It is generally the most conspicuous part of the flower, but may be
completely absent, or inconspicuous, or replaced by the calyx.
=Corymb.= A flat-topped or convex-topped flower-cluster.
=Creeping.= With stems prostrate on the ground and rooting at intervals.
=Crenate.= With round-pointed teeth at the margin.
=Crenulate.= Finely or minutely crenate.
=Cuspidate.= Ending with a short sharp stiff point.
=Deciduous.= Not persistent for a long time; not evergreen.
=Decompound.= Repeatedly branched with numerous leaflets.
=Decurrent.= Extending with wing-like expansions down the stem.
=Decumbent.= A stem prostrate at the base, but with the tip more or less
ascending.
=Dehiscent.= Breaking open at maturity to discharge the contents.
=Deltoid.= Broadly triangular.
=Dioecious.= Bearing staminate and pistillate flowers upon separate
plants.
=Dissected.= Finely divided into numerous small or narrow segments.
=Divided.= With deep segments or lobes.
=Elliptical.= Having the shape of an ellipse.
=Elliptical-lanceolate.= Intermediate in shape between elliptical and
lanceolate.
=Entire.= With an unbroken margin, without teeth or lobes.
=Epiphyte.= A plant growing attached to the bark of another plant, and
without connection with the soil.
=Erect.= Growing in nearly or quite a vertical position.
=Evenly pinnate.= A compound leaf terminating in a pair of leaflets.
=Filament.= The (usually) slender basal portion of a stamen, supporting
the anther at its tip.
=Floweret.= A small flower.
=Gamopetalous.= Composed of united petals.
=Gamosepalous.= Composed of united sepals.
=Glabrous.= Smooth; without hairs.
=Glandular.= Bearing glands.
=Glaucous.= Covered with a thin bluish or whitish deposit, easily rubbed
off.
=Glume.= A bract at the base of a spikelet of a grass.
=Half recurved.= Curved half-way backward.
=Hastate.= Shaped like an arrow-head, but with the basal lobes pointing
outwards instead of backward.
=Head.= A dense cluster of flowers, about as broad as long.
=Hirsute.= With stiff coarse hairs.
=Imperfect.= Flowers which contain either pistil or stamens, not both.
=Incised.= With deep, sharp, irregular, divisions.
=Indehiscent.= Not breaking open at maturity to discharge the contents.
=Inflorescence.= A cluster of flowers.
=Internode.= A section of stem between two joints, or nodes.
=Involucre.= A collection of bracts at the base of a flower-cluster.
=Irregular.= Possessing similar parts of different size or form. An
irregular flower is generally distinguished by petals of unequal
size or shape.
=Laciniate.= Cut into narrow pointed lobes or divisions.
=Lanceolate.= Shaped like a lance-head, several times longer than wide,
and broadest below the middle.
=Linear.= Long and narrow, but with about uniform width.
=Linear-lanceolate.= Intermediate in shape between linear and lanceolate;
narrowly lanceolate.
=Lip.= The largest and most conspicuous petal in an irregular corolla,
usually applied to the lower petal of an orchid.
=Lobe.= A segment or division of any organ.
=Leaflet.= One portion of the blade of a compound leaf.
=Lemma.= One of the bracts in the spikelet of a grass, and described in
the treatment of that family.
=Membranous.= Thin or membrane-like in texture.
=Monoecious.= Bearing stamens and pistils in separate flowers, but on the
same plant.
=Mucronate.= Tipped with a short small abrupt tip.
=Node.= A joint of a stem, at which leaves are borne and branches appear.
=Oblanceolate.= Reversed lanceolate in shape.
=Oblique.= With unequal sides.
=Oblong.= Somewhat rectangular in shape, with parallel sides.
=Oblong-lanceolate.= Intermediate in shape between oblong and lanceolate.
=Oblong-spatulate.= Intermediate in shape between oblong and spatulate.
=Obovate.= Reversed ovate in shape.
=Obtuse.= Blunt-tipped; terminating in an obtuse angle.
=Odd-pinnate.= A compound leaf terminating in a single leaflet.
