22 



ANALYTICAL KEY. 



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



Ovary 3-celled Sapindace.i:, 11? 



Ovary 5 celled. . . . Impatiens, &c., in Geraniace^, 105 

 Flowers regular or nearly so. 



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



Triadelphous ; petals 5 Hypericace^, 92 



Tetradynamous (or rarely only 2 or4) ; petals 4 ; pun- 

 gent herbs. Crucifer^, 61 



Distinct and fewer than the 4 petals. . . . Oleace^, 335 

 Distinct and more numerous than the petals. . Sapindace^, 115 

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

 Ovules and seeds only 1 or 2 in each cell. 

 Herbs; flowers moncEcious or dioecious. Edphorbiace^, 451 



Herbs ; flowers perfect and symmetrical. 

 Cells of the ovary as many as the sepals, &c. Geraniace^, 102 

 Cells of the (divided) ovary twice as many as 



the styles, sepals, &c Linages, 1 01 



Shrubs or trees. 



Leaves 3-foliolate, pellucid-punctate. Ptelea, in "Rutace^, 107 

 Leaves palmately veined and fruit 2-wiuged, or 



pinnate and fruit a berry. . . . Sapindace^, 115 



Leaves pinnately veined, simple, not punctate. 

 Calyx not minute ; pod colored, dehiscent ; 



seeds enclosed in a pulpy aril. Celastrace^, 109 



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



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



Stipules between the opposite and simple leaves. Elatinace^, 91 

 Stipules between the opposite and compound leaves 



(but they are caducous). Staphylea, in Sapindace^, 118 

 Stipules none when the leaves are opposite. 



Stamens 5, monadelphous in a 10- toothed tube or cup ; 



leaves simple, all radical. Galax, in Diapensiace^, 32b 

 Stamens 10, monadelphous at the base. Leaflets 3, 



inversely heart-shaped. Oxalis, in GERAXiACEiE, 105 



Stamens distinct, free from the calyx. 



Style 1, undivided. ..... Ericace^, 309 



Styles 2-5, separate. . . . Caryophtllace^, 82 



Stamens distinct, inserted on the calyx. 



Styles2 (or3), or splitting into 2 in fruit. Saxifragace^, 168 

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



2. alijx-tube adherent to the ovary, at least to its lower half. 



Tendril-bearing and often succulent herbs. . . . Cucurbitace^, 194 

 Not tendril-bearing. 

 Ovules and seeds more than one in each cell. 



Ovary 1-celled, many-ovuled from the base. . • Portclacace^, 90 

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



Ovar}' 2 - several-celled. 



Anthers opening by pores at the apex; style 1- Melastomace.iE. 183 



