alder
buckthorn
|
Rhamnus
frangula |
alfalfa
|
Medicago
sativa |
aloe - A.
barbadensis
|
Aloe
barbadensis |
alsike
clover
|
Trifolium
hybridum |
amaryllis
(A. belledonna)
|
Amaryllis
belladonna |
amaryllis
(A. vittata)
|
Amaryllis
vittata |
American
elder
|
Sambucus
canadensis |
American
holly
|
Ilex opaca |
American
mistletoe
|
Phoradendron
flavescens |
angel's
trumpet
|
Datura innoxia |
Astragalus
(A. adsurgens)
|
Astragalus
adsurgens |
Astragalus
(A. lentiginosus)
|
Astragalus
lentiginosus |
Australian
umbrella tree
|
Brassaia
actinophylla |
autumn
crocus
|
Colchicum
autumnale |
avocado
|
Persea
americana |
bird rape
|
Brassica
campestris |
black
cherry
|
Prunus
serotina |
black
henbane
|
Hyoscyamus
niger |
black
locust
|
Robinia
pseudoacacia |
black
nightshade
|
Solanum nigrum |
black oak
|
Quercus
velutina |
black
walnut
|
Juglans nigra |
black-eyed
Susan
|
Rudbeckia
serotina |
blue
cardinalflower
|
Lobelia
siphilitica |
blue
cohosh
|
Caulophyllum
thalictroides |
blue
flag iris
|
Iris
versicolor |
blueweed
|
Echium vulgare |
bog-laurel
|
Kalmia
polifolia |
bracken
|
Pteridium
aquilinum |
broad
bean
|
Vicia faba |
broom
snakeweed
|
Gutierrezia
sarothrae |
buckwheat
|
Fagopyrum
esculentum |
bulbous
buttercup
|
Ranunculus
bulbosus |
bur
buttercup
|
Ceratocephalus
testiculatus |
Burke's
lupine
|
Lupinus burkei |
burningbush
|
Euonymus
atropurpureus |
caladium
|
Caladium
bicolor |
California
bluebell
|
Phacelia
campanularia |
California
rose-bay
|
Rhododendron
macrophyllum |
Canada
nettle
|
Laportea
canadensis |
Canada
yew
|
Taxus
canadensis |
Canadian
milk-vetch
|
Astragalus
canadensis |
candalabra
aloe
|
Aloe
arborescens |
candelabra-cactus
|
Euphorbia
lactea |
caper
spurge
|
Euphorbia
lathyris |
cardinalflower
|
Lobelia
cardinalis |
castor-bean
|
Ricinus
communis |
celery-leaved
buttercup
|
Ranunculus
sceleratus |
Chinese-lantern
|
Physalis
alkekengi |
chives
|
Allium
schoenoprasum |
chrysanthemum
|
Chrysanthemum
indicum |
climbing
nightshade
|
Solanum
dulcamara |
cocklebur
|
Xanthium
strumarium |
Colorado
rubberweed
|
Hymenoxys
richardsonii |
common
comfrey
|
Symphytum
officinale |
common
groundsel
|
Senecio
vulgaris |
common
hop
|
Humulus
lupulus |
common
milkweed
|
Asclepias
syriaca |
common
privet
|
Ligustrum
vulgare |
common
vetch
|
Vicia sativa |
corn
poppy
|
Papaver rhoeas |
croton
|
Codiaeum
variegatum |
crown-of-thorns
|
Euphorbia
milii |
cut-leaved
coneflower
|
Rudbeckia
laciniata |
cyclamen
|
Cyclamen
persicum |
cypress
spurge
|
Euphorbia
cyparissias |
daffodil
|
Narcissus
pseudonarcissus |
death
camas
|
Zigadenus
venenosus |
Devil's-backbone
|
Kalanchoe
daigremontiana |
dumbcane
|
Dieffenbachia
bausei |
Dutchman's-breeches
|
Dicentra
cucullaria |
eastern
whorled milkweed
|
Asclepias
verticillata |
English
bluebell
|
Hyacinthoides
nonscripta |
English
holly
|
Ilex
aquifolium |
English
ivy
|
Hedera helix |
English
yew
|
Taxus baccata |
entire-leaved
groundsel
|
Senecio
integerrimus |
European
buckthorn
|
