MONOCHLAMYDEAE. 
1 (a) Ovary superior, almost superior, or 
naked. 2. 
(b) Ovary inferior, almost inferior, or half- 
inferior. 83. 
2 (a) Hermaphrodite and female flowers desti- 
tute of a perianth.* 3. 
(b) Hermaphrodite and female flowers pro- 
vided with a perianth. 19. 
3 (a) Ovary 1-celled. 4.- 
(b) Ovary several-celled. 15; 
4 (a) Ovule 1. 5. 
(b) Ovules 2 or more. 12: 
5 (a) Male flowers destitute of a perianth, or 
flowers hermaphrodite.** 6. 
(b) Male flowers provided with a perianth. 
Flowers unisexual. 9. 
* Compare Aroideae, which belong to Monocotyledons, 
but have frequently net-veined leaves. They are especi- 
ally characterised by their spadiciform inflorescence. 
** Compare some Urticaceae with a rudimentary peri- 
anth. Their flowers are inserted upon spreading or con- 
cave receptacles, and their perianth is reduced to 1 
segment or adnate to the receptacle. 
