66 GAMOPETAL^. KEY TO THE ORDERS. 



(28) Stamens didynamous Verbenacese. 



Stamens equal Loganiacese. 



(in 3Iitrasac)ne Ovary 2-celled, cells many-ovuled, stamens 5). 



(29) Aquatic herb, leaves floating, ovary 1-celled Gentianacese, 



(Limnanthemum). 

 Ten-estrial. (30). 



(30) Herb with cauline leaves, or shrubs or trees. (31). 



Herb, with all radical leaves Plantagineae. 



(31) Ovai'y 1-celled, ovules many, placenta parietal, undershrubs 



Gesneraceas, {Isanfliera). 



Ovary 2- or more-celled. (32). 

 (32)«) Ovary 2-4-celled, ovules 4. (33). 



;9) Ovary 2-celled, cells many-ovuled. (33a). 



;-) Ovary 2-6-celled, ceUs 1-2 ovuled, shrubs or trees. (34). 



(33a) Styles 2 Hydrophyllacese. 



Styles 1 Solanacese. 



(33) Corolla plaited in bud Convolvulaceae. 



CoroUa-lobes imbricate in bud Boraginese. 



(34) Flowers bisexual. (35). 



Flowers unisexual or polygamous. (36). 



(35) Leaves simple. (35a). 



Leaves compound Ampelidese, {Leea). 



(35a) Ovary-cells 1-ovuled Sapotacese. 



Ovary-cells more than 2-ovuled Styracese. 



(36) Petals contorted, sepals accrescent Ebenacese. 



Petals imbricate Oleacete. 



(37) Leafless herbs. (33). 



Leafy herbs, shrubs, or ti-ees. (40). 



(38) Stamens 4, didynamous, anthers 1-2-celled. (39). 



Stamens 2, anther-cells confluent Lentibulariacese. 



(39) Ovary 1-celled, placenta 2, parietal Orobanchaceffi. 



Ovary 2-celIed, placenta 2, axile, anthers 1-celled. ScrophulariaceaB, 



{Striga), 



