ANALYTICAL KEY TO THE ORDERS. 



SEMES I. PH^ENOGAMIA OR FLOWERING PLANTS. Those 

 with flowers and seeds. 



CLASS I. ANGIOSPERMJ3. Pistil a closed ovary containing the 



ovules. 



SUBCLASS I. DICOTYLEDONS. Embryo with two cotyledons. 

 Leaves netted- veined. Flowers usually 4 or 5-rnerous. 



DIVISION I. POLYPETAL^E. Calyx and corolla both present: the 

 latter of separate petals. 



A. Stamens numerous, at least more than 10, and more than twice the petals. 

 1. Stamens on the receptacle, free from the ovary and calyx. 



Pistils few to many distinct carpels RANUNCULACE^E, 1 



Pistil compound : cells, placenta, or stigmas more than one. 

 Petals more numerous than sepals, 



Very numerous, small and persistent : aquatic. . . NYMPH^ACE^S, 3 

 Twice as many (4 or 6), and both usually caducous. PAPAVERACE.E, 4 

 Five to sixteen : sepals persistent. . . . PORTULACACE^E, 12 



Petals same number as sepals, 



Four, and both deciduous. CAPPARIDACEJE, 7 



Five, and the calyx persistent. 



Sepals valvate in the bud: stamens monadelphous. MALVACEAE, 15 

 Sepals imbricated in the bud : leaves entire and 



pellucid-punctate. HYPERICACEJE, 14 



2. Stamens on the ( free or adnate) calijx. 



Leafless mostly prickly fleshy plants : ovary 1 -celled. . . CACTACE^E, 34 



Leafy fleshy plants : ovary 3 or more-celled. . . . FICOIDEJE, 35 



Leafy fleshy herbs : ovary 1 -celled PORTULACACE^E, 12 



Not fleshy. 



Leaves opposite, simple : sepals and petals 4 or 5. . SAXIFRAGACEJE, 27 



Leaves alternate, with stipules ROSACES, 26 



Leaves alternate, without stipules, rough. . . . LOASACE^, 32 



