CHAPTER IV 
APETALH (MONOCHLAMYDE®) 
HIS group is also called Incomplete. The 
corolla is absent whilst the calyx is present. 
But there are petals in Illecebracez. 
The flowers may be borne in catkins with the 
perianth single and inferior. There is no perianth in 
Euphorbia. The flowers are unisexual in Euphor- 
biacez and Ceratophyllez, and vary between this 
and bisexualism in Chenopodiacez and Urticacez. 
The flowers are not in catkins, but have a single 
perianth, which is superior in Loranthacez, Santa- 
lacez, Aristolochiacee. 
The ovary is superior, with two to three stigmas, in 
Polygonacez, Chenopodiacez, Urticacez, Ulmacez, 
and in Thymelacez the stigma is undivided. The 
ovary is inferior in Loranthacez, Aristolochiacee, 
and Euphorbiacez. 
There are eleven families in this group, and we 
have included two and described four species to 
illustrate them. 
