ANALYTIC KEY TO NATURAL ORDERS. 



SUBCLASS I. EXOGENS. 



Leaves netted- veined. Parts of the flower seldom in threes or sixes. 

 Cotyledons two. Wood of woody species showing concentric circles. 



DIVISION I. CHOBIPETAL.E HYPOGYN.E. 



Petals when present distinct, at least at base. Stamens hypogynous. 



A. Stamens more than 10, and more than twice as many as 



the sepals or petals. 



Pistils distinct, simple, becoming achenes or PAQE 



follicles (in one a berry) KANUNCULACE^E 2 



Pistils compound, i. e., the cells, placentae or 



stigmas more than one. 

 Petals outnumbering the sepals, 



Twice as many (46); sepals caducous.. .PAP A VERACE.E 8 

 " " " (816); sepals persist- 

 ent Lewisia in POBTULACE^J 58 



Sepals and petals concave, intergrading, 



persistent. Plants aquatic NYMPH^E^; 8 



Sepals (or calyx-lobes) and petals 5 each; 

 Calyx valvate in bud; stamens mona- 



delphous MALVACEAE 63 



Calyx imbricate; stamens in indistinct 



bundles HYPERICE^E ' 62 



Sepals very unequal; stamens neither 



united nor fascicled. . CISTOIDE^E 28 



Petals lacerate or palmatifid; ovary . open 



before maturity BESEDACE^ 27 



B. Stamens 10 or fewer, not more tlian twice as many as the 



petals or sepals. 



* Pistils more than one, distinct. 



Sepals, petals and pistils equal in number; 



leaves fleshy CRASSULACE.E 126 



Pistils outnumbering petals or stamens RANUNCULAOE.E 2 



