Stamens inserted on the receptacle.

Leaves punctate with pellucid dots. Xanthoxylum, in RUTACEae, 106

Leaves not dotted.

Calyx present, and usually colored or petal-like.

RANUNCULACEae, 34

Calyx absent; flowers entirely naked, perfect, spiked.

PIPERACEae, 446

[*][*] _Pistil one, either simple or compound._

Ovary partly inferior, the calyx coherent to its lower half, 2-celled; styles 2; stamens many. HAMAMELIDEae, 179

Ovary wholly inferior (in perfect or pistillate flowers).

Aquatic herbs; ovary 3--4-celled, or (Hippuris) 1-celled.

HALORAGEae, 180

Mostly woody plants; style or stigma one, entire; ovary 1-celled.

Stigma running down one side of the style.

Nyssa, in CORNACEae, 215

Stigma terminal, with or without a style.

Parasitic on the branches of trees; anthers sessile.

LORANTHACEae, 449

Not parasitic above ground; anthers on filaments.

SANTALACEae, 450

Ovary really free from the calyx, but permanently invested by its tube, or the base of it, so as to seem inferior.

Shrubs, with scurfy leaves; flowers mostly dicious.

ELaeAGNACEae, 448

Herbs, with the calyx colored like a corolla.

Leaves opposite, simple. NYCTAGINACEae, 425

Leaves alternate, pinnate. Poterium, in ROSACEae, 161

Ovary plainly free from the calyx, which is sometimes wanting.

Stipules (ocreae) sheathing the stem at the nodes.

Tree; calyx none; flowers moncious, in heads. PLATANACEae, 466

Herbs; calyx present and commonly petal-like. POLYGONACEae, 436

Stipules not sheathing the stem, or none.

Aquatic herbs, submerged or nearly so.

Leaves whorled and dissected; style single.

CERATOPHYLLACEae, 488

Leaves opposite, entire; styles 2; ovary 4-celled.

HALORAGEae, 180

Not aquatics, herbs.

Ovary 10-celled; berry 10-seeded. PHYTOLACCACEae, 436

Ovary 3- (rarely 1--2-) celled; juice usually milky.

EUPHORBIACEae, 451

Ovary 1-celled; juice not milky.

Style, if any, and stigma only one; leaves simple; no scarious bracts around the flowers. URTICACEae, 461

Styles 3; embryo straight; flowers involucrate.

Eriogonum, in POLYGONACEae, 436

Style or stigmas 2 or 3; embryo coiled or curved.

Stipules not scarious, leaves palmately cleft or palmately compound. Cannabineae, in URTICACEae, 461

Stipules scarious (or none); leaves opposite.

ILLECEBRACEae, 426

Stipules none; but flowers with scarious bracts.

AMARANTACEae, 427

Stipules and scarious bracts none. CHENOPODIACEae, 430

Shrubs or trees.

Ovules a pair in each cell of the ovary.

Fruit 2-celled, a double samara. Acerineae, in SAPINDACEae, 115

Fruit a 1-celled and 1-seeded samara or a drupe.

OLEACEae, 335

Ovules single in each cell of the