Rhamnus
cathartica |
European
elder
|
Sambucus nigra |
European
spindletree
|
Euonymus
europaeus |
false
hellebore
|
Veratrum
viride |
false
ragweed
|
Iva
xanthifolia |
February
daphne
|
Daphne
mezereum |
fiddleneck
|
Amsinckia
intermedia |
field
horsetail
|
Equisetum
arvense |
five-hooked
bassia
|
Bassia
hyssopifolia |
flamingo
lily
|
Anthurium
andraeanum |
fly
honeysuckle
|
Lonicera
xylosteum |
foxglove
|
Digitalis
purpurea |
garden-sorrel
|
Rumex acetosa |
garland
daphne
|
Daphne cneorum |
garlic
|
Allium sativum |
gas plant
|
Dictamnus
albus |
giant
dumbcane
|
Dieffenbachia
amoena |
giant
hogweed
|
Heracleum
mantegazzianum |
glory
lily
|
Gloriosa
superba |
golden-bean
|
Thermopsis
rhombifolia |
golden-chain
|
Laburnum
anagyroides |
golden-trumpet
|
Allamanda
cathartica |
grass pea
|
Lathyrus
sativus |
greasewood
|
Sarcobatus
vermiculatus |
greater
celandine
|
Chelidonium
majus |
green
tansy mustard
|
Descurainia
pinnata |
ground-cherry
|
Physalis
peruviana |
ground-ivy
|
Glechoma
hederacea |
Guelder-rose
|
Viburnum
opulus |
hairy
vetch
|
Vicia villosa |
heart-leaved
philodendron
|
Philodendron
scandens |
hemp
dogbane
|
Apocynum
cannabinum |
horse-chestnut
|
Aesculus
hippocastanum |
horseradish
|
Armoracia
rusticana |
hound's
tongue
|
Cynoglossum
officinale |
hydrangea
|
Hydrangea
macrophylla |
Iceland
poppy
|
Papaver
nudicaule |
Indian
mustard
|
Brassica
juncea |
Indian-tobacco
|
Lobelia
inflata |
Jack-in-the-pulpit
|
Arisaema
triphyllum |
Japanese
wisteria
|
Wisteria
floribunda |
Japanese
yew
|
Taxus
cuspidata |
Jerusalem-cherry
|
Solanum
pseudocapsicum |
jimsonweed
|
Datura
stramonium |
Johnson
grass
|
Sorghum
halepense |
Kaffir
lily
|
Clivia miniata |
Kentucky
coffeetree
|
Gymnocladus
dioicus |
kochia
|
Kochia
scoparia |
lamb's-quarters
|
Chenopodium
album |
large-leaved
lupine
|
Lupinus
polyphyllus |
leafy
spurge
|
Euphorbia
esula |
leatherwood
|
Dirca
palustris |
lily-of-the-valley
|
Convallaria
majalis |
locoweed (Oxytropis
sericea)
|
Oxytropis
sericea |
low
larkspur
|
Delphinium
bicolor |
maidenhair
tree
|
Ginkgo biloba |
mango
|
Mangifera
indica |
marijuana
|
Cannabis
sativa |
marsh
arrow-grass
|
Triglochin
palustre |
marsh
horsetail
|
Equisetum
palustre |
May-apple
|
Podophyllum
peltatum |
Menzies
larkspur
|
Delphinium
menziesii |
monk's
hood
|
Aconitum
napellus |
moonseed
|
Menispermum
canadense |
morning
glory
|
Ipomoea
tricolor |
mother-in-law
plant
|
Dieffenbachia
seguine |
motherwort
|
Leonurus
cardiaca |
naked-flowered
sneezeweed
|
Helenium
flexuosum |
narcissus
|
Narcissus
poeticus |
northern
water-hemlock
|
Cicuta virosa |
oats
|
Avena sativa |
Ohio
buckeye
|
Aesculus
glabra |
oleander
|
Nerium
oleander |
onion
|
Allium cepa |
opium
poppy
|
Papaver
somniferum |
Oriental
poppy
|
Papaver
orientale |
Osage-orange
|
Maclura
pomifera |
pawpaw
|
Asimina
triloba |
penciltree
|
Euphorbia
tirucalli |
Peruvian
lily
|
Alstroemeria
ligtu |
petty
spurge
|
Euphorbia
peplus |
philodendron
|
Philodendron
cordatum |
