40 WOODY PLANTS OF MASSACHUSETTS. 
Sterile flowers only in catkins. 4. 
3. Both sterile and fertile flowers in catkins. 4. 
Leaves simple ; nuts in a cup. 49. Oax Faminy. I. 
Leaves pinnate; nuts not inacup. 51. Waznut Faminy. IV. 
Seeds with a tuft of cotton ; fertile and sterile flowers on different plants. 
54, Wittow Famiy. VII. 
Seeds without a tuft. 6. 
Leaves palmate both fertile and sterile flowers in globular catkins. Puane 
as 
5. 
Famity. 
Leaves not oalmate. 7. 
6. 
Fruit woody, or membranous or winged. 52. Bircu Faminy. V. 
Fruit a dry berry or nut, not winged. 8. 
Fruit a fleshy, compound berry. Munpzrry Faminy. IX. 
re 
Nut more or less covered or concealed. 50. Hornezam Famizy. ITI. 
Nut naked. 53. Wax Myrruz Faminy. VI. 
Leaves opposite. 10. 
Leaves alternate. 20. 
Leaves wanting. Cactus Faminy. XXY. 
e8) 
9, 
PLANTS WITH OPPOSITE LEAVES. 
Flowers with a calyx, and a corolla of 1 petal, or with no corolla. 11. 
10.4 Flowers with a calyx, distinct or obscure, and a corolla of many petals. 15 
Corolla wanting. 12. 
11.9 Corolla of 1 petal. 13. 
Leaves simple; fruit a double samara or key. Marne Famiry. XX XIII. 
2-9 Leaves pinnate; fruit a single samara or key. Aso Famity. XV. 2. 
pout 
per Faminy. XVII. 
Stamens 4 or 5; calyx and corolla 5-parted; ovary 3-or 5-celled. 14. 
13. 
Corolla tabwat often irregular; style thread-like. 59. Honzysucxir 
Faminy. 
Corolla heck shaped, regular; style almost wanting. 61. Exper Fam- 
my. XIX, 
; Stamens 4; calyx and corolla 4-parted; ovary 2- or 4-celled. 58. Map- 
J 
14, a 
Stamens fewer than 10. 16. 
15. 5 Stamens more than 10; style one. 78. Rock Rosz Faminy. XXXVI. 
Stamens more numerous than the petals. 17. 
Stamens as many as the petals. 18. 
Stamens once, or several times, 3, stigmas 3. 78. 
16. 
17. Fruit a leathery, prickly capsule. Horst Cuzstnut Faminy. p. 479. 
Fruit a double samara or key. Marie Faminy. XX XIII. 
Stamens opposite the petals; berry above the obsolete calyx. 76. Vine 
18. Faminy. XXX, 
Stamens alternate with the petals. 19. 
Calyx beneath 2 or 3 inflated capsules. Buapper Nur. XXXII. 1. 
Calyx indistinct, surmounting a 2-celled drupe. Cornus Faminy. XXTI. 
Calyx evident : flowers in terminal panicles ; berry fleshy Prim XV 1 
19. 
