BIOTYPES AND HYBRIDS. 



17 



050.80: Another orig-inal culture which now seems to belong: to B . dp. 

 heteris was the offspring' of a very robust plant collected in a dooryard near 

 Cold Spring- Harbor, Long- Island, April, 1906. This plant was taken up 

 and potted in the greenhouse, where its pollination was g;uarded. The 

 earlier leaves of this plant were recog'nized as resembling- B. bp. heteris y ex- 

 cept in the less sharp attenuation of the primary lobes, but later leaves— 

 the climax-leaves — were larg-e, and, in addition to the secondary lobes 

 characteristic of B. bp. /leteris, they had somewhat quadrang-ular secondary 



Fig. ^.— Bursa bursa-pastoris heteris. Offspring of sib of plant shown in fig. 5. 



lobes in the proximal axils of the primary lobes, and these square lobes 

 were sometimes almost cut off from the primary lobes, giving" the leaf the 

 peculiar form usually described as interruptedly pinnate (fig-. 7). The 

 seeds of this plant were sown May 23, 1906, and produced 352 offspring:. 

 These were badly damagfed by the thrips, 81 being: killed and 57 so stunted 

 as to make an estimation of their characters uncertain. The remaining- 

 214 formed a consistent group unlike its parent and also unlike any other 



