18 ANALYTICAL KEY 



Calyx 5-lobed or of 5 equal sepafl SAXIFRAGACEAE, 44-4 



Calyx of 3 equal or 5 very unequal sepals CISTACEAE, 576 



A.. Ovary 2-several-celled B. 

 B. Flowers irregular C. 

 C. Anthers opening at the top. 



Anthers 6-8, 1-celled POLYGAL.AC*AE, 538 



Anthers 10, 2-celled Rhododendron, 631 



C. Anthers opening lengthwise. 



Stamens 12 and petals 6 on the throat of the gibbous calyx Cuphea, 693 

 Stamens 5-10 and petals hypogynous or nearly so. 

 Ovary 3-celled ; trees or shrubs Aesculus, 550 



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 OLEACEAB, 6T>0 



Stamens more numerous than the petals ACERACEAK, f>.">7 



Herbs. 



Petals 5 HYPERICACEAE, ">71 



Petals 4 CRUCIFERAE, 418 



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

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

 Herbs. 



Flowers monoecious or dioecious EUPHORBIACEAE, 540 



Flowers perfect and symmetrical. 

 Cells of the ovary as many as the sepals. 

 Ovary 2-3-celled LIMNANTHACEAE, 551 



Ovary 5-celled GERANIACEAK, 5o4 



Cells of the ovary twice as many as the sepals. 

 Leaves abruptly pinnate ZYOOPHYLLACEAE, ~>:f> 



Leaves simple LJNACEAE, 531 



Shrubs or trees. 

 Leaves compound. 



Leaves 3-foliolate, punctate Ptelea, 537 



Leaves pinnate, not punctate SAPINDACEAE, 559 



Leaves simple. 



Leaves palmately veined ACERACEAE, 557 



Leaves pinnately veined. 

 Leaves alternate. 



Climbing shrub Celastrus, 557 



Erect shrubs or trees. 



Flowers racemose CYRILLACKAK, 553 



Flowers solitary or cymose AQUIFOLIACKAK, ">.">-t 



Leaves opposite CELASTRACEAE, 55<i 



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

 F. Leaves compound. 



Tree or shrub STAPHYLEACEAE, 557 



Herbs ; leaves alternate, or all radical. 



Leaflets 3, obcordate OXALIDACEAE, 532 



Leaflets more numerous, pointed Astilbe, 444 



F. Leaves simple. 



Stipules present Itetwee-i opposite leaves ELATINACEAK, 575 



