BIOTYPES AND HYBRIDS. 



25 



g-iiarded ag'ainst cross-pollination. The 150 offspring: (06190) were some- 

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

 doubted characters of B. bp. rhomboidea (fig". 18). 



Bursa bursa-pastoris simplex n. sp. element. 



This biotype is like /?. bp. ton/is in that the sinuses never reach the mid- 

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

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

 secondary lobing", even in the most vig^orous specimens, except some slig-ht 



Fig. 10,.— 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, thoug-h it is possible that his 

 C. bp. haiiniensis (his fig's. 33 and 34) is identical with my B. bp. simplex. 

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

 quite absent might be placed here, but in most cases his fig'ures 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. 



