. 506. Died without flowering, but was an evident hybrid. 



No. 50 7. Also died without flowering. 



No. 508. Tall and vegetatively vigorous with subumbellate rich 

 corymb on a long scape; resembles 50 2 and 50 3, and female. 



If we do not consider the two hybrids that died before flowering, 

 we have six individuals left, and of these the four were fairly, but 

 not absolutely, alike, and near //. excellens from which they differed 



