DIALYPETALOUS EXOGENOUS PLANTS. XCV 



axis. Calyx either free or adherent to the ovary. Petals and 

 stamens inserted on. the calyx. Seeds albuminous, numerous. 



Pistils as many as the. sepals. CRASSULACEAE.JP. 95. 

 Pistils fewer than the sepals, more or less united. SAXIFRAGACEAE. p. 95. 



GROUP 18. Ovary compound, 2- (rarely 3- or 5-) celled, with a 

 single ovule suspended from the apex of each cell. Stamens usually 

 as many as the petals, or lobes of the adherent calyx: Embryo 

 small, in hard albumen. 



^Summit of the ovary free from the calyx; petals and stamens inserted on tJie 

 throat of the calyx. HAMAMELACEAE. p. 97. 



f f Calyx-tube entirely adherent to the. ovary. Stamens and petals epigynous. 

 Flowers mostly umbellate. 



Fruit separable into 2 dry carpels. UMBELLIFERAE. p. 98. 



Fruit drupaceous, usually of more than 2 carpels. ARALIACEAE. p. 108. 



Flowers cymote, or capitate. Drupe 2rcetted. CORNACEAE. p. 110. 



DIVISION II. GAMOPET'ALOUS EXOGENOUS PLANTS. 

 FLORAL ENVELOPES consisting of both calyx and corolla, the 

 petals more or less united.* 



GROUP 1. Ovary adherent to the calyx, 2- to several-celled, with 1 

 or many ovules in each cell. Stamens inserted on the corolla. 

 Seeds albuminous ; embryo small. 



Stipules wanting. GAPRIFOLIACEAE. p. 112. 



Stipules interpeliolar. RUBIACF.AE. p. 116. 



GROUP 2, Ovary adherent to the calyx, 1-celled and 1 ovuled, 

 rarely 3-celled with 2 of the cells empty. Seeds with little or no 

 albumen. Stamens inserted on the corolla. Calyx-limb a mere 

 ring, crown, or pappus or obsolete. Fruit akene-like. 



Stamens distinct. Seed suspended. 



Stamens 3, or fewer. VALERIANACEAE. p. 120. 



Stamens 4. Heads involucrate. DIPSACEAE. p. 120. 



Stamens syngenesious. Seed erect. COMPOSITAE. p. 121. 



GROUP 3. Ovary adherent to the calyx, with 2 or more cells and 

 numerous ovules. Seeds albuminous. Stamens inserted with the 

 corolla (epigynous) : anthers not opening by pores. 



Corolla irregular. Stamens united in a tube. LOBELIACEAE. p. 162. 

 Corolla regular. Stamens distinct. CAMPANULACEAK. p. 164. 



GROUP 4. Ovary sometimes adherent to the calyx, more commonly 

 free, with 2 or more cells and numerous ovules. Seeds albuminous. 

 Stamens inserted with the corolla, or rarely adherent to its base, 

 as many, or twice as many, as its lobes : anthers mostly opening by 

 pores. 



*The plants belonging to ORD. XL. CCCURBITACEAE, althougb often gamopeta- 

 lous, will be found in the dialypetalous division : and our native species of Fraxi- 

 nus, belonging to ORD. LXXIV. OLEACEAE, at the end of this division, are 

 destitute of petals. 



