2 NORTH AMERICAN FLORA 
Fruit baccate or an achene, or aggregate, never a utricle or an 
anthocarp. 
Flowers in axillary cones; fruit aggregate; endosperm none. 
Flowers never in axillary cones; fruit baccate or an achene 
or aggregate; endosperm present. 
Fruit a capsule, dehiscent by apical or longitudinal valves, or, if 
otherwise, a corolla present in the flowers; or the fruit rarely 
a 4-6-horned nut. 
Ovary 2-several-celled, or by abortion rarely 1-celled; corolla 
none, or of numerous petals. 
Ovary 1- ao corolla usualy present, of usually 5, rarely 6-16 
petals 
Sepals fewer than the petals, usually 2; leaves alternate or 
opposite, usually succulent, fleshy. 
Plants never with twining stems; ovules 2 to many. 
Plants with twining stems; ovule 1, 
Sepals of the same number as the petals, or the petals rarely 
wanting; leaves opposite, only rarely succulent. 
Sepals distinct; ovary sessile; petals not unguiculate. 
Sepals united; ovary stipitate; petals unguiculate. 
Fam. 4. 
Fam. 5 
Fam. 6. 
Fam. 7. 
Fam. 8. 
Fam. 10. 
Fam, 11. 
[VoLuME 21 
BATIDACEAE. 
PRTIVERIACEAE. 
‘TETRAGONIACEAE. 
PORTULACACEAE. 
BASELLACEAE. 
ALSINACEAE. 
CARYOPHYLLACEAE. 
