XCii NATURAL ARRANGEMENT. 



SUB-CLASS I. 



ANGIOSPERMOUS EXOGENOUS PLANTS. 



Ovules produced in a closed ovary, and fertilized by the action of 

 pollen through the medium of a stigma. Embryo with a pair of 

 opposite cotyledons. 



DIVISION I. DIALYPET'ALOUS EXOGENOUS PLANTS. 



FLORAL ENVELOPES consisting, generally, of both calyx and 

 corolla, with the Petals distinct.* 



GROUP 1. Ovaries several or numerous (in a few cases solitary), 

 distinct, when in several rows sometimes cohering in a mass, but 

 not united into a compound pistil. Petals and stamens hypogynous. 

 Seeds albuminous. 



f Stamens or pistils (one or both} numerous or indefinite. 



Herbs, without stipules. RANUNCULACEAE. p. 1. 



Shrubs or trees, with stipules. MAGNOLIACEAE. p. 8. 



Shrubs or trees, without stipules. ANONACEAE. p. 9. 



f f Stamens few or definite . Pistils few or solitary. 



Climbing plants. Flowers mono-dioicous. MENISPERMACEAE. p. 10. 



Shrubs or herbs. Flowers all perfect. BERBERIDACEAE. p. 10. 



GROUP 2. Ovaries several, either distinct, or perfectly united into 

 a compound pistil of several cells. Stamens definite or indefinite, 

 inserted on the receptacle. Embryo inclosed in a sac at the end of 

 the albumen. Aquatic herbs. 



Carpels distinct and free. CABOMBACEAE. p. 11. 

 Carpels united in a several-celled ovary. NYMPHAEACEAE. p. 12. 



GROUP 3. Ovary compound, with parietal placentae. Calyx and 

 corolla 2- 4-merous, deciduous. Stamens hypogynous. Flowers 

 unsymmetrical. Embryo small in copious albumen, or coiled when 

 there is no albumen. 



Seeds albuminous. 



Polyandrous; flower regular. PAPAVERACEAE. p. 12. 

 Diadelphous or hexandrous ; fl. irregular. FUMARIACEAE. p. 14. 



Seeds without albumen. 



Pod 2-cetted : radicle folded on tJie cotyledons. CRUCIFERAE. p. 15. 

 Pod 1-celled : embryo rolled up. CAPPARIDACEAE. p. 24. 



GROUP 4. Ovary compound, with parietal placentae. Floral envel- 

 opes mostly 5-merous ; calyx persistent. Stamens hypogynous. 

 Seeds albuminous. 



Corolla irregular: anthers introrse, connate. VIOLACEAE. p. 24. 

 Corolla regular : anthers extrorse, or innate, distinct. 



Vernation cirdnnate. Petals marcescent. DROSERACEAE. p. 27. 



* Some cases of DIALTPETALOUS FLOWERS also occur in the orders ERICACEAE, and 

 AQCIPOLIACEAE, which are placed in the GAMOPETALOUS part of the series ; and some 

 genera of several Orders placed here, are apetalous, such as Anemone, Thalictrum 

 ftc, 



