KEY TO FAMILIES XXlll 



Anthers not dehiscing by valves. 



Flowers hermaphrodite. 



Leaves simple. 



Leaves opposite. 



Parasitic plants : 11. 



Plants not parasites. 



Perianth petaloid (involucre simulating a calyx) with basal 



portion enclosing and adhering to fruit : 17 (Mirahilis). 



Sepals 2. Fruit a capsule : 20. 



Sepals 5. Fruit a capsule : 22. 



Calyx 4-lobed. Fruit 4 follicles : 34. 



Leaves alternate. 



Aquatic plants with peltate leaves : 23. 



Leaves lobed (in Cruciferx sometimes simulating a compound 

 leaf). 



Stamens numerous. 



Fruit a head of achenes : 25. 



Fruit a capsule : 30. 



Stamens 6, tetradynamous : 32. 



Leaves entire. 



Fruit a drupe. 



Leaves without stipules : 10. 



Leaves with stipules : 37. 



Fruit not drupaceous. 



Stipules ochreate : 14 (Eumex). 



Stipules not ochreate. 



Calyx-segments 5, enlarged in fruit : 18 {Stegnospcrma). 



Sepals 2. Fruit a capsule : 20. 



Sepals 2. Fruit a utricle enclosed in the perianth : 21. 



Sepals 3 : 27. 



Sepals 4 : 31. 



Leaves compound. 



Leaves digitate. 



Sepals 4 : 31. 



Sepals 7 or 8 : 33. 



Leaves pinnate. 



Rhachis winged : 36. 



Rhachis not winged. 



Leaves 2-3 pinnate : 33a. 



Leaves simply pinnate. 



Fruit a head of achenes : 25. 



Fruit 4 follicles : 34. 



Fruit-achenes on or enclosed in the receptacle : 37. 



Fruit a solitary follicle : 38. 



Flowers unisexual. 



Parasitic shrubs : 11. 



Plants not parasites. 



Leaves simple : 2G. 



Leaves compound : 30. 



