 The gradual development of blue to violet pigmentation as one progresses from species to species is an interesting phenomenon deserving further study . The climax is reached in L. indigo which is blue throughout . L. chelidonium and its variety chelidonioides , L. paradoxus , and L. hemicyaneus may be considered as mileposts along the road to L. indigo . 
 The gradual development of blue to violet pigmentation as one <a href='uninflect' title='1'><mark>progresses</mark></a> from species to species <a href='drop_aux' title='2'><mark>is</mark></a>an interesting phenomenon deserving further study . The climax is reached in L. indigo which <a href='drop_aux' title='3'><mark>is</mark></a>blue throughout . L. chelidonium and its variety chelidonioides , L. paradoxus , and L. hemicyaneus may be considered as mileposts along the road to L. indigo . 
Da gradual development of blue to violet pigmentation as one progress from species to species an interesting phenomenon deserving further study . The climax is reached in L. indigo which blue throughout . L. chelidonium and its variety chelidonioides , L. paradoxus , and L. hemicyaneus may b considered as mileposts along the road to L. indigo .