CHARACTERISTICS OF NATURAL ORDERS. 187 



Disdfloral Polypetalous Exogens. 



19. Linaceae. Flowers regular ; stamens 5 ; petals convolute ; 

 capsule 8-io-seeded. Herbs with entire leaves. 210. 



20. Geraniaceae. Flowers regular ; ovary 3-5-lobed ; receptacle 

 elongated ; glands outside the stamens ; leaves variously cut. Herbs, 

 or shrubby. 211. 



21. Rutaceae. Flowers regular ; ovary on a disk ; leaves punctate, 

 compound, or divided. Herbs, shrubs, or trees. 212. 



22. Aquifoliaceae. Flowers 4-8-merous ; stamens on base of 

 petals ; drupe berry-like. Trees or shrubs. 213. 



23. Rhamnaceae. Stamens opposite the petals, and on a disk ; 

 a single erect ovule in each of the 2-5 cells ; leaves simple, alternate. 

 Shrubs or trees, with bitter principle. 213. 



24. Vitaceae. Stamens opposite the caducous petals. Climbing 

 shrubs. 214. 



25. Sapindaceae. Flowers unsymmetrical ; stamens 5-10, on a 

 disk ; ovary 2-3-celled, with 1-2 seeds in each cell. Trees, shrubs, or 

 herbaceous climbers. 214. 



26. Anacardiaceae. Flowers small, symmetrical ; ovary i-seeded, 

 with 3 styles. Trees or shrubs, with acrid juice. 215. 



Perigynous and Epigynous or Superior Polypetalous Exogens. 



27. Leguminosae. Flowers papilionaceous or regular ; odd sepal 

 anterior ; stamens usually 10. Fruit a legume. 216. 



28. Rosaceae. Flowers regular, odd sepal posterior ; stamens oo, 

 perigynous ; usually stipules. Endosperm. 217. 



29. Saxifragaceae. Flowers regular, much like 28, but having 

 albumen in the seeds, and no stipules, 225. 



30. Crassulaceae. Flowers symmetrical ; pistils usually separate, 

 ovules co. Leaves fleshy. 226. 



31. Droseraceae. Flowers regular. Herbs with gland-bearing 

 leaves. 227. 



32. Hamamelaceae. Flowers in close clusters ; carpels 2, united 

 below. Shrubs or trees. 228. 



33. Halorageae. Flowers small; ovaries i-4-celled; styles dis- 

 tinct. Aquatic plants. 228. 



34. Melastomaceae. Anthers opening by pores ; leaves opposite, 

 3-7-ribbed, without stipules. 228. 



35. Lythraceae. Calyx inclosing the i-oo -celled ovary ; anthers 

 open lengthwise ; style I, seeds many. Leaves opposite, without 

 stipules. 229. 