=Once-compound.= A compound leaf bearing leaflets at the end or along the
sides of the main axis.
=Once-pinnate.= A compound leaf bearing leaflets along the sides of the
axis.
=Open sheath.= A leaf-sheath with separate margins.
=Opposite.= Situated in pairs on opposite sides of the stem or axis.
=Ovary.= The basal, usually swollen portion of the pistil, within which
the seeds are produced.
=Ovate.= Egg-shape in outline.
=Ovate-lanceolate.= Intermediate in shape between ovate and lanceolate;
broadly lanceolate or narrowly ovate.
=Ovate-oblong.= Intermediate in shape between ovate and oblong.
=Ovoid.= Egg-shape.
=Palmate.= With several organs or structures attached at or proceeding
from the same point; applied chiefly to the arrangement of
principal veins in a leaf and of leaflets in a compound leaf.
=Panicle.= A loose, more or less irregular, branching cluster of
pedicelled flowers, usually much longer than thick.
=Parallel-veined.= With the principal veins of the leaf paralleling each
other from the base to the apex, or (rarely) from the mid-rib to
the margin.
=Pedicel.= The stalk of a single flower.
=Parasite.= A plant which grows attached to another and derives its
nourishment from it.
=Peduncle.= The stalk of a flower-cluster, or of a solitary flower.
=Peltate.= Attached to the stalk by the lower surface, instead of the
margin.
=Perennial.= Living through several seasons.
=Perfect.= Bearing stamens and pistils in the same flower.
=Perfoliate.= Clasping the stem so completely that the stem seems to pass
through it.
=Perianth.= The calyx and corolla of a flower.
=Perigynium.= A sac-like structure surrounding the achene of a sedge.
=Persistent.= Remaining attached for a considerable time.
=Petal.= One member or segment of the corolla.
=Petiole.= The stalk of a leaf.
=Pinnate.= With several organs or structures attached at the sides of an
axis or stalk; applied chiefly to the arrangement of the principal
veins in a leaf and of leaflets in a compound leaf.
=Pinnatifid.= Deeply pinnately cut or divided.
=Pistil.= The central portion of a flower, consisting of ovary, style, and
stigma; the seed-bearing part of the flower.
=Pistillate.= Bearing pistils.
=Polygamous.= Applied to plants in which some flowers are perfect and
others either staminate or pistillate.
=Pubescent.= Hairy.
=Raceme.= A more or less elongated flower-cluster, bearing pedicelled
flowers along a single axis.
=Racemose.= Arranged in racemes.
=Receptacle.= The end of a peduncle or pedicel upon which the organs of a
flower, or the flowers of a head, are attached.
=Recurved.= Curved back.
=Reflexed.= Abruptly bent back or down.
=Regular.= Uniform in shape or structure. Flowers are generally considered
regular when all the petals are of the same size and shape.
=Retrorse.= Directed backward or downward.
=Revolute.= Rolled backward or under.
=Rootstock.= A horizontal subterranean stem, sending up leaves or stems.
=Rotate.= Wheel-shape; essentially flat and circular.
=Sac-like.= Inflated; sack-like.
=Sagittate.= Shaped like an arrow-head.
=Salver-form.= A corolla having a slender tube abruptly expanded at the
summit into a flat or spreading portion.
=Scape.= A peduncle arising directly from the base of the plant, leafless
or bearing bracts only.
=Segment.= One member or portion of an organ.
=Sepal.= One member or portion of the calyx.
=Serrate.= With sharp teeth at the margin.
=Serrulate.= Finely or minutely serrate.
=Sessile.= Without a stalk, petiole, or pedicel.
=Sheathing.= Inclosing.
=Simple.= In one piece; not compound; usually applied to leaves with a
single blade.
=Sinuate.= Wavy-margined.
=Sinus.= The angle between two lobes or divisions.
=Spadix.= A short fleshy spike.
=Spathe.= A large bract or pair of bracts enclosing a flower-cluster.
=Spatulate.= Shaped like a spatula, with a narrow base and an enlarged,
more or less rounded summit.
=Spike.= An elongated flower-cluster having sessile flowers upon an
unbranched axis.
