| Taxon |
Family |
Common Name |
Photograph |
| Acalypha gracilens A.Gray subsp. gracilens |
Euphorbiaceae |
short-stalk copper-leaf, slender three-seeded-mercury |
|
| Achillea millefolium L. |
Asteraceae |
common yarrow, milfoil |
|
| Achillea millefolium L. subsp. lanulosa (Nutt.) Piper |
Asteraceae |
common yarrow, milfoil |
|
| Achillea millefolium L. subsp. millefolium |
Asteraceae |
common yarrow, milfoil |
|
| Agalinis aspera (Douglas ex Benth.) Britton |
Scrophulariaceae |
rough agalinis, rough false foxglove, tall false foxglove |
|
| Agalinis gattingeri (Small) Small |
Scrophulariaceae |
round-stem foxglove, round-stemmed false foxglove |
|
| Agalinis purpurea (L.) Pennell |
Scrophulariaceae |
purple false foxglove, smooth agalinis |
|
| Agalinis skinneriana (A.W.Wood) Britton |
Scrophulariaceae |
pale false foxglove, Skinner's false foxglove |
|
| Agalinis tenuifolia (Vahl) Raf. |
Scrophulariaceae |
common agalinis, common false foxglove |
|
| Agastache scrophulariaefolia (Willd.) Kuntze |
Lamiaceae |
figwort giant hyssop, purple giant hyssop |
|
| Agrostemma githago L. var. githago |
Caryophyllaceae |
corn cockle |
|
| Alcea rosea L. |
Malvaceae |
hollyhock |
|
| Allium canadense L. var. canadense |
Liliaceae |
meadow garlic, wild garlic, wild onion |
|
| Allium cernuum Roth |
Liliaceae |
nodding wild onion |
|
| Allium schoenoprasum L. |
Liliaceae |
chives |
|
| Allium stellatum Ker Gawl. |
Liliaceae |
Autumn onion, prairie onion, wild onion |
|
| Althaea officinalis L. |
Malvaceae |
common marsh mallow |
|
| Amaranthus caudatus L. |
Amaranthaceae |
foxtail amaranth, love-lies-bleeding, purple amaranth |
|
| Amaranthus caudatus L. X A. hybridus L. |
Amaranthaceae |
|
|
| Amaranthus cruentus L. |
Amaranthaceae |
blood amaranth, caterpillar amaranth, purple amaranth, red amaranth |
|
| Amaranthus hypochondriacus L. |
Amaranthaceae |
prince's-feather, prince's-feather amaranth, Prince-of-Wales'-feather |
|
| Amaranthus tuberculatus (Moq.) J.D.Sauer |
Amaranthaceae |
rough-fruited amaranth, rough-fruited water-hemp, tall water-hemp |
|
| Amerorchis rotundifolia (Banks ex Pursh) Hultén |
Orchidaceae |
round-leaved orchid, round-leaved orchis |
|
| Ammannia robusta Heer & Regel |
Lythraceae |
grand red-stem, sessile tooth-cup |
|
| Anagallis arvensis L. |
Primulaceae |
common pimpernel, scarlet pimpernel |
|
| Anchusa officinalis L. |
Boraginaceae |
common alkanet, common bugloss |
|
| Anemone acutiloba (DC.) G.Lawson |
Ranunculaceae |
sharp-lobed hepatica |
|
| Anemone americana (DC.) H.Hara |
Ranunculaceae |
round-lobed hepatica |
|
| Anthyllis vulneraria L. subsp. vulneraria |
Fabaceae |
common kidney-vetch, woundwort |
|
| Antirrhinum majus L. |
Scrophulariaceae |
common snapdragon, garden snapdragon |
|
| Aplectrum hyemale (Muhl. ex Willd.) Torr. |
Orchidaceae |
Adam-and-Eve, putty-root |
|
| Apocynum androsaemifolium L. |
Apocynaceae |
spreading dogbane |
|
| Aquilegia canadensis L. |
Ranunculaceae |
Canadian columbine, red columbine, wild columbine |
|
| Aquilegia vulgaris L. |
Ranunculaceae |
European columbine, garden columbine |
|
| Arabis caucasica Willd. |
Brassicaceae |
gray rock-cress, wall rock-cress |
|
| Arctium lappa L. |
Asteraceae |
great burdock |
|
| Arctium minus Bernh. |
Asteraceae |
common burdock, lesser burdock |
|
| Arctium tomentosum Mill. |
Asteraceae |
cotton burdock, hairy burdock, woolly burdock |
|
| Arethusa bulbosa L. |
Orchidaceae |
dragon's-mouth, swamp-pink |
|
| Arisaema triphyllum (L.) Schott subsp. triphyllum |
Araceae |
Indian turnip, Jack-in-the-pulpit |
|
| Asarum canadense L. |
Aristolochiaceae |
Canadian wild-ginger, wild-ginger |
|
| Asclepias amplexicaulis Sm. |
Asclepiadaceae |
clasping milkweed, sand milkweed |
|
| Asclepias incarnata L. subsp. incarnata |
Asclepiadaceae |
swamp milkweed |
|
| Asclepias ovalifolia Decne. |
Asclepiadaceae |
dwarf milkweed, oval milkweed, oval-leaved milkweed |
|
| Asclepias purpurascens L. |
Asclepiadaceae |
purple milkweed |
|
| Asclepias speciosa Torr. |
Asclepiadaceae |
showy milkweed |
|
| Asclepias sullivantii Engelm. ex A.Gray |
Asclepiadaceae |
prairie milkweed, smooth milkweed, Sullivant's milkweed |
|
| Asclepias syriaca L. |
Asclepiadaceae |
common milkweed, silkweed |
|
| Aster novae-angliae L. |
Asteraceae |
New England aster |
|
| Blephilia ciliata (L.) Benth. |
Lamiaceae |
downy pagoda-plant, downy wood mint, Ohio horsemint |
|