BIOTYPES AND HYBRIDS. 



Fig. 13. 



21 



Fig. 12. 

 Fig. 12. — Bursa bursa-pastoris rhoniboidea. Grown in best light-relations pos. 



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

 Fig. 13. — Bursa Bursa-pastoris rJiomboidea modified by growing in dim light. 



