GROUPS AND ORDERS. 3 



Group 5. Ovary compound, one-celled with a free central placenta, or soveral-celled with the placents in the axil. Calyx 

 free from the ovary, or nearly so. Embryo coiled around the outside of the albumen. 



19. CARYOPHTLLACEa;. Sepals and petals equal in number. Stipules none. 



20. iLLECEBRACEa;. Sepals and petals equal in number, the latter often wanting. Stipules Bcarious. 



21. PoBTDLACACEjE. Sepals 2-3. Petals 5. Stipules uoue. 



Group 6. Ovary compound, several-celled, with the placentte in the axis ; or the numerous carpels more or less coherent 

 virith each other, or with the central axis. Calyx free from the ovary, with a valvate aistivation. Stamens 

 numerous, monadelphous, free, or somewhat polyadelphous, inserted with the petals into the receptacle or 

 base of the calyx. 



32. Malvaces:. Stamens monadelphous ; anthers one-celled. 



23. TiLiACE^. Stamens distinct, or somewhat poly adelphous ; anthers 2-celled. 



Group 7. Ovary compound, or of several carpels adhering to a central axis, free from the calyx, which is mostly imbri- 

 cated in aestivation. Stamens as many or twice as many as the petals, inserted on the receptacle, commonly 

 monadelphous at the base. Flowers perfect. 



* Flowers regular, or nearly so. Sepals imbricate. 



24. LiNACEi. Ovary of 3 - 5 united carpels, each in the capsule spuriously 3-celled by a false partition from the 



back ; the spurious cells with a single ovule. 



25. Geraniaces. Carpels 5, one-seeded ; styles cohering to the elongated axis, from which they at length separate 



by twisting or curling back from below upwards. Seeds without albumen. 



26. OzALiDACEf. Carpels 5, commonly several-seeded, united in a membranaceous 5-celled capsule. Seeds arillate, 



albuminous. Trifoliolate. 



•♦ Flowers irregular. 

 37. BALSAMiNACEiE. Sepals 5; the 2 upper ones commonly united into one; the lower one spurred. Petals 4, 

 united in pairs. Stamens 5. Capsule bursting elastically. 



*** Flowers regular. Sepals valvate. 



28. LiMNANTHACEiE. Stamens twice as many as the petals. Carpels 3-5, distinct, united by their styles, in fruit 



forming fleshy achenia. Seeds without albumen. Leaves pinnati£d. 



Group 8. Ovary compound, with from 2 to several cells ; or carpels several, and more or less united by their styles. Calyx 

 free. Petals as many as the sepals, or rarely wanting. Stamens as many or twice as many as the sepals, 

 inserted into the receptacle or base of the calyx. Flowers often dioecious or polygamous. 



29. AuACARDiACEa:. Stamens as many as the petals. Ovary one-celled, with 3 styles or stigmas and a single 



ovule. leaves not dotted. Albumen none. 



30. Zantboxtlaceje. Carpels 2 or more, separate or xinited ; seeds one or two in each cell or carpel. Seeds 



albuminous. 



Group 9. Ovary compound, 2 - 3-lobed, 2 - 3-celled, free from the calyx. Petals (except in Aceracea) irregular, usually 

 one fewer than the sepals, or sometimes wanting. Stamens definite, distinct, inserted on or around a hypo- 

 gynous disk. Seeds destitute of albumen. — Mostly trees or shrubs. 



31. Acesace:e. Flowers regular. Fruit formed of 2 cohering samaraa. 



33. HiPPOCASTANACEiE. Fruit large, roundish, dehiscent, with 1-3 very large seeds. Leaves digitate. 



Group 10. Ovary compound, 2 - 5-celled. Calyx free from or adherent to the base of the ovary. Petals and stamens 

 equal in number to the lobes of the calyx, and inserted into its base or throat, or upon the disk that coven 

 it. Seeds albuminous. — Trees or shrubs. Flowers regiilar. 



* Stamens alternate with the petals. 



33. CelastbacejE. Calyx imbricated. Seeds usually arillate, 



*♦ Stamens opposite the petals. Calyx valvate. 



34. RHAMNACEau Ovary usually coherent with the tube of the calyx, mostly 3-celled, with a single ovule in each 



cell. 



35. ViTACEi:. Calyx free. Ovary mostly 2-celled, with 2 ovules in each cell. 



