24 ANALYTICAL KEY. 



Ovary 2 - several-celled. 

 Flowers irregular. 

 Anthers opening at the top, 



Six or eight and 1-celled : ovary 2-celled. . . Polygalace.e, 120 

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

 Anthers opening lengthwise. 



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

 lar inflated or gibbous calyx. Cuphea, in Lythrace.e, 182 

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



Ovary 3-celled Sapindace^e, 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^e, 83 



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



pungent herbs Crucifer^, 62 



Distinct and fewer than the 4 petals. . . . Oleace^e, 400 

 Distinct and more numerous than the petals. . Sapindace^e, 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. Euphorbiace^e, 430 



Herbs: flowers perfect and symmetrical. 

 Cells of the ovary as many as the sepals, &c. Geraniace^e, 105 

 Cells of the ovary (divided) twice as many as 



the styles, sepals, &c Linaceje, 104 



Shrubs or trees. 

 Leaves 3-foliolate, pellucid-punctate. Ptelea, in Rtttace.e, 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. Celastrace^e, 115 



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^e, 116 

 Stipules none when the leaves are opposite. 

 Stamens 5, monadelphous in a 10-toothed tube 



or cup : leaves simple, all radical. GALACiNEiE, 395 



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. Ericaceje, 286 



Styles 2-5, separate. . . . Caryophyllace^e, 87 



Stamens distinct, inserted on the calyx. 

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

 Style 1 : pod in the calyx, 1-celled at maturity. Lythrace/E, 182 



