POLYPETALAE. 69 
(6) Style distinctly discernible. Shrubs or 
trees. Albumen copious, fleshy. 50. 
50 (a) Petals resembling the sepals. Ovules on 
each placenta numerous. Petals and 
stamens more or less perigynous. Leaves 
entire or toothed. Flowers regular. 
Ovary sessile. Samydaceue. 
(4) Petals sensibly different from the sepals, 
more rarely resembling them, but then 
only few ovules on each _ placenta. 
Petals and stamens hypogynous, or 
nearly so. Flowers regular. Dbizxineae. 
51 (a2) Flowersirregular. Petals open in aestiva- 
(40) tion. Ovary open at the top. Herbs. 
Leaves stipulate, alternate. Flowers 
racemose. Petals laciniate. Disc 1- 
sided. Seeds exalbuminous. Europe, 
West Asia, North Africa. Resedaceae. 
(0) Flowers regular. Petals imbricate in 
aestivation. Ovary closed. Herbs with 
exstipulate leaves, or shrubs, or trees. 
52. 
52 (a) Flowers unisexual. Leaves stipulate, al- 
ternate. Shrubs or trees. Seeds albu- 
minous. Africa, America. Biaineae. 
(4) Flowers hermaphrodite. Leaves exstipu- 
late. 53. 
