THALAMIFLOE^. 



515 



Albumen ruminate. Shrubs . . • Anonacece. 4. 

 Albumen in small quantity, or altogether want- 

 ing. 



Flowers unisexual MenisperviacecB. 7. 



b. Carpels combined into a solid pistil or ovary. 

 Placentas parietal. 



Stamens tetradynamous CrucifercB. 15, 



Stamens not tetradynamous. 

 Large hypogynous disk. 

 Flowers tetraraerous. Fruit closed at the 



apex Capparidaceee. 16. 



Flowers not tetramerous. Fruit usually 



open at the apex Resedacece. 17. 



Small hypogynous disk, or none. 

 Albumen abundant. 



Flowers irregular Fmnariaceee. 14. 



Flowers reguiiir. Sap milky. Fruit 



without central pulp .... Papaverace<B. 13. 

 Fruit with central' pulp, or fleshy. 



Sap watery Flacourtiacece. 19. 



Albumen in small quantity, or wanting. 



Calyx tubular, furrowed . . . FrankeniacecB. 23. 

 Placentas covering the dissepiments . . . Nymphceacece. 10. 

 Placentas axile. 



Styles distinct to the base. 



Calyx valvale Vivianiacece. 27. 



Calyx much imbricated. 

 Seeds smooth. Petals unequal-sided, 



without appendages .... IlypericacecB. 36. 



Seeds shaggy. Petals unequal-sided, usu- 

 ally with appendages at the base . . Reaumur iaceee. 37. 

 Seeds smooth. I'etals equal . . . Linacece. 65. 

 Calyx slightly imbricated. 

 Petals not twisted in aestivation. Ovary 

 with a free central placenta . . . Caryopkyllacece. 26. 

 Styles more or less combined. 

 Fruit gynobasic. 

 Stamens arising from scales . . . Simarubacece. 63. 

 Stamens not arising from scales. 

 Styles wholly combined. 

 Flowers hermai)hrodlte . . . Rutacece. 59. 

 Flowers unisexual, or polygamous . Xanthoxylacece. 60. 

 Styles divided at the apex. 

 Flowers irregular. Fruit usually with 



elastic valves. Balsaminacece. 67. 



Fruit not gynobasic. 



Calyx much imbricated, in an irregular 

 broken whorl. 

 Flowers symmetrical . . . ClusiacecE. 35. 

 Flowers unsymmetrical. 

 Flowers regular. 

 Petals with appendages at their 



base. Leaves alternate . . SapindacCiS. 40. 

 Petals without appendages at 

 their base. Leaves opposite . Aceracece. 44. 

 Flowers irregular. 

 Flowers falsely papilionaceous. 



Ovary 2— 3-celled . . . Polygalacea. 41. 

 Flowers not papilionaceous in ap- 

 pearance. Ovary 1 -celled . Krameriacea. 42. 

 Calyx but little imbricated, in a complete 

 whorl. 

 Carpels 4 or more. 



Seeds winged Cedrelaceec. 48. 



Seeds wingless. 

 Stamens united into a long tube . Meliaceie. 49. 

 Stamens distinct, or nearly so 

 LL 2 



