62 KEY TO PLANTS. 
rarely of the same number or fewer, and 
then 5. 26. 
26 (a) Petals 4. Stamens 6, four of them longer 
than the two others. - Flowers regular 
or nearly so. Leaves exstipulate. Herbs 
or undershrubs. Sepals 4, distinct. Petals 
imbricate. Stamens hypogynous. 
Cruciferae. 
(2) Petals 5 or 1-3, rarely 4; in the latter case 
stamens 8-10. Flowers distinctly irregu- 
lar, more rarely regular or nearly so, 
but then leaves stipulate or shrubs or 
trees. Leguminosae. 
27 (a) Petals 4. 28. 
(0) Petals 5. 29. 
28 (a) Stamens 6, four of them longer than the 
two others. Flowers regular. Ovary 
sessile. Herbs or undershrubs. Flowers 
racemose. Sepals and petals imbricate 
in bud. Stamens hypogynous.  Pla- 
centas 2. Fruit dry and indehiscent, or 
dehiscing in two valves. Cruciferae. 
(5) Stamens 4-10, equal, or nearly equal, in 
length. Flowers usually irregular. 
Ovary usually stipitate. Stamens hypo- 
gynous. Fruit baccate or debiscing in 
two valves. Capparideae. 
