| Family |
Taxon |
Common Name | Photographs |
| Malvaceae |
Abutilon theophrasti Medik. |
piemarker, velvet-leaf |
|
| Euphorbiaceae |
Acalypha rhomboidea Raf. |
rhombic copper-leaf, three-seeded-mercury |
|
| Aceraceae |
Acer negundo L. |
ash-leaved maple, box elder |
|
| Aceraceae |
Acer negundo L. var. negundo |
box elder |
|
| Asteraceae |
Achillea millefolium L. |
common yarrow, milfoil |
|
| Asteraceae |
Achillea millefolium L. subsp. lanulosa (Nutt.) Piper |
common yarrow, milfoil |
|
| Ranunculaceae |
Actaea rubra (Aiton) Willd. |
red baneberry |
|
| Rosaceae |
Agrimonia gryposepala Wallr. |
common agrimony, tall hairy agrimony |
|
| Caryophyllaceae |
Agrostemma githago L. var. githago |
corn cockle |
|
| Malvaceae |
Alcea rosea L. |
hollyhock |
|
| Alismataceae |
Alisma triviale Pursh |
northern water-plantain |
|
| Liliaceae |
Allium canadense L. var. canadense |
meadow garlic, wild garlic, wild onion |
|
| Amaranthaceae |
Amaranthus retroflexus L. |
common amaranth, pigweed, redroot, rough amaranth, rough pigweed, wild-beet amaranth |
|
| Asteraceae |
Ambrosia artemisiifolia L. |
annual bur-sage, common ragweed, short ragweed |
|
| Asteraceae |
Ambrosia trifida L. var. trifida |
giant ragweed, great ragweed, horse-cane |
|
| Rosaceae |
Amelanchier laevis Wiegand |
Allegheny serviceberry, Allegheny shadblow, smooth serviceberry |
|
| Rosaceae |
Amelanchier sanguinea (Pursh) DC. var. sanguinea |
low shadblow, New England serviceberry, round-leaved serviceberry |
|
| Rosaceae |
Amelanchier spicata (Lam.) K.Koch |
dwarf serviceberry |
|
| Fabaceae |
Amorpha canescens Pursh |
lead-plant |
|
| Fabaceae |
Amorpha fruticosa L. |
desert indigo-bush, false indigo, indigo-bush |
|
| Primulaceae |
Anagallis arvensis L. |
common pimpernel, scarlet pimpernel |
|
| Asteraceae |
Anaphalis margaritacea (L.) Benth. & Hook.f. |
pearly everlasting, western pearly everlasting |
|
| Ranunculaceae |
Anemone acutiloba (DC.) G.Lawson |
sharp-lobed hepatica |
|
| Ranunculaceae |
Anemone americana (DC.) H.Hara |
round-lobed hepatica |
|
| Ranunculaceae |
Anemone canadensis L. |
Canada anemone, Canadian anemone, meadow anemone |
|
| Ranunculaceae |
Anemone cylindrica A.Gray |
candle anemone, long-headed anemone, thimbleweed |
|
| Ranunculaceae |
Anemone patens L. var. multifida Pritz. |
American pasqueflower, prairie-smoke |
|
| Ranunculaceae |
Anemone quinquefolia L. var. quinquefolia |
nightcaps, wood anemone |
|
| Ranunculaceae |
Anemone virginiana L. |
tall anemone, tall thimbleweed |
|
| Ranunculaceae |
Anemone virginiana L. var. alba (Oakes) A.W.Wood |
tall anemone, thimbleweed |
|
| Ranunculaceae |
Anemone virginiana L. var. virginiana |
tall anemone, tall thimbleweed |
|
| Asteraceae |
Antennaria neglecta Greene |
cat's-foot, field pussy-toes |
|
| Asteraceae |
Antennaria parlinii Fernald |
Parlin's pussy-toes, plantain pussy-toes |
|
| Asteraceae |
Antennaria parlinii Fernald subsp. fallax (Greene) R.J.Bayer & Stebbins |
Parlin's pussy-toes, plantain pussy-toes |
|
| Asteraceae |
Anthemis cotula L. |
dog-fennel, mayweed, stinking chamomile, stinking-cotula |
|
| Fabaceae |
Apios americana Medik. |
common groundnut, Indian-potato, potato-bean |
|
| Apocynaceae |
Apocynum sibiricum Jacq. |
clasping dogbane, Indian hemp |
|
| Ranunculaceae |
Aquilegia canadensis L. |
Canadian columbine, red columbine, wild columbine |
|
| Brassicaceae |
Arabis canadensis L. |
sickle-pod |
|
| Brassicaceae |
Arabis hirsuta (L.) Scop. |
hairy rock-cress |
|
| Brassicaceae |
Arabis hirsuta (L.) Scop. var. adpressipilis (M.Hopkins) Rollins |
hairy rock-cress |
|
| Brassicaceae |
Arabis hirsuta (L.) Scop. var. pycnocarpa (M.Hopkins) Rollins |
cream-flower rock-cress, hairy rock-cress |
|
| Brassicaceae |
Arabis laevigata (Muhl. ex Willd.) Poir. var. laevigata |
smooth bank-cress, smooth rock-cress |
|
| Araliaceae |
Aralia elata (Miq.) Seem. |
Hercules-club |
|
| Araliaceae |
Aralia nudicaulis L. |
wild sarsaparilla |
|
| Araliaceae |
Aralia racemosa L. |
American spikenard, life-of-man |
|
| Araceae |
Arisaema triphyllum (L.) Schott subsp. triphyllum |
Indian turnip, Jack-in-the-pulpit |
|
| Asteraceae |
Artemisia dracunculus L. |
dragon sage-wort, dragon wormwood, estragon, false tarragon |
|
| Asteraceae |
Artemisia serrata Nutt. |
saw-leaf mugwort, saw-toothed sagebrush, saw-tooth wormwood, toothed sage |
|
| Asteraceae |
Artemisia vulgaris L. |
common wormwood, mugwort, sage-wort |
|