Ap
- Apera
- X Apera interrupta — dense silky bentgrass, interrupted bentgrass, interrupted windgrass
- X Apera spica-venti — silky bentgrass
- Apios
- N Apios americana — American groundnut, Indian potato, wild bean, potato-bean
- Aplectrum
- N Aplectrum hyemale — puttyroot
- Apocynum
- N Apocynum androsaemifolium — spreading dogbane
- N Apocynum cannabinum — Indian hemp, clasping-leaf dogbane, prairie dogbane, velvet dogbane, amyroot
- N Apocynum sibiricum — clasping-leaved dogbane
- N Apocynum × floribundum (A. androsaemifolium × A. cannabinum) — intermediate dogbane, bitter dogbane
Read more about this topic: List Of Canadian Plants By Genus