326 University of Valifnrnia Puhlicdiions in AfiricaUural Sciences [Vol.2 



ship Mith aurea, this species is cytologieally very different from all 

 other species of Crepis, having 9 pairs of short chromosomes. The only 

 species studied which it at all resembles in this respect is japunica, 

 which has 8 pairs of chromosomes of similar size. 



Fig. 6. Typical achenes of: u, Crepis bulbosa; v, C. japonica — v', cross-section 

 outline; w, C, aurea; x, C. blaitarioides. X 6.5 circa. 



Section IX, Eucrepis, contains six of our twenty-one species, and 

 on the basis of fruit characters alone (cf. fig. 5) they comprise three 

 groups, as follows : 1. capiUaris and parviflora; 2. n-eglecta, tectorum, 

 montana; 3. biennis. But if we consider habital and other morpho- 

 logical characters, they may be rearranged as folloAvs: 1. capiUaris, 

 parviflora, neglecta; 2. tectorum; 3. biennis; 4. montana. Such an 

 arrangement is of interest when considered in relation to the chromo- 

 somes of these species. It was noted (Mann, 1925) that the total 

 length of the chromosome group in capiUaris (N = 3) is practically 

 the same as that of neglecta (N = 4), while parviflora (N = 4) appears 

 to have a short chromosome added to a complex like that of capiUaris. 

 The chromosome group of tectorum (N=4) could not be differentiated 