=Spike-like.= Resembling a spike.
=Spinulose-serrate.= Provided with teeth tipped with minute spines.
=Spur.= A hollow projection from the calyx or corolla, usually slender in
shape, and generally directed backward.
=Stamen.= One of the organs of a flower, consisting of a filament and
anther.
=Staminate.= Bearing stamens.
=Stolon.= A short stem arising from the base of a plant, prostrate or
nearly so, and eventually taking root.
=Striate.= Marked with fine stripes or ridges.
=Style.= A portion of the pistil, usually slender, and connecting the
ovary and stigma.
=Superior.= A superior ovary occupies the center of the flower and is
not attached to any other floral organs.
=Subtending.= Situated at the base of an organ.
=Subulate.= Awl-shape.
=Ternately.= Divided by threes.
=Tomentose.= Densely hairy with matted or tangled hairs.
=Trifoliate.= With three leaflets.
=Truncate.= Cut straight across at the tip, or nearly so.
=Tube.= The more or less cylindrical portion of a gamosepalous calyx or
a gamopetalous corolla, distinguished from the expanded or lobed
terminal portion.
=Tubular.= Shaped like a tube.
=Twice-pinnate.= Same as bipinnate.
=Two-lipped.= A calyx or corolla in which the upper half is decidedly
different in size or shape from the lower.
=Umbel.= A flower-cluster with several or many pedicelled flowers all
arising from the same point.
=Undulate.= With a wavy margin.
=Viscid.= Sticky.
=Villous.= With long soft hairs.
=Whorl.= An arrangement of 3 or more leaves or flowers in a circle around
a node.
=Whorled.= In a whorl.
=Wing.= A thin flat expansion on the sides or edge of an organ.
INDEX
Abies, 1
Abutilon, 72
Acalypha, 66
Acanthaceae, 107
Acanthus Family, 107
Acer, 70
Aceraceae, 70
Acerates, 90
Achillea, 130, 131
Acnida, 30
Acorus, 8
Actaea, 39
Actinomeris, 128
Adder's Mouth, 17
Adenocaulon, 118
Adlumia, 41
Aesculus, 70
Agastache, 97
Agrimonia, 55
Agrimony, 55
Agropyron, 6
Agrostemma, 33
Agrostis, 6
Ailanthus, 65
Aizoaceae, 31
Alder, 22
Alder, Black, 69
Aletris, 13
Alfalfa, 61
Alisma, 3
Alismaceae, 3
Allium, 13
Alnus, 22
Alopecurus, 4
Alsike Clover, 61
Althaea, 72
Alum Root, 50, 51
Alyssum, 42, 46
Alyssum, Yellow, 42, 46
Amaranth Family, 30
Amaranthaceae, 30
Amaranthus, 30
Amaryllidaceae, 14
Amaryllis Family, 14
Ambrosia, 114
Amelanchier, 55
American Columbo, 88
American Ipecac, 57
Ammophila, 4
Amorpha, 58
Amphicarpa, 59
Anacardiaceae, 68
Anagallis, 87
Anaphalis, 120
Andromeda, 86
Andropogon, 5
Androsace, 87
Anemone, 38, 39
Anemone, Rue, 39
Anemone, Wood, 38
Anemonella, 39
Angelica, 82
Anonaceae, 40
Antennaria, 120
Anthemis, 130
Antirrhinum, 103
Anychia, 31
Apios, 58
Aplectrum, 16
