KEY TO THE ORDERS ix 
Stipules scarious or hyaline: inflorescence cymose: leaf-blades pin- 
nately veined. Families in Order CHENOPODIALES. 383 
tt Leaves without stipules. 
Stigmas entire. Order CHENOPODIALES. 383 
Stigmas 2-cleft. Euphorbiaceae in Order EUPHORBIALES. 690 
** Ovary several-celled, or with several placentae, several-ovuled. 
Stamens hypogynous, inserted under the gynoecium in the perfect flowers, not 
on a disk in the pistillate flowers. 
Herbs. 
Flowers perfect. 
Ovary several-celled. 
Fruit baccate or nut-like, or a circumscissile capsule, the carpels 
.terminalonthereceptacle. Families in Order CHENOPODIALES. 383 
Fruit of several carpels, lateral on the receptacle, each carpel cir- 
cumscissile. Penthoraceae in Order ROSALES. 494 
Ovary 1-2-celled. 
Stamens not tetradynamous, 4-8: ovary 1-celled. 
Order CHENOPODIALES. 383 
Stamens tetradynamous: ovary 2-celled. 
Brassicaceae in Order PAPAVERALES, 460 
Flowers monoecious or dioecious. 
Ovules with the raphe towards the axis of the gynoecium. 
: Euphorbiaceae in Order EUPHORBIALES. 690 
Ovules with the raphe away from the axis of the gynoecium. 
Buxaceae in Order SAPINDALES. 723 
Trees or shrubs. 
Gynoecium 5-carpellary, the carpels nearly distinet. 
: Buettneriaceae in Order MALVALEs. 759 
Gynoecium 2-4-carpellary, the carpels united. 
Ovary 4-celled: fleshy maritime shrubs. 
Batidaceae in Order CHENOPODIALES. 383 
Ovary 2-celled: plants not fleshy. Oleaceae in Order OLEALES. 916 
Ranier peru none or epigynous, inserted on the?margin of a hypanthium or 
a disk. 
Fruit a samara. Families in Order SAPINDALEs. 723 
Fruit not a samara. 
Fruit drupe-like or berry-like: shrubs or trees. Order RHAMNALES. 747 
Fruit a capsule; herbs. Order ARISTOLOCHIALES. 1130 
b. Ovary inferior. 
Flowers not in involucrate heads. 
Fruit 3-winged, splitting into 3 nutlets. Gouania in Order RRHAMNALES. 747 
Fruit neither 3-winged nor splitting into carpels. 
Fruit a berry or a drupe, or nut-like. 
Calyx deciduous as a lid : stamens numerous. 
Chytraculia in Order MYRTALES. 822 
Calyx of valvate or imbricated sepals: stamens few. 
Stamens as many,as the perianth-members and alternate with them, or 
fewer. 
Herbs, with succulent stems and leaves, or woody below: flowers 
perfect. Tetragoniaceae in Order CHENOPODIALES. 
Trees or shrubs : flowers dioecious. Nyssaceae in Order AMMIALES. 851 
Stamens as many as the perianth-members and opposite them, or twice 
as many. 
Styles present. 
Ovules mostly on basal placentae, sometimes pendulous: cotyle- 
dons not convolute : tree or root-parasites. Order SANTALALES. 1101 
Ovules not on basal placentae: cotyledons convolute: not parasitic 
plants. Families in Order MYRTALES. 822 
Styles wanting: stigmas sessile. Gunneraceae in Order MYRTALES. 822 
Fruit a capsule. 
Sepals as many as the ovary-cavities or one-half as many. 
Calyx regular and the sepals half as many as the cavities in the ovary, 
or regalar. | ii a M oe 1130 
Calyx regular and the sepals as many as the cavities in the ovary. 
p " ^ : Order MYRTALES. 822 
Sepals (4-5) at least twice as many as the ovary-cavities (2). 
—7 : Baxitragacene in Order ROSALES. 494 
Flowers, at least the staminate, in involucrate heads. 
Ambrosiaceae in Order CARDUALES. 1148 
B. Corolla present. 
* Petals distinct, at least at the base. 
Carpels solitary, or several and distinct, or united only at the base. 
Stamens at the base of the receptacle, i. e., hypogynous. 
Flowers in monoecious heads. Platanaceae in Order ROSALES. 4194 
Flowers not in monoecious heads. 
Plants with relatively firm stems and leaves, not succulent. Order RANALES. 428 
Plants with suceulent stems and leaves. Sedaceae in Order RosALES. 494 
Stamens on the margin of a hypanthium (the hypanthium very small in some Saxifra- 
gaceae). 
Plants without secreting glands in tlie bark. Order ROSALES. 494 
Plants with een | glands in the bark. Surianaceae in Order GERANIALES. 658 
Carpels several and united. 
+ Ovary superior 
t Stamens inserted at the base of the ovary or receptacle. 
à Stamens numerous. : 
peo de eun Order PAPAVERALES. 460 
