24 ANALYTICAL KEY. 



Ovary 2 - several-celled. 

 Flowers irregular. 

 Anthers opening at the top, 



Six or eight and 1-celled : ovary 2-celled. . . POLYGALACE.S:, 120 

 Ten and 2-celled : ovary 5-celled. . . Rhodora, in ERICACEAE, 286 

 Anthers opening lengthwise. 



Stamens 12 and petals 6 on the throat of a tubu- 

 lar inflated or gibbous calyx. Cuphea, in LTTHRACE^E, 182 

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



Ovary 3-celled. SAPINDACEJE, 116 



Ovary 5-celled. . . . Impatiens, &c. in GERANIACE^E, 105 

 Flowers regular or nearly so. 



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



Triadelphous : petals 5 HYPERICACE^J, 83 



Tetradynamous (or rarely only 2 or 4) : petals 4: 



pungent herbs CRUCIFER^;, 62 



Distinct and fewer than the 4 petals. . . . OLEACEJE, 400 

 Distinct and more numerous than the petals. . SAPINDACE^, 116 

 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. ETJPHORBIACE.SJ, 430 



Herbs : flowers perfect and symmetrical. 



Cells of the ovary as many as the sepals, &c. GERANIACE^S, 105 

 Cells of the ovary (divided) twice as many as 



the styles, sepals, &c LINAGES, 104 



Shrubs or trees. 



Leaves 3-foliolate, pellucid-punctate. Ptelea, in RUTACE^EJ, 109 

 Leaves palmately veined : fruit 2-winged. SAPINDACE^E, 116 



Leaves pinnately veined, simple, not punctate. 

 Calyx not minute : pod colored, dehiscent : 



seeds enclosed in a pulpy ariL CELASTRACEJE, 1 15 



Calyx minute : fruit a berry-like drupe. AQUIFOLIACE^E, 305 

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



Stipules between the opposite and simple leaves. ELATINACE.E, 86 

 Stipules between the opposite and compound leaves 



(but they are caducous). Staphylea, in SAPINDACE^J, 116 

 Stipules none when the leaves are opposite. 

 Stamens 5, monadelphous in a 10-toothed tube 



or cup : leaves simple, all radical. GALACINE^, 305 



Stamens 10, monadelphous at the base. Leaf- 

 lets 3, inversely heart-shaped. Oxalis in GERANIACE.E, 105 

 Stamens distinct, free from the calyx. 



Style 1, undivided. ERICACEAE, 286 



Styles 2-5, separate. . . . CARYOPHYLLACE^E, 87 

 Stamens distinct, inserted on the calyx. 



Styles 2 (or 3), or splitting into 2 in fruit. SAXIFRAGACEJB, 163 

 Style 1 : pod in the calyx, 1-celled at maturity. LYTHRACE^J, 182 