Apocynaceae, 90
Apocynum, 90
Appalachian Cherry, 54
Apple, 54
Apple of Peru, 101
Aquifoliaceae, 69
Aquilegia, 36
Arabis, 46, 47
Araceae, 8
Aralia, 80
Araliaceae, 80
Arbutus, Trailing, 85
Arceuthobium, 25
Arctium, 117
Arctostaphylos, 85
Arenaria, 32
Arethusa, 16
Arisaema, 8
Aristolochia, 25
Aristolochiaceae, 25
Arnica, 123
Arrow Arum, 9
Arrow Grass, 3
Arrow Grass Family, 3
Arrow-head, 3
Arrow Wood, 111
Artemisia, 119
Artichoke, Jerusalem, 129
Arum Family, 8
Asarum, 25
Asclepias, 90, 91
Asclepiadaceae, 90
Ash, 88
Ash, Mountain, 52
Ash, Prickly, 65
Asimina, 40
Asparagus, 10
Aspen, 19
Aster, 132-134
Atriplex, 29
Avena, 6
Avens, 56, 57
Baby's Breath, 34
Balm of Gilead, 19
Balsam, 1
Balsam Poplar, 19
Balsaminaceae, 71
Baneberry, 39
Baptisia, 61
Barbarea, 44
Barberry, 40
Barberry Family, 40
Barnyard Grass, 5
Barren Strawberry, 55
Bartonia, 88
Basil, 97
Basil-thyme, 97
Basswood, 72
Bayberry, 21
Beach Grass, 4
Beach Pea, 59
Beaked Hazel, 22
Bearberry, 85
Beard Grass, 5
Beard-tongue, 104
Bedstraw, 108, 109
Beech, 22
Beech Drops, 84, 106
Beech Family, 22
Beggar Lice, 94
Beggar Ticks, 124
Bellflower, 112
Bellflower Family, 112
Bellwort, 12
Benzoin, 41
Berberidaceae, 40
Berberis, 40
Bergamot Mint, 98
Berula, 81
Betula, 21, 22
Betulaceae, 21
Bidens, 123, 124
Bilberry, 86, 87
Bindweed, 91, 92
Bindweed, Black, 28
Birch, 21, 22
Birch Family, 21
Bird-foot Violet, 75
Birthwort Family, 25
Bishop's Cap, 51
Bistort, 28
Bitter Cress, 45, 47
Bitter Dock, 26
Bitter Nut, 21
Bittersweet, 100
Bitter-sweet, 69
Black Alder, 69
Black Ash, 88
Blackberry, 53
Black Bindweed, 28
Black Cherry, 54
Black Currant, 49, 50
Black-eyed Susan, 128
Black Haw, 111
Black Jack Oak, 22
Black Locust, 58
Black Maple, 70
Black Medick, 60
Black Mustard, 44
Black Oak, 23
Black Raspberry, 53
Black Snakeroot, 82
Black Spruce, 1
Black Swallow-wort, 90
Black Walnut, 21
Black Willow, 20
Bladder Campion, 34
Bladder Nut, 69
Bladder Nut Family, 69
Bladderwort, 106
Bladderwort Family, 105
Blazing Star, 13, 121
Blephilia, 96
Blite, 29
Bloodroot, 41
Bloody Dock, 26
Blue Ash, 88
Bluebell, 93, 94
Blueberry, 86
Blue Cohosh, 40
Blue-eyed Grass, 15
Blue-eyed Mary, 104
Blue Flag, 15
Blue Grass, 7
Blue Hearts, 104
Blue-joint, 5
Bluets, 108
Blue Violet, 76
Blueweed, 94
Boehmeria, 24
Bog Rosemary, 86
Boltonia, 131
Boneset, False, 122
Borage, 93
Borage Family, 93
Boraginaceae, 93
Borago, 93
Bowman's Root, 57
Box Elder, 70
Brasenia, 35
Brassica, 43, 44
Brauneria, 131
Braya, 47
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
Convolvulus, 91, 92
Coptis, 39
Corallorhiza, 16
Coral Root, 16
Coreopsis, 123, 124
Corispermum, 28
Cork Elm, 24
Cornaceae, 83
