u{ 



lxiv INTRODUCTION. 



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



\ Corolla irregular 41 



8 f Ovary inferior or adherent, below the insertion of the corolla . 51 



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



Polypetals with several free, distinct ovaries or carpels. 



{Stamens united in a ring or column enclosing the style. 

 Ovaries in a ring round the axis 10 

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

 stigma, without a central axis 11 



10 /Stamens 5 or 10, shortly united at the base Geraniace^e (p. 88). 

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

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



Il-[ as the petals) . .12 



Stamens indefinite (many or rarely few) 13 



Leaves fleshy. Sepals and petals 4 or more CrassulACEj: (p. 158). 

 12-J Aquatic plants not fleshy. Sepals and petals 3 each. 



Alismace^s (p. 430). 

 .o /Leaves without stipules. Stamens inserted on the receptacle 14 

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

 "Sepals or petals or both 4 or more . Kanunculace^e (p. 1). 



Sepals and petals 3 each .... Alismace^j (p. 435). 



Regular Polypetals with one free, simple, or compound ovary. 



..k /More than 10 stamens 16 



\X0 stamens or fewer 22 



f Calyx of 2 distinct sepals. Petals 4 . . Papaverace^e (p. 17). 

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



- fi J 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 



, plants NYMPH.33ACE.a3 (p. 16). 



f Petals distinct. Ovary sessile .... Lythrum (p. 155). 



17-^ Apparent petals really appendages to the involucre. Ovary ap- 

 [ parently stalked Euphorbia (p. 391). 



1£ /Leaves opposite 19 



\ Leaves alternate 20 



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



19-^ Gestagen (p. 51). 



( Sepals 5, nearly equal. Styles 3 or 5, distinct. Hypericine.33 (p. 79). 



{Trees or shrubs. Stamens free 21 

 Herbs, Stamens free Actjea (p. 14). 

 Herbs or undershrubs. Stamens united in a column round the 

 pistil Malvace^j (p. 84). 



(Petals and stamens inserted on the receptacle. Flower-stalk 

 winged by an oblong bract .... Tiliacejs (p. 87). 

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

 winged . Rosacea (p. 127). 



