2 
'_Flowers greenish, or scaly, or membranous, with- 
out any white or coloured petals (or petal-like | 
segments). Sect. G. (page 22). 
Flowers with some or all of the segments white or 
coloured, and petal-like. 
Calyx absent, or of 2 sepals or segments only, 
or (if present) with all its segments white or | 
coloured, and petal-like. Sect. H. (page 24). 
Flowers with a distinct calyx (with more than 2 seg- 
ments or teeth) and corolla. fe 
Corolla-segments united more or less com- AN 
pletely in one piece. , 
L Sect. I. (page 26). 
Corolla with the petals separate and aie aeG 
tinct to their base. 
Sect. J. (page 29). 
