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. CHOBIPETALiE HYPOGYNiE. 



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 page 



follicles (in one a berry) Ranoncui*ace,e 2 



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

 stigmas more than one. 

 Petals outnumbering the sepals, 



Twice asmany (4— 6); sepals caducous... Pap averace.e 8 

 " " " (8 — 16); sepals persist- 

 ent Lewisia in Pobtulace^e 58 



Sepals and petals concave, intergrading, 



persistent. Plants aquatic Nymph^e^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* 62 



Sepals very unequal ; stamens neither 



united nor fascicled Cistoide/e 28 



Petals lacerate or palmatifld; ovary open 



before maturity. . .. Resedaoe^e 27 



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



petals or sepals. 



* Pistils more than one, distinct. 



Sepals, petals and pistils equal in number; 



leaves fleshy Crassdlace^; 126 



Pistils outnumbering petals or stamens Ranunculace/E 2 