Corn Cockle, 33
Corn Flower, 121
Corn Gromwell, 94
Corn Salad, 111
Cornus, 83, 84
Corydalis, 42
Corylus, 22
Costmary, 121
Cotton Grass, 8
Cotton Thistle, 118
Cottonwood, 19
Cowbane, 81
Cowherb, 34
Cow Parsnip, 82
Cowslip, 36
Cow Wheat, 104
Crab, 54
Crab Grass, 5
Crack Willow, 20
Cranberry, 85
Cranberry Tree, 111
Crane-fly Orchis, 16
Crane's-bill, 64, 65
Crassulaceae, 48
Creeping Cedar, 1
Creeping Wahoo, 69
Crepis, 117
Cress, 43-47
Cress, Bitter, 45, 47
Cress, Field, 46
Cress, Garden, 45, 46
Cress, Lake, 45, 46
Cress, Mouse-ear, 47
Cress, Penny, 46
Cress, Rock, 46, 47
Cress, Water, 45
Cress, Winter, 44
Cress, Yellow, 43
Crotalaria, 59
Crowberry, 68
Crowberry Family, 68
Crowfoot, 35
Crowfoot, Cursed, 37
Crowfoot Family, 35
Crowfoot, Sea-side, 36
Crowfoot, Small-flowered, 36
Crowfoot, Water, 35, 37
Cruciferae, 42
Cryptotaenia, 82
Cuckoo Flower, 45
Cucurbitaceae, 112
Cudweed, 120, 121
Culver's Root, 104
Cup Plant, 123
Currant, 49, 50
Currant, Indian, 110
Cursed Crowfoot, 37
Cuscuta, 92
Custard Apple Family, 40
Cut-grass, 5
Cycloloma, 29
Cynanchum, 90
Cynoglossum, 93, 94
Cynthia, 115
Cyperaceae, 7
Cyperus, 8
Cypress Spurge, 67
Cypripedium, 18
Dactylis, 6
Daisy, Ox-eye, 131
Dalibarda, 56
Dame's Rocket, 47
Dandelion, 115
Dandelion, Dwarf, 115
Datura, 100
Daucus, 82
Day-flower, 9
Day Lily, 11
Dead Nettle, 99
Decodon, 77
Deerberry, 86
Dentaria, 44
Deptford Pink, 34
Desmodium, 62, 63
Devil's Club, 80
Dewberry, 53
Dianthera, 107
Dianthus, 34
Dicentra, 41
Diervilla, 110
Digitaria, 5
Dioscorea, 14
Dioscoreaceae, 14
Diplotaxis, 42, 43
Dipsacaceae, 112
Dipsacus, 112
Dirca, 77
Ditch Stonecrop, 49
Dock, 26
Dock, Prairie, 122
Dodder, 92
Dodecatheon, 87
Dogbane, 90
Dogbane Family, 90
Dog Fennel, 130
Dog Rose, 52
Dog's-tooth Violet, 12
Dog Violet, 76
Dogwood, 83, 84
Dogwood Family, 83
Downy Mint, 78
Draba, 42, 46
Dracocephalum, 96
Dragon Head, 96
Dragon Head, False, 99
Dragon Root, 8
Drop-seed, 5
Drosera, 48
Droseraceae, 48
Duckweed, 9
Duckweed Family, 9
Dulichium, 7
Dutchman's Breeches, 41
Dwarf Birch, 22
Dwarf Dandelion, 115
Dwarf Dogwood, 83
Dwarf Ginseng, 80
Dwarf Iris, 15
Dwarf Mistletoe, 25
Dwarf Raspberry, 53
Dwarf Water Plantain, 3
Dwarf White Trillium, 12
Dyer's Greenweed, 58
Echinochloa, 5
Echinocystis, 112
Echinodorus, 3
Echinops, 117
Echium, 94
Eel Grass, 3
Elaeagnaceae, 77
Elatinaceae, 74
Elatine, 74
Elder, 109
Elder, Box, 70
Elder, Marsh, 114
Elecampane, 127
Eleocharis, 7
Eleusine, 6
Elm, 24
Elodea, 3
Elymus, 6
Empetraceae, 68
Empetrum, 68
Enchanter's Nightshade, 78
English Plantain, 107
Epifagus, 106
Epigaea, 85
Epilobium, 79
Epipactis, 17
Eragrostis, 7
Erechtites, 122
Ericaceae, 84
Erigenia, 81
