POLYPETALAE, 67 
tached to the ventral suture of the ovary. 
Seeds without an aril. Flowers race- 
mose or panicled. Ranunculaceae. 
(6) Shrubs. Leaves entire or dentate. Sepals 
persistent. Ovules 2, basal, rarely more 
numerous and attached to the ventral 
suture of the ovary. Seeds furnished 
with an aril. Flowers solitary or pani- 
cled. Tropics and Australia. 
Dilleniaceae. 
45 (a) Ovules 2, inserted on a free central 
placenta, or more numerous, and in- 
serted on a basal or central placenta. 
Leaves exstipulate, entire. Calyx-lobes 
valvate. Style terminal. Lythrarieae. 
(0) Ovules 2, basal apical or sutural, or more 
numerous, and inserted on the ventral 
suture of the ovary. Leaves usually 
stipulate. 46. 
46 (a) Calyx-lobes imbricate or open in aestiva- 
tion. Petals imbricate or open, 4-12. 
Ovules 2. Flowers usually racemose, 
Leaves usually simple. Rosaceae. 
(2) Calyx-lobes valvate or closed in aestiva- 
tion. Petals usually valvate or 1-3. 
Ovules usually more than 2, rarely 2 
and descending, and then flowers spicate 
