xx ii ANALYTICAL KEY. 



Sterile filaments or some appendages resem- 

 bling them before each veiny petal. 48 ParnassiacEjE 

 No sterile filaments : style 1 or none. 45 Cistace/E. 



Beset with strong bristles tipped with a clam- 

 my gland : styles divided so as to be 

 twice as many as the 3 - 5 placenta. 47 Drosekace^e. 



Ovary 2 - several-celled. 

 Flowers irregular. 



Stamens diadelphous or monadelphous, 



Six or eight, connected with the corolla : anthers 



one-celled, opening at the top. ... 85 PoL^GALACEiE. 

 Ten, free from the corolla: anthers 2-celled. (As- 

 tragalus, &c.) 88 Lbgitmikos*. 



Stamens 5, the anthers somewhat monadelphous or 



united over the stigma 73 (40) Balsamxnace.e. 



Stamens distinct both as to the filaments and the anthers. 



Anthers opening at the apex. . Rhodora, 245 Ericace.e. 



Anthers opening lengthwise. 



Calyx spurlcss. . . • '. ■ • 82 (41) Sapindacb^b. 

 Calyx with a spur (except Cuphea, p. 127). (40) TropjeolacejE. 



Flowers regular or nearly so. 



Stamens (2 or 3) fewer than the 4 petals. . . . 356 (72) Oleace.e. 

 Stamens more numerous than the petals, but not twice as many, 



Triadelphous : leaves opposite 48 Hypericace^:. 



Distinct, usually 6 or 8, of equal length. . . 84 (41) Sapindaceje. 

 Tetradynamous, i. e. 2 short and 4 long : petals 4. 28 (33) Crtjcifer^;. 

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

 Ovules and seeds only 1 or 2 in each cell. 



Herbs : flowers monoecious : styles fewer than the 



sepals, mostly 3 385 Euphorbiaceje. 



Herbs : styles or stigmas as many as the petals or sepals. 



Sepals, petals, and lobes of the ovary 3 : stamens 6. 74 Limnanthaceje. 

 Sepals and petals 5 : ovary and pod 10-celled. 70 (38) Linace*:. 



Sepals, petals, and cells or lobes of the ovary 5 : 



stamens 5-10 72 (38) Geraniace.e. 



Shrubs or trees. 



Leaves palmately veined and lobed : fruit two- 

 winged, a double samara. . . Acer, 84 (41) SapindacejE. 

 Leaves pinnately veined, not lobed. 



Calyx not minute : pod colored, dehiscent : 



seeds enclosed in a pulpy aril. . . 81 Celastrace^e. 

 Calyx minute : stigmas sessile : fruit a berry- 

 like drupe 263 Aquifoliace*:. 



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



Stipules between the opposite-and simple leaves. 52 Elatinace^e 