Erigeron, 130-132
Eriocaulaceae, 9
Eriocaulon, 9
Eriophorum, 8
Erodium, 64
Eryngium, 80
Erysimum, 43
Erythronium, 12
Eupatorium, 121, 122
Euphorbia, 67, 68
Euphrasia, 102
Evening Primrose, 78
Evening Primrose Family, 78
Everlasting, 120
Everlasting, Pearly, 120
Evonymus, 69
Eyebright, 102
Fagaceae, 22
Fagopyrum, 27
Fagus, 22
Fall Dandelion, 115
False Asphodel, 14
False Boneset, 122
False Buckwheat, 28
False Dragon Head, 99
False Flax, 42
False Foxglove, 102
False Gromwell, 93
False Heather, 74
False Loosestrife, 78
False Mermaid, 68
False Mermaid Family, 68
False Mitrewort, 51
False Nettle, 24
False Pimpernel, 104
False Solomon's Seal, 14
Fatsia, 80
Fennel, 81
Fennel, Dog, 130
Fescue Grass, 7
Festuca, 7
Feverfew, 130
Feverwort, 109
Field Cress, 46
Field Garlic, 13
Figwort, 103
Figwort Family, 101
Filipendula, 57
Fire Pink, 33
Fireweed, 79, 122
Five-finger, 55
Flax, 63
Flax, False, 42
Flax Family, 63
Fleabane, 131, 132
Floating Foxtail, 4
Floating Heart, 88
Floerkea, 68
Flowering Dogwood, 83
Flowering Raspberry, 54
Flowering Wintergreen, 65
Flower-of-an-hour, 72
Foeniculum, 81
Fog Fruit, 99
Forget-me-not, 94
Forked Chickweed, 31
Four-o'Clock Family, 31
Foxglove, False, 102
Fox Grape, 72
Foxtail, 4
Foxtail, Floating, 4
Fragaria, 56
Frasera, 88
Fraxinus, 88
Fringed Gentian, 89
Fringed Orchis, 19
Frog's Bit Family, 3
Frost Grape, 72
Frostweed, 74
Fumaria, 42
Fumariaceae, 41
Fumitory, 42
Fumitory, Climbing, 41
Fumitory Family, 41
Galeopsis, 99
Gale, Sweet, 21
Galinsoga, 130
Galium, 108, 109
Garden Cress, 45, 46
Garden Phlox, 92
Garlic, Field, 13
Gaultheria, 86
Gaura, 79
Gaylussacia, 86
Genista, 58
Gentian, 89
Gentiana, 89
Gentianaceae, 88
Gentian Family, 88
Gentian, Spurred, 89
Geraniaceae, 64
Geranium, 64, 65
Geranium Family, 64
Gerardia, 102, 103
Geum, 56, 57
Giant Hyssop, 97
Giant Ragweed, 114
Gillenia, 57
Ginseng, 80
Gleditsia, 58
Globe-flower, 36
Globe Thistle, 117
Glyceria, 7
Gnaphalium, 120, 121
Goat's Rue, 60
Golden Alexander, 81
Golden Currant, 49
Golden Glow, 128
Goldenrod, 125-127
Golden Saxifrage, 50
Golden Seal, 38
Gold-thread, 39
Good King Henry, 29
Gooseberry, 49
Goosefoot, 28, 29
Goosefoot Family, 28
Gourd Family, 112
Gramineae, 4
Grape, 72
Grape Family, 71
Grape Hyacinth, 14
Grass Family, 4
Grass of Parnassus, 50
Grass, Star, 14
Gratiola, 104
Gray-headed Coneflower, 128
Great Lobelia, 113
Great Solomon's Seal, 11
Great-spurred Violet, 75
Greek Valerian, 92
Green Ash, 88
Green Brier, 11
Green Foxtail, 4
Green Milkweed, 90
Green Sorrel, 25
Green Violet, 75
Grindelia, 128
Ground Cherry, 101
Ground Hemlock, 2
Ground Ivy, 98
Groundsel, 128
Gum Plant, 128
Gymnocladus, 58
