18 



ANALYTICAL KEY 



Saxifragaceae, 444 



CiSTACEAE, 576 



POLYGALACEAE, 538 



Rhododendron, 631 



Cuphea, 693 



Calyx 5-lobed or of 5 equal sepals 

 Calyx of 3 equal or 5 very unequal sepals 

 A. Ovary 2-several-celled B. 

 B. Flowers irregular C. 

 C. Anthers opening at the top. 

 Anthers 6-8, 1-celled 

 Anthers 10, 2-celled 

 C. Anthers opening lengthwise. 



Stamens 12 and petals 6 on the throat of the gibbous calyx 

 Stamens 5-10 and petals hypogynous or nearly so. 

 Ovary 3-celled ; trees or shrubs Aesculus, 559 



Ovary 5-celled ; herbs Balsaminaceae, 560 



B. Flowers regular or nearly so D. 



D. Stamens, neither just as many nor twice as many as the 

 petals. 

 Trees or shrubs. 

 Stamens fewer than the 4 petals 

 Stamens more numerous than the petals 

 Herbs. 

 Petals 5 

 Petals 4 

 D. Stamens just as many or twice as many as the petals 

 E. Ovules and seeds only 1 or 2 in each cell. 

 Herbs. 

 Flowers monoecious or dioecious 

 Flowers perfect and symmetrical. 

 Cells of the ovary as many as the sepals. 

 Ovary 2-3-celled 

 Ovary 5-celled 



Oleaceae, 650 



acebacbae, 557 



Hypericaceae, 571 

 Cruciferae, 418 

 E. 



EUPHORBIACEAE, 540 



Limnanthaceae, 551 

 Geraniaceae, 534 



Cells of the ovary twice as many as the sepals. 



Leaves abruptly pinnate 

 Leaves simple 

 Shrubs or trees. 

 Leaves compound. 

 Leaves 3-foliolate, punctate 

 Leaves pinnate, not punctate 

 Leaves simple. 

 Leaves palmately veined 

 Leaves pinnately veined. 

 Leaves alternate. 

 Climbing shrub 

 Erect shrubs or trees. 

 Flowers racemose 

 Flowers solitary or cymose 

 Leaves opposite 

 E. Ovules, and usually seeds, several or many in each cell 

 F. Leaves compound. 

 Tree or shrub 



Herbs ; leaves alternate, or all radical. 

 Leaflets 3, obcordate 

 Leaflets more numerous, pointed 

 Leaves simple 

 Stipules present between opposite leaves 



Zygophyllaceae, 536 



LiNACEAE, 531 



F. 



Ptelea, 537 

 Sapindaceae, 559 



Aceraceae, 557 



Celastrus, 557 



CYRIIiLACEAE, 553 



Aquifoliaceae, 554 

 Celastraceae, 556 

 F. 



Staphyleaceae, 557 



oxalidaceae, 532 



Astilbe, 444 



Elatinaceae, 575 



