Fig. 170. — Lobelia Eeinus showing single flowers and various grades of 



DOUBLES. 



a, single, b, calyx single, corolla double, c, calyx single, corolla treble. 

 T>, calyx single, corolla multiple, e, calyx double^ corolla single, f, calyx 

 double corolla double, g, calyx multiplex, corolla absent. 



