INTRODUCTION. 



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



'\Corolla irregular .......... 41 



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



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



Pdypetals 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 



II 



12 



13 



Stamens 5 or 10, shortly united at the base GERANIACB^B (p. 88). 

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

 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 CRASSULACEJS (p. 158). 

 Aquatic plants not fleshy. Sepals and petals 3 each. 



ALISMACE^J (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 . RANUNCULACEJE (p. 1). 

 Sepals and petals 3 each .... ALISMACEJB (p. 435). 



Regular Poll/petals with one free, simple, or compound ovary. 



..-/More than 10 stamens 16 



10 \10stamens 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. 



-J Stamens about 12 17 



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

 I Calyx of several sepals. Petals and stamens numerous. Aquatic 

 t plants NYMPH JSACE^E (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-^ CISTACEJS (p. 51 ). 



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



/"Trees or shrubs. Stamens free 21 



20 J Herbs. Stamens free ACT^A (p. 14). 



I Herbs or undershrubs. Stamens united in a column round the 



[ pistil MALVACEAE (p. 84). 



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

 a . I winged by an oblong bract .... TILIACE^E (p. 87). 

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

 . I winged . ROSACE JB (p. 127). 



