IT 
II, a. — APETALOUS ANGIOSPERMS. 
Having a single perianth or calyx. 5 
Without a perianth, having neither calyx nor corolla. 
Leaves with stipules. 2 
Leaves without stipules. 
Flowers imperfect, some staminate, some pistillate. 1 
Flowers perfect, having both stamens and pistils. 
Embryo in a vitellus, or sac. Piperaceas. 
Embryo not in a vitellus. Podostemonaceas. 
1. — Flowers in aments. Carpels single. Mxricace.e. p. 395. 
Flowers not in aments. Carpels two or more. 
Fruit four seeded. Seeds peltate. Aquatic. 
CaLLITRICHAC EiE. 
Fruit usually three seeded. Seeds not peltate. 
Eupitorbiacea:. p. 293. 
2. — Flowers imperfect, some staminate, some pistillate. 3- 
Flowers perfect, having both stamens and pistils. 
Carpels three or- four. Ovule erect. Embryo in a vitellus, 
or sac. Marsh herbs. Saururaceac. p. 293. 
Carpel single. 
Ovule erect. Embryo in a vitellus, or sac. Piperacea:. 
Ovule suspended. Embryo not in a vitellus. 
Chloranthaceas. 
3. — Ovary with two cells or more. 4 
Ovary one celled. 
Ovules many, hairy or downy. Salicacea:. p. 307. 
Ovules not more than two. 
Ovule erect. Myricacea:. p. 305. 
Ovule pendulous. Platanaceas. p. 300. 
4. — Seeds winged. Altingiacea. 
Seeds wingless. Eupiiorbiaceai. p. 293. 
5. — Ovary inferior, or partly so. 17 
Ovary superior. 
Leaves with stipules. 13 
Leaves without stipules. 
