Alliaria X Alliaria petiolata – garlic mustard, hedge garlic Allium N Allium burdickii – narrow-leaved wild leek N Allium canadense – Canada wild onion, meadow garlic, meadow onion N Allium cernuum – nodding onion X Allium oleraceum – wild garlic X Allium sativum – garlic X Allium schoenoprasum var. schoenoprasum – chives N Allium schoenoprasum var. sibiricum – Siberian chives N Allium stellatum – prairie onion, wild onion N Allium tricoccum – wild leek, small wild leek, ramps X Allium vineale – field garlic Alnus X Alnus glutinosa – black alder, European alder N Alnus incana – grey alder, white alder, hoary alder, speckled alder N Alnus viridis – green alder, mountain alder, American green alder, Siberian alder, Sitka alder Alopecurus N Alopecurus aequalis – shortawn foxtail N Alopecurus alpinus – alpine foxtail X Alopecurus geniculatus – water foxtail X Alopecurus pratensis – meadow foxtail Althaea X Althaea hirsuta – hairy marsh-mallow X Althaea officinalis – common marsh-mallow Alyssum X Alyssum alyssoides – pale alyssum, small alyssum, yellow alyssum, pale madwort X Alyssum murale – yellow-tuft Am Amaranthus X Amaranthus albus – white tumbleweed, tumble pigweed, tumbleweed amaranth X Amaranthus blitoides – prostrate amaranth, prostrate pigweed, matweed X Amaranthus blitum – purple amaranth X Amaranthus cruentus – blood amaranth, purple amaranth, red amaranth, caterpillar amaranth, African spinach X Amaranthus hybridus – smooth amaranth, hybrid amaranth, green pigweed, smooth pigweed, green amaranth X Amaranthus palmeri – Palmer's amaranth X Amaranthus powellii – green amaranth, Powell's smooth amaranth X Amaranthus retroflexus – redroot amaranth, redroot pigweed, wild-beet amaranth, rough pigweed X Amaranthus spinosus – spiny amaranth N Amaranthus tuberculatus – roughfruit amaranth, roughfruit waterhemp, tall waterhemp, tall pigweed Ambrosia N Ambrosia artemisiifolia – common ragweed, annual ragweed, annual bur-sage N Ambrosia psilostachya – perennial ragweed, western ragweed, naked-spike ambrosia, Cuman ragweed N Ambrosia trifida – giant ragweed, great ragweed, buffalo-weed, skeleton-leaf bur-sage Amelanchier N Amelanchier alnifolia – Saskatoonberry, northwestern serviceberry N Amelanchier arborea – downy serviceberry, downy juneberry, common serviceberry N Amelanchier bartramiana – mountain juneberry, Bartram's shadbush, Bartram's chuckleypear N Amelanchier canadensis – Canada serviceberry, swamp shadbush, thicket serviceberry N Amelanchier humilis – low serviceberry, running serviceberry N Amelanchier laevis – smooth juneberry, Allegheny serviceberry, smooth chuckleypear N Amelanchier sanguinea var. gaspensis – Gaspé roundleaf juneberry N Amelanchier sanguinea var. sanguinea – roundleaf juneberry, roundleaf serviceberry, Fernald's chuckleypear N Amelanchier stolonifera – running serviceberry, running juneberry, running chuckleypear N Amelanchier ×