36 KEY TO PLANTS. 
anth-segments imbricate in aestivation. 
Leaves undivided, stipulate. Stamens 
nearly always distinctly perigynous. 
Ovules almost invariably ascending. 
Tropics and Australia. Rosaceae. 
(0) Style terminal or nearly so. Stamens 
8-10, rarely more, but then perianth- 
segments valvate in aestivation. Leaves 
pinnate, very rarely reduced to phyllodes, 
Stamens usually hypogynous or nearly 
so. Ovules descending. Leguminosae. 
44 (a) Ovules attached to a sutural placenta 
(ue, to the ventral suture of the 
ovary). 45. 
(0) Ovules attached to several parietal placen- 
tas or to a basal or central placenta.* 
Flowers hermaphrodite, rarely dicecious ; 
in the latter case perianth-leaves 3-8, 
distinct. 46. 
45 (a) Stamens destitute of filaments, inserted 
in the concave lamina of the perianth- 
segments, 4. Perianth-segments 4, 
* Compare Salicineae with stipulate leaves and dicecious 
flowers with a disc (or perianth) in the form of a cup or 
reduced to 1-2 scales, and Balanopseae with exstipulate 
leaves and dicecious flowers with 1 bract in the male and 
many bracts (or perianth-leaves) in the female flowers. 
