330 



['nivositji of Ciilifdniid J'liljlicdiions in A<iriciiUi(i-<il Seiences [Vol. 2 



and sibirica, althouo-h somewhat similar in both habital and fruit 

 characters (see figs. 6, 7), are very distinct from each otlier in many 

 respects and have the same general native and distributional habitats, 

 all of which would indicate that they are not closely related species. 

 The three species of Catonia studied diflfer greatly cytologically. 

 Aurea (N = 5) is rather ditferent in individuality from the other 

 species with 5 pairs. Blattarioides (N^4) has a chromosome group 

 much like that of ieciorum, while sihirica has 5 pairs of very large 

 chromosomes resembling those of Dioscoridis, pulchra, and palaestina. 

 Three other species in this section have been counted recently. l)ut as 

 no measurements have yet been made, they are not included in table 3 

 (see p. 331). 



TABLE 3 



Tabulatiox of Twenty-one Species of Crepis According to a Tentative New 



Taxonomic Grouping and with Reference to Number and Length of 



Chromosomes. (The Length Values Eepresent Averages 



FROM Ten Different Cells.) 



Sec. II. Anisoderis 



atiitna 



foetida 



rubra 



Sec. III. Barkbausia 



bursifolia 



setosa 



tdraxacifolia.. 

 Nemaucbenes 



Sec 

 Sec 



IV. 



v.* 



an/XTri. 



Sec. VI. 



Sec. 

 Sec. 

 Sec. 

 Sec. 



VII 

 VII 

 IX. 

 X. 



Dioncoridis.. 

 palaestina. .. 



pulchra 



Eucrepis 



capillaris 



pari) flora 



lectorum 



tnontana 



biennis 



. Toungia 



jiipiinira 



I. Aetheorrbiza 



bullidsa 



Omalocline 



iiurea 



Soyeria 



xibirica 



blattarioides.. 



Number of Chromosome Pairs 



26.2 

 25.0 

 29.4 



24.3 

 22.3 

 26.1 



23.9 



3.5.9 

 34.1 

 36.7 



26.2 

 25.3 

 28.1 

 26.8 

 (20 



15.7 



13.9 



21.0 



41.9 

 29.0 



21.3 

 20.8 

 23.9 



22.0 

 17.8 

 23.3 



21.5 



29.3 

 27.0 

 30.6 



20.4 

 20.5 

 23.2 

 21.4 

 pairs; t 



13.5 



12.8 



18.0 



32.4 

 23.8 



14.5 

 17.7 



18.5 



19.5 

 14.0 

 21.2 



19.7 



24.9 

 24.6 

 25 . 5 



14,8 

 14.4 

 20.2 

 17.7 



12.2 



12.1 



10.2 



27.6 

 20.6 



13.1 

 15.8 

 16.2 



12.7 



9.1 



17.8 



17.5 



19.3 

 21.2 

 19.3 



9.7 

 17.2 

 16.0 



11.5 

 11.7 

 15.1 



23.2 



17.7 



12.2 

 14.4 

 14.9 



15.2 



10.8 

 11.1 

 13.2 

 IS. 5 



12.5 



10.0 

 10.6 



9.7 

 10.1 



9.2 

 9.6 



8.6 



* Oatyona, Cymboseris, and Pbaecasitim (■onibined. 



t Xot measured; size range mucli like that of species in this group. 



