Ag
- Agalinis
- N Agalinis gattingeri — Gattinger's agalinis Endangered
- N Agalinis paupercula — small-flowered purple false-foxglove, small-flowered agalinis
- N Agalinis purpurea — purple false foxglove, large purple agalinis
- N Agalinis skinneriana — Skinner's agalinis Endangered
- N Agalinis tenuifolia — slenderleaf purple false foxglove, slenderleaf agalinis
- Agastache
- N Agastache foeniculum — anise hyssop, blue giant hyssop
- N Agastache nepetoides — yellow giant hyssop
- N Agastache scrophulariifolia — purple giant hyssop
- Agoseris
- N Agoseris glauca — pale false-dandelion, prairie agoseris, pale agoseris, pale goat-chicory, large-flowered false-dandelion
- Agrimonia
- X Agrimonia eupatoria — medicinal agrimony, church steeples, European groovebur
- N Agrimonia gryposepala — tall hairy agrimony, tall hairy groovebur
- N Agrimonia parviflora — smallflower groovebur, harvestlice agrimony
- N Agrimonia pubescens — soft groovebur, soft agrimony
- N Agrimonia striata — woodland agrimony, grooved agrimony
- Agropyron
- X Agropyron cristatum — crested wheatgrass
- Agrostemma
- X Agrostemma githago — common corncockle
- Agrostis
- ? Agrostis canina — brown bentgrass
- X Agrostis capillaris — colonial bentgrass, browntop, Prince Edward Island bentgrass, Rhode Island bentgrass
- X Agrostis gigantea — black bentgrass, redtop
- N Agrostis hyemalis — winter bentgrass, ticklegrass
- N Agrostis mertensii — northern bentgrass
- N Agrostis perennans — upland bentgrass, perennial bentgrass
- N Agrostis scabra — rough bentgrass, tickle grass, rough hairgrass, twin bentgrass
- N Agrostis stolonifera — creeping bentgrass, spreading bentgrass
Read more about this topic: List Of Canadian Plants By Genus