Gypsophila, 34
Gypsophyll, 34
Habenaria, 18, 19
Hackberry, 24
Hair Grass, 6
Halenia, 89
Haloragidaceae, 79
Hamamelidaceae, 51
Hamamelis, 51
Hand-leaf Violet, 75
Harbinger of Spring, 81
Hardhack, 53
Harebell, 112
Hare's Ear, 42
Hawksbeard, 117
Hawkweed, 116, 117
Hazel, 22
Heather, False, 74
Heath Family, 84
Hedeoma, 95
Hedge Hyssop, 104
Hedge Mustard, 44
Hedge Nettle, 99
Helenium, 127, 128
Helianthemum, 74
Helianthus, 128-130
Heliopsis, 123
Hemerocallis, 11
Hemlock, 1
Hemlock, Ground, 2
Hemlock Parsley, 83
Hemlock, Poison, 83
Hemlock, Water, 82
Hemp, 24
Hemp, Indian, 90
Hemp Nettle, 99
Hemp, Water, 30
Hemp Weed, 131
Henbane, 101
Hepatica, 38
Heracleum, 82
Herb Robert, 64
Herb Sophia, 43
Hercules' Club, 80
Hesperis, 47
Heteranthera, 10
Heuchera, 50, 51
Hibiscus, 72
Hickory, 21
Hieracium, 116, 117
Hill's Oak, 23
Hippuris, 79
Hoarhound, 96
Hoarhound, Water, 95
Hobble-bush, 111
Hog Peanut, 59
Holly Family, 69
Holly, Mountain, 69
Honewort, 82
Honey Locust, 58
Honeysuckle, 110
Honeysuckle, Bush, 110
Honeysuckle Family, 109
Hop, 24
Hop Clover, 60
Hop Tree, 65
Hordeum, 4
Hornbeam, 21
Horned Pondweed, 2
Hornwort, 34
Hornwort Family, 34
Horse Balm, 95
Horse Chestnut, 70
Horse Mint, 96
Horse Nettle, 100
Horse Radish, 46
Horse Weed, 130, 131
Hound's Tongue, 93
Houstonia, 108
Huckleberry, 86
Hudsonia, 74
Humulus, 24
Hyacinth, Wild, 14
Hybanthus, 75
Hydrocharitaceae, 3
Hydrocotyle, 80
Hydrophyllaceae, 93
Hydrophyllum, 93
Hyoscyamus, 101
Hypericaceae, 73
Hypericum, 73, 74
Hypoxis, 14
Hyssop, 98
Hyssop, Hedge, 104
Hyssopus, 98
Ilex, 69
Illecebraceae, 31
Ilysanthes, 104
Impatiens, 71
Imperatoria, 82
Indian Cucumber-root, 13
Indian Currant, 110
Indian Hemp, 90
Indian Mustard, 44
Indian Pipe, 84
Indian Plantain, 122
Indian Tobacco, 113
Indian Turnip, 8
Indigo, Wild, 61
Inula, 127
Ipomoea, 92
Iridaceae, 15
Iris, 15
Iris Family, 15
Ironweed, 122
Ironweed, Yellow, 128
Ironwood, 22
Isopyrum, 39
Iva, 114
Jack Pine, 1
Jeffersonia, 40
Jerusalem Artichoke, 129
Jerusalem Oak, 29
Jimson Weed, 100
Joe-Pye Weed, 122
Jointweed, 27
Juglandaceae, 21
Juglans, 21
Juncaceae, 10
Juncaginaceae, 3
Juncus, 10
Juneberry, 55
Juniper, 1
Juniperus, 1
Kalmia, 85
Kenilworth Ivy, 103
Kentucky Coffee-tree, 58
King-nut Hickory, 21
Knapweed, 121
Knawel, 31
Knotweed, 26, 27
Knotwort Family, 31
Kochia, 28
Koeleria, 6
Krigia, 115
Kuhnia, 122
Labiatae, 95
Labrador Tea, 85
Lactuca, 115, 116
Ladies' Tresses, 16
Lady's Slipper, 18
Lake Cress, 45, 46
Lamb's Quarters, 29
Lamium, 99
Laportea, 24
Lappula, 94
Lapsana, 115
Large-toothed Aspen, 19
Larix, 1
Larkspur, 36
Lathyrus, 59
Lauraceae, 41
Laurel Family, 41
Lead Plant, 58
Leafcup, 123
Leatherleaf, 86