140 LESSONS IN BOTANY 
17. Leaves opposite....18. 
Sd 
17. Leaves alternate....19. 
18, Fruit a pyxis, opening by a lid. * Order 
18. Fruit a capsule, opening by 4 or 5 valves. * Order 
19. Fruit a capsule, 5-celled, 5-horned. * Order 
19. Fruit a fleshy, 4- »-seeded berry. “ Pokeweeds. 
19. Fruit dry, 1-seeded, opening by a lid. Amaranths. 
20. Flowers on a spadix with a spathe. * Order 
20. Flowers in a long, naked spike. Stamens 6 or 7. Dizard-tails. 
20. Flowers solitary, axillary, minute. Water-plants....21. 
21. Stamen 1. Leaves opposite. Starworts, 
21. Stamens 2, Leaves alternate, dissected. Threadfoots. 
21. Stamens 12-24. Leaves whorled, dissected. flornworts. 
22. Flowers, none of them in aments....23. 
22. Flowers (imperfect), the sterile only in aments....84, 
22, Flowers (imperfect), both the sterile and the fertile in aments. ..35. 
23. Leaves opposite... .24. 
23, Leaves alternate....27; 
24, Stamens 2. * Order 
24. Stamens 8. Parasites. Mistletoe—Loranths. 
24, Stamens 4-9....25, 
25, Fruit a double, 2-winged samara. * Order 
25. Fruit not winged....26. 
26. Seeds 6. Lowshrubs. Boa. Spurgeworts. 
26. Seed 1. Shrubs. Oleasters. 
27. Style or stigma l. Seed 1....28, 
27. Styles or stigmas 2,...81. 
27. Styles or stigmas 8-9....32. 
28. Calyx free from the ovary....29. 
28. Calyx adherent to the ovary....80 
29. Anthers opening by valves, * Laurels, 
29. Anthers opening by slits. Daphnads. 
80. Seeds 2-4. Shrubs. Sandalworts. 
80. Seed 1. Trees, * Order 
81, Stamens numerous. * Order 
81, Stamens as many as the calyx lobes, Elmworts. 
82. Leaves pinnate. Pistils 5. (Prickty Ash.) Order 
-82. Leaves simple, linear, evergreen. Crowber tes. 
82. Leaves simple, not linear....83, : 
83. Flowers 8-parted. Fruit dry. (Stellingia.) Spurgeworts. 
83. Flowers 4 or 5-parted. Fruit fleshy. (Buckthorns.) Order 
84, Nut or nuts in a cup or involucre, Leaves simple. * Mastworts, 
84. Nut naked, a tryma (§ 172). Leaves pinnate, Hickoryworts. 
111 
43, 
119 
118 
