ANALYTICAL KEY. 



The calyx and corolla together of either more or less than six parts* CLASS I 



The calyx and corolla together of 6 parts: 



Stamens 6 or less CLASS II 



Stamens 9 Eriogonum, 105 



CLASS I.— EXOGENS OR DICOTYLEDONS. 



Calyx and corolla both present. 



Petals not united (free) Division 1 



Petals more or less united (cohering) Division 2 



Corolla wanting; calyx often petaloid, sometimes wanting Division 3 



DIVISION I.— POLYPETAL^. 



A. Stamens more than 10 and more than double the number of 

 petals. 



1. HYPOGYNOUS, i. e., on the receptacle (not adhering to the sepals or petals). 

 * Pistils few to many distinct carpels, rarely one. 



Calyx deciduous, sepals 5 Ranunculatceae, 16 



Calyx caducous, sepals 2 or 3 Papaveraceae, 20 



Calyx persistent, sepals 3 or 4; aquatic plants NymphaBacese, 20 



Calyx persistent; leaves all radical RosaceaB, 49 



Calyx petaloid; corolla wanting Ranunculaceae, 16 



* * Pistil one and compound, as shown by two or more stigmas, or more than one cell in the 



ovary. 

 Petals more numerous than the sepals. 



Indefinitely numerous, slender, persistent; aquatic plants Nymphaeaceae, 20 



Just twice as many (4-6); sepals caducous Papaveraceae, 20 



Five to sixteen; sepals persistent; fleshy herbs Portulacaceae, 29 



* Maianthemum (seep. 115) has a 4-partecl perianth; 4 stamens and 2 or 3 parallel- veined leaves. 



