BIOTYPES AND HYBRIDS. 



25 



gfuarded against cross-pollination. The 150 offspring (06190) were some- 

 what diseased and stunted for a time, but subsequently developed un- 

 doubted characters of ^. bp. rhomboidea (fig-. 18). 



Bursa bursa-pastoris simplex n. sp. element. 



This biotype is like B. bp. tenuis in that the sinuses never reach the mid- 

 rib, but it differs in having mostly simple rounded or triangular acutish 

 lobes, not attenuate. No incisions are seen in the lobes and there is no 

 secondary lobing, even in the most vigorous specimens, except some slight 



Fig. 16. — Bursa bursa-pastoris rhomboidea from the second original family. 



denticulation (fig. 19). I am in doubt as to whether any of Almquist's 

 named forms can be referred to this biotype, though it is possible that his 

 C. bp. hauniensis (his figs. 33 and 34) is identical with my B. bp. simplex. 

 His C. bp. gallica (fig. 62) and several others in which lobes are almost or 

 quite absent might be placed here, but in most cases his figures show evi- 

 dence that the plants had lost their characteristic lobing through some un- 

 favorable cultural conditions, and if this was the cause of the reduction of 

 the lobes, such specimens might belong to any other biotype. 



