- Adder's Tongue (Dogtooth Violet)
- Agrimony
- Alfalfa
- Allegheny Stonecrop
- Alumroot, Common
- Alumroot, Maple-leaved
- American Brooklime
- American Chestnut
- American Pennyroyal
- American Plantain
- Angelica, Mountain
- Appalachian Phacelia
- Arrowhead, Common
- Arrowwood, Southern
- Asiatic Dayflower
- Aster, Big-leaf
- Aster, Broad-leaved Golden
- Aster, Bushy
- Aster, Calico
- Aster, Crooked-stem
- Aster, Flat-topped White
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- Aster, Heart-leaved
- Aster, Heath
- Aster, Lowerie's
- Aster, Millboro
- Aster, New England
- Aster, Panicled
- Aster, Parasol
- Aster, Purple-stemmed or Bristly
- Aster, Rough-leaved
- Aster, Smooth
- Aster, Stiff
- Aster, Toothed White-topped
- Aster, Upland White
- Aster, White Wood
- Aster, Whorled
- Autumn Olive
- Azalea, Flame
- Azalea, Pink
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