SYNOPTICAL 

 FLORA OF NOHTH AMERICA. 



Division II. GAMOPETALOUS DICOTYLEDONOUS PLANTS. 



Perianth consisting of both calyx and corolla, the latter more or 

 loss gamopetalous. (Exceptions : A part of Ericacece, PlumbaginaceoR^ 

 Styracacece, and OUaceoe have unconnected petals ; some Oleacece., &c., 

 are apetalous.) 



General Key to the Orders. 



* Ovary inferior or mainly so : stamens borne by the corolla, alternate with 

 its lobes, and 



•)— Unconnected : leaves opposite or whorl ed. 



69. CAPRIFOLIACEiE. Stamens as many as corolla-lobes (one fewer in Linnma, 

 doubled by division in Adoxci). Seeds albuminous. Leaves opposite : stipules none, 

 or rare as appendages to base of petiole. 



70. RUBIACEiE. Stamens as many as corolla-lobes, mostly four or five. Ovary with 

 two or more cells or placentae. Seeds albuminous. Leaves all sinn^le and entire, 

 with stipules between or within the petioles or bases, or whorled without stipules, 

 the additional leaves probably representing them. 



71. VALERIANACEiE. Stamens fewer than corolla-lobes, one to four. Ovary with 

 one cell containing a suspended ovule which becomes an exalbuminous seed, and 

 commonly two empty cells or vestiges of them. No stipules. 



72. DIPSACACE^. Stamens as many as or fewer than corolla-lobes, two or four. 

 Ovary simple and one-celled, with a single suspended ovule, becoming an albuminous 

 seed. Flowers capitate. Corolla-lobes imbricated in the bud. 



■J- H- Stamens with anthers connate into a tube. 



73. COMPOSITE. Syngenesious stamens as many as their corolla-lobes, five, some- 

 times four. Ovary one-celled, with a solitary erect ovule, becoming an exalbuminous 

 seed in an akene. Lobes of the corolla valvate in the bud. Flowers in involucrate 

 heads. No stipules. 



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