Chapter I

Incienso 53
Indianwheat 25
Indigobush 102
Inkweed 108
Iodinebush 108
Ipomoea 99
Ironwood 28, 81

J
Jackass-clover 37, 41
Jimmyweed 55
Jimson 11
Jimsonweed 11
Jointfir family 34
Jojoba 104
Joshua-tree 5, 6, 18, 61
Jumping cactus 26
Junco family 106

K
Kallstroemia 39
Koeberlinia 106