140 LESSONS IN BOTANY 



17. Leaves opposite 18. 



17. Leaves alternate 19. 



18. Fruit a pyxis, opening by a lid. * Order 25 



18. Fruit a capsule, opening by 4 or 5 valves. * Order 21 



19. Fruit a capsule, 5-celled, 5-horned. * Order 56 



19. Fruit a fleshy, 4- oo-secded berry. * l\>keweedn. lOc! 



19. Fruit dry, 1-seeded, opening by a lid. * Amaranth*. llt) 



20. Flowers on a spadix with a spathe. * Order 131 



20. Flowers in a long, naked spike. Stamens 6 or 7. Lizard-tails. 1^3 



20. Flowers solitary, axillary, minute. Water-plants 21. 



21. Stamen 1. Leaves opposite. Starworts. 12-5 



21. Stamens 2. Leaves alternate, dissected. Threwlfoott. 125 



21. Stamens 12-24. Leaves whorled, dissected. Hornwurti. 126 



2. Flowers, none of them in amenta 23. 



22. Flowers (imperfect), the sterile only in aments 34. 



22. Flowers (imperfect], both the sterile and the fertile in amenta. ..35. 



23. Leaves opposite 24. 



23. Leaves alternate 27. 



24. Stamens a. * Order 99 



24. Stamens 3. Parasites. Mistletoe Lorantht. 108 



24. Stamens 4-9.... 25. 



25. Fruit a double, 2-winged samara. * Order 40 



25. Fruit not winged.. . .26. 



26. Seeds 6. Low shrubs. Box. Spurgeworts. 113 



26. Seed 1. Shrubs. Oleasters. Ill 



27. Style or stigma 1. Seed 1 .... 28. 



27. Styles or stigmas 2 31. 



27. Styles or stigmas 3-9 32. 



28. Calyx free from the ovary.... 29. 



23. Calyx adherent to the ovary 30 



29. Anthers opening by valves. * Laurels. 118 



2D. Anthers opening by slits. * Daphnads. 107 



30. Seeds 2-4. Shrubs. Kandalworts. 109 



80. Seed 1. Trees. * Order 65 



31. Stamens numerous. * Order 6V 



81. Stamens as many as the calyx lobes. Elmworts. 11? 



32. Leaves pinnate. Pistils 5. (Prickly Ash.) Order 37 

 82. Leaves simple, linear, evergreen. (Jrowberries. \\ f 



82. Leaves simple, not linear. . . .33. 



33. Flowers 3 parted. Fruit dry. (StiUirigia.) Kiiurgewurts. Hi 



83. Flowers 4 or 5-parted. Fruit fleshy. * (Buckthorns.) Order 43 

 34. Nut or nuts in a cup or involucre. Leaves simple. * Mastworts. 119 

 84. Nut naked, a tryma ( 172). Leaves pinnate. * Walnuls ; Hickorywurts. 117 



