92 



CHOEIPETALAE. 



Flowers not in aments (in ament-like spikes, in 

 Morns) ; but variously clustered, or rarely 

 solitary. 



Flowers monoecious, dioecious or polygamous, or 

 perfect in Protcales ; ovary superior, 1- 

 celled. 



Flowers regular. Order 



Flowers irregular. Order 



Flowers dioecious or perfect 



least in part. 

 Ovary 1-celled. 

 Ovary several-celled 

 flowers perfect. 



ovary inferior, at 



8. 

 9. 



(usually 



Order 10. 

 6-celled) 



Order 11. 

 Flowers mostly perfect ; ovary superior. 



Embryo straight or nearly so : fruit an achene. Order 12. 

 Embryo coiled, curved or annular ; fruit not 



an achene. Order 13. 



UETICALES. 

 PROTEALES. 



SANTALALES. 

 ARISTOLOCHIALES. 

 POLYGON ALES. 

 CHENOPODIALES. 



tt Petals present (wanting in Ceratophyllaceae, aquatic herbs with whorled 

 dissected leaves ; in many Ranunculaceae ; in Lauraceae, alternate-leaved aromatic 

 trees and shrubs ; in Zanthoxylum, pinnate-leaved trees of the Rutaceae ; in many 

 Euphorbiaceae : in some species of Ludwiyia in Onagraceae ; in Proscrpinaca of the 

 Haloragidaceae) . 



A. Ovary superior, free from the calyx (partly or wholly inferior in Hydrangeaceae, 

 Grossulariaceae, Losasaceae and Malaceae). 



Carpels solitary, or several and distinct (united in some 

 mens mostly hypogynous and more numerous than the 

 distinct. Order 



Carpels 2 or more, united into a compound ovary ; 



stamens hypogynous : sepals mostly distinct. 

 Plants not insectivorous. Order 



Insectivorous plants, secreting a viscid liquid, 



with basal leaves and scapose flowers. Order 



Carpels solitary, or several and distinct, or some- 

 times united ; stamens mostly perigynous or epi- 

 gynous ; sepals mainly united or confluent with 

 the concave receptacle (hypanthium). Order 



Carpels united into a compound ovary ; sepals 



mostly distinct. 

 Stamens few, rarely more than twice as many 



as the petals. 



Stamens as many as the sepals or fewer 



and opposite them, or more numerous. 



Ovules pendulous, the raphe toward the 



axis of the ovary. Order 



Ovules pendulous, the raphe away from 

 the axis of the ovary, or erect, or as- 

 cending. Order 

 Stamens as many as the sepals and alternate 

 with them, opposite the petals when these 

 are present ; ovules erect. Order 

 Stamens usually very numerous (except in 

 Violaceae and Passifloraceae) ; disc in- 

 conspicuous, or none. 

 Sepals valvate ; placentae united in the axis 



of the capsule. Order 



Sepals or calyx-segments imbricated or con- 

 volute ; placentae mainly parietal, some- 

 times united in the axis. 

 Leaves bilaterally symmetrical. 



Sepals separate. Order 



Sepals united. Order 



Leaves oblique. Order 



Nymphaeaceae) ; sta- 

 sepnls ; sepals mostly 

 14. RANALES. 



15. PAPAVERALES. 



16. SARRACEXIALES. 



17. ROSALES. 



18. GERANIALES. 



10. SAPINDALES. 



20. RHAMNALES. 



21. MALVALES. 



22. HYPERICALES. 



23. PASSIFLORALES. 



24. BEGONIALES. 



B, Ovary inferior, adnate to the calyx, wholly or in part (except in Lythraceae and 

 our Melastomaceae, where it is usually merely enclosed by it, and in Thyme- 

 leaceae and Elaeagnaceae, which are shrubs or trees with no corolla). 



Fleshy spiny plants, with jointed stems, the leaves 

 mostly very small or none ; calyx-segments and 

 petals numerous. 



Herbs, shrubs or trees, not fleshy or spiny ; calyx- 

 segments rarely more than 5. 

 Ovules several or numerous in each cavity of the 

 ovary (except in Haloragidaceae, aquatic 

 herbs). 

 Ovule 1 in each cavity of the ovary. 



Order 25. OPUNTIALES. 



Order 26. MYRTALES. 

 Order 27. AMMIALES. 



