Ovary sessile. SAXIFRAGACEae, 168

Ovary 2--several-celled.

Flowers irregular.

Anthers opening at the top,

Six or eight and 1-celled; ovary 2-celled, 2-ovuled.

POLYGALACEae, 120

Ten and 2-celled; ovary 5-celled.

Rhododendron, in ERICACEae, 286

Anthers opening lengthwise.

Stamens 12 and petals 6 on the throat of a tubular inflated or gibbous calyx. Cuphea, in LYTHRACEae, 186

Stamens 5--8 or 10, and petals hypogynous, or nearly so.

Ovary 3-celled. SAPINDACEae, 115

Ovary 5-celled. Impatiens, &c., in GERANIACEae, 105

Flowers regular or nearly so.

Stamens neither just as many nor twice as many as the petals,

Triadelphous; petals 5. HYPERICACEae, 92

Tetradynamous (or rarely only 2 or 4); petals 4; pungent herbs. CRUCIFERae, 61

Distinct and fewer than the 4 petals. OLEACEae, 335

Distinct and more numerous than the petals. SAPINDACEae, 115

Stamens just as many or twice as many as the petals.

Ovules and seeds only 1 or 2 in each cell.

Herbs; flowers moncious or dicious. EUPHORBIACEae, 451

Herbs; flowers perfect and symmetrical.

Cells of the ovary as many as the sepals, &c.

GERANIACEae, 102

Cells of the (divided) ovary twice as many as the styles, sepals, &c. LINACEae, 101

Shrubs or trees.

Leaves 3-foliolate, pellucid-punctate.

Ptelea, in RUTACEae, 107

Leaves palmately veined and fruit 2-winged, or pinnate and fruit a berry. SAPINDACEae, 115

Leaves pinnately veined, simple, not punctate.

Calyx not minute; pod colored, dehiscent; seeds enclosed in a pulpy aril. CELASTRACEae, 109

Calyx minute; fruit a berry-like drupe. ILICINEae, 107

Ovules (and usually seeds) several or many in each cell.

Stipules between the opposite and simple leaves.

ELATINACEae, 91

Stipules between the opposite and compound leaves (but they are caducous). Staphylea, in SAPINDACEae, 118

Stipules none when the leaves are opposite.

Stamens 5, monadelphous in a 10-toothed tube or cup; leaves simple, all radical. Galax, in DIAPENSIACEae, 326

Stamens 10, monadelphous at the base. Leaflets 3, inversely heart-shaped. Oxalis, in GERANIACEae, 105

Stamens distinct, free from the calyx.

Style 1, undivided. ERICACEae, 303

Styles 2--5, separate. CARYOPHYLLACEae, 82

Stamens distinct, inserted on the calyx.

Styles 2 (or 3), or splitting into 2 in fruit.

SAXIFRAGACEae, 168

Style 1; pod in the calyx, 1-celled. LYTHRACEae, 184

[2.] _Calyx-tube adherent to the ovary, at least to its lower half._

Tendril-bearing and often succulent herbs. CUCURBITACEae, 194

Not tendril-bearing.

Ovules and seeds more than one in each cell.

Ovary 1-celled, many-ovuled from the base. PORTULACACEae, 90

Ovary 1-celled, with 2 or 3 parietal placentae. SAXIFRAGACEae, 168