Bristly Locust, 58 Bristly Sarsaparilla, 80 Brome-grass, 7 Bromus, 7 Broom-rape Family, 106 Buchnera, 104 Buckbean, 88 Buckeye, 70 Buckhorn, 107 Buckthorn, 71 Buckthorn Family, 71 Buckwheat, 27 Buckwheat, False, 28 Buckwheat Family, 25 Buffalo Berry, 77 Buffalo Bur, 100 Buffalo Clover, 61 Bugbane, 39 Bugle, 98 Bugle Weed, 95 Bug-seed, 28 Bulrush, 7 Bur Clover, 60 Bur Cucumber, 112 Burdock, 117 Bur Marigold, 124 Burnet, 57 Bur Oak, 23 Bur-reed, 2 Bur-reed Family, 2 Bush Clover, 61, 63 Bush Honeysuckle, 110 Butter-and-eggs, 102 Buttercup, 36, 37, 38 Butterfly Weed, 91 Butternut, 21 Butterwort, 105 Button Bush, 108 Cacalia, 122 Cactaceae, 77 Cactus Family, 77 Cakile, 45 Calamagrostis, 5 Calamint, 97 Calla, 9 Callirhoe, 73 Callitrichaceae, 68 Callitriche, 68 Calopogon, 16 Caltha, 36 Calypso, 17 Camassia, 14 Camelina, 42 Camomile, 130 Campanula, 112 Campanulaceae, 112 Campion, 33, 34 Canada Thistle, 118 Canada Violet, 76 Canadian Blue Grass, 7 Cancer-root, 106 Cannabis, 24 Caper Family, 47 Capparidaceae, 47 Caprifoliaceae, 109 Capsella, 46 Caraway, 83 Cardamine, 45, 47 Cardinal Flower, 113 Carduus, 118 Carex, 8 Carpet-weed, 31 Carpet-weed Family, 31 Carpinus, 21 Carrion-flower, 11 Carrot, Wild, 82 Carum, 83 Carya, 21 Caryophyllaceae, 31 Cashew Family, 68 Cassia, 60 Castalia, 35 Castanea, 22 Castilleja, 102 Catchfly, 33, 34 Catnip, 98 Cat-tail, 2 Cat-tail Family, 2 Caulophyllum, 40 Ceanothus, 71 Cedar, 1 Celandine, 41 Celandine Poppy, 41 Celastraceae, 69 Celastrus, 69 Celtis, 24 Cenchrus, 5 Centaurea, 121 Centaurium, 89 Centaury, 89 Cephalanthus, 108 Cerastium, 33 Ceratophyllaceae, 34 Ceratophyllum, 34 Cercis, 58 Chaerophyllum, 83 Chamaedaphne, 86 Chamaelirium, 13 Charlock, 44 Cheat, 7 Chelidonium, 41 Chelone, 104 Chenopodiaceae, 28 Chenopodium, 28, 29 Cherry, 54 Cherry, Ground, 101 Chervil, 83 Chestnut, 22 Chickweed, 32, 33 Chickweed, Mouse-ear, 33 Chicory, 115 Chimaphila, 85 Chiogenes, 85 Chives, Wild, 13 Chokeberry, 55 Choke Cherry, 54 Chrysanthemum, 121, 130, 131 Chrysosplenium, 50 Cichorium, 115 Cicuta, 82 Cimicifuga, 39 Cinquefoil, 52, 56, 57 Circaea, 78 Cirsium, 117, 118 Cistaceae, 74 Cladium, 8 Clammy Locust, 58 Clammy-weed, 47 Claytonia, 34 Clearweed, 24 Cleft Phlox, 92 Clematis, 35 Climbing Fumitory, 41 Climbing Rose, 52 Clintonia, 13 Clover, 61 Clover, Bush, 61, 63 Clover, Hop, 60 Clover, Prairie, 60 Clover, Sweet, 61 Cocklebur, 114 Cockle, Corn, 33 Coffee-tree, 58 Cohosh, Blue, 40 Colic-root, 13 Collinsia, 104 Collinsonia, 95 Coltsfoot, 122, 130 Columbine, 36 Comandra, 24 Comfrey, 93, 94 Commelina, 9 Commelinaceae, 9 Common Blue Violet, 76 Common Cat-tail, 2 Common Vetch, 59 Compass Plant, 127 Compositae, 113 Composite Family, 113 Coneflower, Gray-headed, 128 Coneflower, Purple, 131 Conioselinum, 83 Conium, 83 Conopholis, 106 Conringia, 42 Convolvulaceae, 91