ANALYTICAL KEY. 
XXI 
Stamens 5-8 or 10 and petals hypogynous or nearly so. 
Ovary 3-celled. ..... Sapindace^e, 15 
Ovary 5-celled. . . Impatiens, &c., in Geraniace^e, 12 
Flowers regular or nearly so. 
Stamens neither just as many nor twice as many as the petals. 
Triadelphous ; petals 5 HYPERiCACEiE, 9 
Tetradynamous (or rarely only 2 or 4) petals 4 ; 
pungent herbs. CRUClFERiE, 8 
Distinct and fewer than the 4 petals. . . OleacevE. 
Distinct and more numerous than the petals. Sapindace^e, 15 
Stamens just as many or twice as many as the petals. 
Ovules and seeds only 1 or 2 in each cell. 
Herbs ; flowers monoecious or dioecious. Euphorbiaceas, 77 
Herbs; flowers perfect and symmetrical. 
Cells of the ovary as many as the sepals. Geraniace^e, 11 
Cells of the (divided) ovary twice as many 
as the styles, sepals &c. . . . LinacE/E. 
Shrubs or trees. 
Leaves 3-foliolate, pellucid-punctate. Ptelea, in RuTACEyE, 13 
Leaves palmately veined and fruit 2-winged 
or pinnate and fruit a berry. . SapindacE/E. 
Leaves pinnately veined, simple, not punctate. 
Calyx not minute; pod colored, dehiscent; 
seeds enclosed in a pulpy aril. . Celastrace^e, 13 
Calyx minute, fruit a berry-like drupe. iLiciNEiE, 13-14 
Ovules (and usually seeds) several or many in each cell. 
Stipules between the opposite and simple leaves. 
Elatinacf^e. 
Stipules between the opposite and compound leaves, 
(but they are caducous). Staphylea, in Sapindace.e. 
Stipules none where the leaves are opposite. 
Stamens 5 ; monadelphous in a 10-toothed tube or cup ; 
leaves simple, all radical. Galax, in Diapensiaceal 
Stamens 10; monadelphous at the base. Leaflets 3, 
inversely heart-shaped. Oxalis, in Geraniaceas, 12 
Stamens distinct, free from the calyx. 
Style 1, undivided. .... Ericaceae, 47 
Styles 2-5, separate. . . Caryophyllace^e, 9 
Stamens distinct, inserted on the calyx. 
Styles 2 or 3, splitting into 2 in fruit. Saxifragace^;, 22 
Style 1 ; pod in the calyx, 1-celled. . Lythrace^e. 
2. Calyx-tube adherent to the ovary , at least to its lower half. 
Tendril-bearing and often succulent herbs. . Cucurbitace^e. 
