BIOTYPES AND HYBRIDS. 



Fig. 13. 



21 



Fig. 12. 

 FIG. 12. Bursa bursa-pastoris rhomboidea. Grown in best light-relations pos. 



sible in sky-lighted room. Characteristic incisions not well developed. 

 FIG. 13. Bursa Bursa-pastoris rhomboidea modified by growing in dim light. 



