GAMOPETAL^. KEY TO THE OEDEES. 65 



(13) Flowers regular. (14). 

 Flowers irregalar. (37). 



(14) Stamens hypogynous. (15). 

 Stamens epipetalous. (18). 



(15) Ovary 1-celled, ovule 1, pendulous. Herbs Plumbaginese, 



Ovary 5-ceUed, cells many-ovuled. (16). 



(16) Trees, shrubs or shrubby herbs, leafy. (17). 



Leafless herb, parasite. Monotropese, 



(17) Anthers opened by terminal pores Ericacese. 



Anthers opened by longitudinal slits Diapensiacese. 



(18) Ovary of two free carpels with connate styles or stigmas, or carpels 



separable. Carpels not confluent. (19). 

 Ovary of two or more confluent carpels. (21). 



(19) Leaves opposite. (20). 



Leaves alternate, carpels each 2-lobed Apocynacese, (Cerhera). 



(20) Pollen grains free, Apocynacese. 



(in Melodinus carpels confluent, in Rauwdfia they are partly confluent). 

 PoUen in waxy or granular masses Asclepiadese. 



(21) Ovary 1-celled, placenta free central, stamens opposite coUora-lobes (22). 

 Ovary 1 or more celled, placenta not free central. (23). 



(22) Herbs, fruits capsular Primulacese. 



Trees or shrubs, fruits baccate or somewhat baccate, not dehiscing .... 



MyrsinefB. 



(23) Leaves opposite, rarely temate. (24). 

 Leaves alternate or all radical. (29). 



(24) Trees or shrubs. (25). 

 Herbs. (28). 



(25) Stamens 2, ovary 2-celled, cells 1-ovuled Oleacese. 



Stamens 4-5. (26). 



(26) Anthers connivent, adnate to stigmas Apocynacese. 



Anthers free. (27). 



(27) Ovary 1-4-cellod, placenta axile or sub- basal. (28). 



Ovary 1-celled, placenta parietal, ovules \evj many. . .Gentianacese. 



