lxiv INTRODUCTION, 
Pala regular, the petals equal and similar to each other , . 15 
Corolla irregular : ; . Al 
f Ovary inferior or adherent, below the insertion of the corolla . 51 
Ovary superior or free, within the tube or base of the corolla oy 
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 
) Stamens free. Ovaries quite free, each with a distinct style or 
| stigma, without a central axis 
19 J Stamens 6 or 10, shortly united at the base .  GpRANIACER (p. 88.) 
(Stamens indefinite, united in a column : . MALVACEZ (p. 84.) 
Stamens definite in number (as many, twice, or thrice as many as 
the petals) : ; : , . 12 
vga: indefinite (many or rarely few) ° . 13 
f Leaves fleshy. Sepals and petals 4 or more Cissy eta (p. 158.) 
12, Aquatic plants not fleshy. Sepals and petals 3 each. 
ALISMACEE (p. 429.) 
13/ Leaves without stipules. Stamens inserted on the receptacle . 14 
\ Leaves with stipules. Stamens on the calyx RosacE# (p. 127.) 
14 Sepals or petals or both 4 or more .  « RANUNCULACEA (p. 1.) 
| Sepals and petals 3 each ; . ¢ ° ALISMACE& (p. 429.) 
Regular Polypetals with one free, simple, or compound ovary. 
15! More than 10 stamens . ° - : : : ° : - Db 
, 10 stamens or fewer. ‘ : : ‘ . 22 
Calyx of 2 distinct sepals. Petals4  . PAPAVERACE® (pi Ds} 
Calyx of one piece, with 5 or more teeth. Petals 5 or 6. Stamens 
ig). sboutl2 . : eS 
Calyx of 3 to 5 sepals or lobes. Petals 5. Stamens numerous . 6 
Calyx of several sepals. Petals and stamens numerous. Aquatic 
plants ’ ° A . NYMPHHACES (p. 16.) 
Sais distinct. Ov ary ‘sessile 4 LYTHRUM (p. 156.) 
17< Apparent petals really appeals to the involucre. Ovar y ap- 
d ‘parently stalked =. . .  .  EvpHorsra 4 (p. 391.) 
18. f Leaves opposite . : ; ; ° ; ; » gaa 
\ Leaves alternate . > ae 
| Sepals 3, with or without two small outer ones. Sty le simple. 
to: CISTACEE (p. 51.) 
| Sepals 5, nearly equal. Styles 3 or 5, distinct. HYPERICINEZ (p. 79.) 
‘Trees or shrubs. Stamens free . 5 : : ~ ae 
sal Herbs. Stamens free . , “AcTHA (p. 14.) 
Herbs or undershrubs. Stamens united in a column round the 
pistil : : . MALVACEZ (p. 84.) 
Petals and stamens inser ted on the receptacle. Flower-stalk 
9 J winged by an oblong bract ; . TILIACER (p. 87.) 
1 Petals and’ stamens inserted on the “calyx. Flower-stalk not 
| winged . 0. . ou) wl veo 2 eee 
