/ Corolla regular, the petals equal and similar to each other . 15 



\0orollairregular. 41 



o /Ovary inferior or adherent, below the insertion of the corolla . 51 



\0vary superior or free, within the tube or base of the corolla . 57 



Polypetah with several free, distinct ovaries or carpels. 



fStamens united in a ring or column enclosing the style. 



q l Ovaries in a ring round the axis 10 



1 Stamens free. Ovaries quite free, each with a distinct style or 

 V stigma, without a central axis 11 



Stamens 6 or 10, shortly united at the base GERANIACEJB (p. 88). 



Stamens indefinite, united in a column . MALVACEAE (p. 84). ( 



10 



II 



12 



13 



Stamens definite in number (as many, twice, or thrice as many 



as the petals) 12 



Stamens indefinite (many or rarely few) 13 



Leaves fleshy. Sepals and petals 4 or more CRASSULACE^B (p. 158). 

 Aquatic plants not fleshy. Sepals and petals 3 each. 



ALISMACE2B (p. 430). 



Leaves without stipules. Stamens inserted on the receptacle 14 

 Leaves with stipules. Stamens on the calyx ROSACES (p. 127). 

 Sepals or petals or both 4 or more , KANUNCULACE^J (p. 1). 

 Sepals and petals 3 each . . . . ALISMACE^S (p. 435). 



Jtegular Polypetah with one free, simple, or compound ovary. 



,-( More than 10 stamens 16 



10 \10 stamens or fewer 22 



( Calyx of 2 distinct sepals. Petals 4'. . PAPAVERACE.E (p. 17). 

 Calyx of one piece, with 5 or more teeth. Petals 5 or 6. 



I Stamens about 12 17 



1 Calyx of 3 to 5 sepals or lobes. Petals 5. Stamens numerous 18 

 Calyx of several sepals. Petals and stamens numerous. Aquatic 



V. plants NYMPH^BACE2E5 (p. 16). 



{Petals distinct. Ovary sessile .... LYTHRUM (p. 155). 

 Apparent petals really appendages to the involucre. Ovary ap- 

 parently stalked EUPHORBIA (p. 391). 

 Leaves opposite 19 

 Leaves alternate 20 



( Sepals 3, with or without 2 small outer ones. Style simple 

 19 J CiSTACEJB(p. 51). 



( Sepals 5, nearly equal. Styles 3 or 5, distinct. HYPERICINEJ3 (p. 79). 



f Trees or shrubs. Stamens free 21 



Herbs. Stamens free . . . . . ACTJBA (p. 14). 

 Herbs or undershrubs. Stamens united in a column round the 



pistil MALVACEAE (p. 84). 



Petals and stamens inserted on the receptacle. Flower-stalk 



winged by an oblong bract .... TlLiACE^J (p. 87), 

 Petals and stamens inserted on the calyx. Flower-stalk not 

 winged . ROSACES (p. 127). 



20, 



21 



