The distinction of Native and Non-native species is sometimes not clearcut. For the purposes of this website various sources are used, such as Newcombe's Wildflower Guide and other authoritative books. Generally speaking, a species is considered to be non-native if it did not occur in the region covered by this website prior to the arrival of Europeans. But there may be exceptions.
Non-native species are also often referred to as "Alien" species.
The distinction between Native and Non-native species is important because many Non-native species are invasive and alter the ecosystem of an area. They may crowd out native plants. Animals, not being familiar with the foreign plants, frequently will not use them for food or even shelter. So the impact of the Non-native species extends well past their simple presence in an area.
For more information about Non-native species, please visit the Earth Caretaker website.

This is a list of Non-Native species found on this site, in order by the Common Name that is used for each species on this site. Click Here for a list of Native Species.

To see all Non-Native Plants in order by Common Name → START HERE

Aconite, Winter (Eranthis hyemalis)
Alfalfa (Medicago sativa)
Alyssum, Hoary (Berteroa incana)
Apple-of-Peru (Nicandra physalodes)
Archangel, Yellow (Lamiastrum galeobdolon)
Asparagus (Asparagus officinalis)
Avens, Wood (Geum urbanum)
Bedstraw, Yellow (Galium verum)
Bellflower, Clustered (Campanula glomerata)
Bellflower, Creeping (Campanula rapunculoides)
Bindweed, Eurasian Black (Fallopia convolvulus)
Bindweed, Field (Convolvulus arvensis)
Blanket Flower, Showy (Gaillardia pulchella)
Burnet, Small (Poterium sanguisorba)
Butter-and-eggs (Linaria vulgaris)
Butterbur (Petasites japonicus)
Campion, Bladder (Silene vulgaris)
Campion, Red (Lychnis dioica)
Campion, White (Silene latifolia)
Cancerwort, Roundleaf (Kickxia spuria)
Cancerwort, Sharpleaf (Kickxia elatine)
Carrot, Wild (Daucus carota)
Catchfly, Night-flowering (Silene noctiflora)
Catnip (Nepeta cataria)
Celandine (Chelidonium majus)
Celandine, Lesser (Ficaria verna)
Centaury (Centaurium erythraea)
Chervil, Wild (Anthriscus sylvestris)
Chickweed, Mouse-ear (Cerastium fontanum)
Chicory (Cichorium intybus)
Chives (Allium schoenoprasum)
Coltsfoot (Tussilago farfara)
Cowslip (Primula veris)
Cress, Hairy Bitter (Cardamine hirsuta)
Cress, Mouse Ear (Arabidopsis thaliana)
Crocus (Crocus vernus)
Crowfoot, Small Yellow Water (Ranunculus gmelinii)
Daffodil (Narcissus pseudonarcissus)
Daisy, English (Bellis perennis)
Daisy, Oxeye (Leucanthemum vulgare)
Dandelion, Common (Taraxacum officinale)
Elecampane (Inula helenium)
Frogbit (Hydrocharis morsus-ranae)
Hedge Parsley, Japanese (Torilis japonica)
Helleborine (Epipactis helleborine)
Hemlock, Poison (Conium maculatum)
Himalayan Balsam (Impatiens glandulifera)
Hyacinth, Grape (Muscari botryoides)
Iris, Yellow (Iris pseudacorus)
Ivy, Ground (Glechoma hederacea)
Knotweed, Japanese (Fallopia japonica)
Lamb's Quarters (Chenopodium album)
Loosestrife, Purple (Lythrum salicaria)
Medick, Black (Medicago lupulina)
Mignonette, Yellow Upright (Reseda lutea)
Mullein, Common (Verbascum thapsus)
Mullein, Dark (Verbascum nigrum)
Mullein, Moth (Verbascum blattaria)
Mustard, Garlic (Alliaria petiolata)
Nipplewort (Lapsana communis)
Pansy, Field (Viola bicolor)
Periwinkle (Vinca minor)
Purslane (Portulaca oleracea)
Purslane, Milk (Euphorbia maculata)
Ragged Robin (Silene flos-cuculi)
Rhubarb (Rheum rhabarbarum)
Rocket, Dame's (Hesperis matronalis)
Rocket, Yellow (Barbarea vulgaris)
Saltwort, Common (Salsola tragus)
Scilla (Scilla siberica)
Shepherd's Purse (Capsella bursa-pastoris)
Snapdragon, Dwarf (Chaenorrhinum minus)
Snow in Summer (Cerastium tomentosum)
Snowdrops (Galanthus nivalis)
Speedwell, Bird's-eye (Veronica chamaedrys)
Speedwell, Persian (Veronica persica)
Speedwell, Thyme-leaved (Veronica serpyllifolia)
Spurge, Cypress (Euphorbia cyparissias)
Star-of-Bethlehem (Ornithogalum umbellatum)
Stonecrop, Mossy (Sedum acre)
Strawberry, Indian (Potentilla indica)
Sunflower, Maximilian (Helianthus maximilianii)
Swallowwort, Black (Cynanchum louiseae)
Swallowwort, Pale (Cynanchum rossicum)
Swallowwort, White (Cynanchum vincetoxicum)
Tansy (Tanacetum vulgare)
Teasel (Dipsacus fullonum)
Thistle, Bull (Cirsium vulgare)
Thistle, Canada (Cirsium arvense)
Thistle, Globe (Echinops sphaerocephalus)
Thistle, Nodding (Carduus nutans)
Toadflax, Dalmation (Linaria dalmatica)
Trefoil, Birdsfoot (Lotus corniculatus)
Tulip (Tulipa sylvestris)
Twayblade, European Common (Neottia ovata)
Velvetleaf (Abutilon theophrasti)
Vetchling, Yellow (Lathyrus pratensis)
Viper's Bugloss (Echium vulgare)
Whitlow Grass, Spring (Draba verna)
Woodruff, Sweet (Galium odoratum)
Yarrow (Achillea millefolium)
Yucca (Yucca filamentosa)

To see all Non-Native Plants in order by Common Name → START HERE