BIOTYPES AND HYBRIDS. 



19 



there is no incision on either margin of the lateral lobes and hence no 

 rounded lobe corresponding- with what I have called the "secondary lobe " 

 in B. bp. hcteris, though there may be a slight expansion of leaf-tissue in 

 that region, especially in strongly developed specimens, which no doubt 

 corresponds to the secondary lobe (fig-. 9). All the lateral lobes tend to 

 be more or less slender, elongated, and acute. In the more robust speci- 

 mens there is apt to be some secondary lobation, but in all cases these 

 secondary lobes are also attenuate. A secondary spur directed outward 



FIG. S. Bursa biirsa-pastoris heteris (?) grown from seed received from 



Tucson, Arizona. 



and proximad from near the base of the lateral lobes is often noted in 

 well-developed plants belonging- to this biotype (fig 1 . 10). In many in- 

 stances the long', slender lobes are somewhat recurved at the tips, but in 

 other cases all lobes are practically straight. Under this type may belong 

 Almquist's C. bp. pedemontana (his fig-. 17), leontodon (fig. 31), dentata 

 (fig. 35), facerata (fig\ 37), bergiana (fig". 38), laxa (fig. 39), querceti (fig". 

 40), ramselensis (fig'. 41), and linearis (fig. 58). 



