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^S. 



Beset with strong bristles tipped with a clam- 

 my gland : styles divided so as to be 

 twice as many as the 3-5 placentae. 47 DROSERACE.SS. 



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 POLYGALACE^E. 

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

 tragalus, &c.) 88 LEGUMINOS^:. 



Stamens 5, the anthers somewhat monadelphous or 



united over the stigma 73 (40) BALSAMINACE^B. 



Stamens distinct both as to the filaments and the anthers. 

 Anthers opening at the apex. . Rhodora, 245 ERICACEAE. 



Anthers opening lengthwise. 



Calyx spurless 82 (41) SAPINDACE^J. 



Calyx with a spur (40) TROP^OLACE^E. 



Flowers regular or nearly so. 



Stamens (2 or 3) fewer than the 4 petals. . . . 356 (72) OLEACE^B. 

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



Triadelphous : leaves opposite 48 HYPERICACE^B. 



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

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

 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 EUPHORBIACE.SS. 



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



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

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



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) SAPINDACBJB. 

 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^S. 



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



Stipules between the opposite and simple leaves. 52 ELATIXACE.S:. 



