KEY TO THE ORDERS xix 
Anther-sacs opening at t top. 
Bixaceae in Order fier ERICALES. 864 
Placentae axile or central: gynoecium 
with a 2—several-celled ovary, (or with 
distinct eds els. 
Theaceae in Order HyPERICALES. S75 
PS io eun as united. into a disk. 
ts. 
etals. and sepals numerous: leaves with 
des: aquatic plants. 
M aaa in Order RANALES. 540 
ds and B DT fev e EA with pitcher- 
1 og p 
Sa arraceniaceae in Order SARRACENIALES. 580 
Shrubs or trees : plants not aquatic 
Clusiaceae in Order Hp pices: 865 
Sepals valvate 
Stamens with distinct filaments. 
-celled : placentae parietal. 
apparidaceae in Order PAPAVERALES. 575 
Ovary 2-several-celled : placentae Bic or central. 
Families in Order MALVALES. 840 
Stamens with united amnes rder MALVALES. 840 
PE ta n iod twice as many as the petals. 
Stam asm S the petals and ooh them. 
nthe aes nennt by hinged valve 
Po M DhyHacené in Order RANALES. 543 
Anther-sacs opening by slits 
1 rs monoecious, 
Euphorbiaceae in Order EUPHORBIALES. 1775 
Flowers perfect. 
Ovules, or seeds, several or many: embryo coiled. 
ortulacaceae in Order Bue AMEN 493 
Ovules, or seeds, solitary ; e mbryo stra 
rmeriaceae in Order BEDNUDIUES. 1020 
Stamens as many as the petals and alternate with them, or 
more, sometimes twice as many. 
Stamens 6: petals 4: sepals 2 or 4. 
Families in Order PAPAVERALES. 546 
pn M s and sepals of the same number, or sta- 
more, usually twice as many as the sepals or 
E s 
W. 1-celled. 
Ovules, or seeds, on basal or central placentae 
Herbs. Families in Order CEBNOTODIADES: 461 
Trees or shrubs. 
Stamens with free and distinct filam 
Tamaricaceae in Order HEPERI ICALES. 866 
Stamens with partially united filaments, and 
usually aped 2 LE corolla. 
St in Order EBENALES. 1036 
Ovules, or seeds, on r placeni 
Stigmas 2- cleft. 
Anther with an inconspicuous connective. 
Stigmas net brush-like. 
Droseraceae in Order SARRACENIALES. 578 
Stisinas brush. like 
a Ou. in Order H M 877 
Anther with the ee connective pro- 
duced beue the saes 
ceae in Order PASSIFLORALES. 894 
Stigmas enti d 
Stamens with ode filaments and no stami- 
Bora Families in M MALVALES. 840 
Stamens with distinct filam 
Staminodia presen 
Parnassiaceae in Order RosALEs. 589 
Staminodia anne 
Families in Order HYPERICALES. 864 
Ovary several-c 
Stamens cana to the gynoecium. 
sclepiadaceae in EE CCROEPEIGDADERS 1064 
Stamens not adnate to the gynoe 
Stamens with wholly or. partly "united filaments. 
Anthers open lengthw " 
milies in Order GERANIALES. 1743 
Anthers Beine by pores 
Polygalaceae in Order POLYGALALES. 76 
Stamens with distinct filaments. 
