KEY TO THE FAMILIES 37 
11. Fruit entirely surrounded by the: usually elon- 
gated calyx-tube. 
45. Nyctaginaceae (p. 195) 
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) 
5. Ovary of 4 to 8 nearly or quite free, few- to many-ovuled carpels; 
stamens united into a column........ 86. Sterculiaceae (p. 326) 
5. Ovary of several united carpels. 
6. Flowers unisexual............................ 75. Euphorbiaceae (p. 279) 
6. Flowers perfect. : 
7. Shrubs or small trees..................-- 92. Flacourtiaceae (p. 334) 
7. Herbs. : 
8. Flowers 5-merous; leaves opposite or whorled; stems 
22 Re eat ch a eae aah ant 46. Aizoaceae (p. 197) 
8. Flowers 4-merous; leaves alternate; stems 4-angled. 
97. Lythraceae (p. 340) 
(Ammannia sp.) 
2. Ovary inferior. 
8. Anthers opening by hinged valves; vines iia 3-foliolate leaves and 
oF he ig 0 I a eel dt 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) 
Choripetalae 
(Polypetalae) 
(Calyx and corolla both present, the corolla of distinct and separate 
petals.) ‘ 
1. Ovary superior, free from the calyx. 
2. 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. Basellaceae (p. 200) 
5. Vines with small, unisexual fiowers; fruit a small drupe. 
52. Menispermaceae (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). 
65. Leguminosae (p. 221) 