pin
cherry
|
Prunus
pensylvanica |
pink
lady's-slipper
|
Cypripedium
acaule |
poinsettia
|
Euphorbia
pulcherrima |
poison
ivy
|
Rhus radicans |
poison
suckleya
|
Suckleya
suckleyana |
poison
sumac
|
Rhus vernix |
poison-hemlock
|
Conium
maculatum |
pokeweed
|
Phytolacca
americana |
ponderosa
pine
|
Pinus
ponderosa |
potato
|
Solanum
tuberosum |
precatory-pea
|
Abrus
precatorius |
prickly
comfrey
|
Symphytum
asperum |
prickly
lettuce
|
Lactuca
scariola |
primula
|
Primula
obconica |
prostrate
pigweed
|
Amaranthus
blitoides |
purple
cockle
|
Agrostemma
githago |
purple
locoweed
|
Oxytropis
lambertii |
radish
|
Raphanus
sativus |
rapeseed
|
Brassica napus |
red
chokecherry
|
Prunus
virginiana |
red
clover
|
Trifolium
pratense |
red maple
|
Acer rubrum |
red oak
|
Quercus rubra |
redroot
pigweed
|
Amaranthus
retroflexus |
reed
canarygrass
|
Phalaris
arundinacea |
rhubarb
|
Rheum
rhaponticum |
Russian
knapweed
|
Centaurea
repens |
Saskatoon
(a serviceberry)
|
Amelanchier
alnifolia |
scarlet
pimpernel
|
Anagallis
arvensis |
seaside
arrow-grass
|
Triglochin
maritima |
sensitive
fern
|
Onoclea
sensibilis |
sheep
sorrel
|
Rumex
acetosella |
sheep-laurel
|
Kalmia
angustifolia |
showy
lady's-slipper
|
Cypripedium
reginae |
showy
milkweed
|
Asclepias
speciosa |
Siberian
scilla
|
Scilla
siberica |
silky
lupine
|
Lupinus
sericeus |
silvery
lupine
|
Lupinus
argenteus |
skunk
cabbage
|
Symplocarpus
foetidus |
small
lupine
|
Lupinus
pusillus |
smooth
pigweed
|
Amaranthus
hybridus |
sneezeweed
|
Helenium
autumnale |
snowdrop
|
Galanthus
nivalis |
Sorghum
|
Sorghum
bicolor |
spatulate-leaved
heliotrope
|
Heliotropium
curassavicum |
spotted
dumbcane
|
Dieffenbachia
maculata |
spotted
water-hemlock
|
Cicuta
maculata |
spreading
dogbane
|
Apocynum
androsaemifolium |
spurge-laurel
|
Daphne
laureola |
squirrel-corn
|
Dicentra
canadensis |
St.
John's-wort
|
Hypericum
perforatum |
star-of-Bethlehem
|
Ornithogalum
umbellatum |
stinging
nettle
|
Urtica dioica |
stinking
rabbitbrush
|
Chrysothamnus
nauseosus |
stinkweed
|
Thlaspi
arvense |
Sudan
grass
|
Sorghum
sudanense |
sun
spurge
|
Euphorbia
helioscopia |
sunflower
|
Helianthus
annuus |
sweet
pea
|
Lathyrus
odoratus |
Swiss-cheese
plant
|
Monstera
deliciosa |
tall
larkspur
|
Delphinium
glaucum |
tall
manna grass
|
Glyceria
grandis |
tansy
|
Tanacetum
vulgare |
tansy
ragwort
|
Senecio
jacobaea |
Tartarian
honeysuckle
|
Lonicera
tatarica |
thin-leaved
snowberry
|
Symphoricarpos
albus |
timber
milk-vetch
|
Astragalus
miser |
tobacco
|
Nicotiana
tabacum |
tree-of-heaven
|
Ailanthus
altissima |
tulip
|
Tulipa
gesneriana |
two-grooved
milk-vetch
|
Astragalus
bisulcatus |
veined
dock
|
Rumex venosus |
velvety
goldenrod
|
Solidago
mollis |
Virginia
creeper
|
Parthenocissus
quinquefolia |
western
bleedingheart
|
Dicentra
formosa |
western
minniebush
|
Menziesia
ferruginea |
western
poison-oak
|
Rhus
diversiloba |
yellow
toadflax
|
Linaria
vulgaris |
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