KEY TO THE FAMILIES 37 



11. Fruit entirely surrounded by the usually elon- 

 gated calyx-tube. 



45. Nyetaginacede (p. t95) 

 11. "Fruit not surrounded by the calyx-tube, the sepals 

 united only at the base. 

 12. Flowers without bracts, the perianth not 



scarious 43. Chenopodiaceae (p 188) 



12. Flowers with scarious bracts and perianth. 



44. Amaranthaceae (p. 189) 

 Z.) Ovary of 4 to 8 nearly or quite free, few- to many-ovuled carpels; 



stamens united into a column 86. Sterculiaceae (p. 326) 



5.J Ovaryof several united carpels. 



6. Flowers unisexual 75. Euphorbiaceae (p. 279) 



6. Flowers perfect. 



7. Shrubs or small trees , 92. E^lacoiirtiaceae (p. 334) 



7. Herbs. 



8. Flowers 5-merous; leaves opposite or whorled; stems 



terete 46. Aizoaceae (p. 197) 



8. Flowers 4-merous; leaves alternate; stems 4-angled. 



97. Lythraceae (p. 340) 



(Ammannia sp.) 

 2. Ovary inferior. 



3. Anthers opening by hinged valves; vines with 3-foliolate leaves and 



winged fruits 56. Hernandiaceae (p. 212) 



(Illigera) 



3. Anthers not opening by hinged valves; leaves simple. 



4. Vines with medium to large, very irregular flowers. 



41. Aristolochiaceae (p. 186) 



4. Trees with small regular flowers 102. Combretaceae (p. 348) 



(Terminalia) 

 .■SMMnti" Chorlpetalae 



(Polypetalae) 



(Calyx and corolla both present, the corolla of distinct and separate 



petals.) 



(IJ) Ovary superior, free from the calyx. 

 (S^; Ovary simple, of a single carpel. 



3. Submerged aquatic plants with finely divided leaves. 



50. Ceratophyllaceae (p. 202) 

 3. Not submerged aquatic plants. 



4. Anthers opening by hinged valves 55. Lauraceae (p. 209) 



4. Anthers not opening by hinged valves. 



' 5. Twining, herbaceous, somewhat fleshy vines, with small, perfect 

 flowers; sepals 2; fruit a dry or fleshy indehiscent utricle. 



48. Baaellaceae (p. 200) 

 5. Vines with small, unisexual flowers; fruit a small drupe. 



52. Meniapermaceae (p. 208) 



5. Plants of various habits, with perfect flowers, or if with 



unisexual flowers, then shrubs or trees; sepals always more 



than two. 



6. Herbs, vines, shrubs, or trees with regular or irregular 



flowers, the fruit a dehiscent on indehiscent pod (legume). 



66. Leguminoaae (p. 221) 



