Canada

Ajuga

Ajuga reptans

Endangered

Alder

Alnus glutinosa

Alexanders

Angelica atropurpurea

Allegheny Serviceberry

Amelanchier arborea

Common Silver Hairgrass

Aira caryophyllea

Endangered

All Species in Canada

Annual Knawel

Scleranthus annuus

Annual Marsh Fleabane

Pluchea odorata

Annual Mercury

Mercurialis annua

Annual rabbitsfoot grass

Polypogon monspeliensis

Annual Ragweed

Ambrosia artemisiifolia

Annual Sea-Blite

Suaeda maritima

Annual Wall-rocket

Diplotaxis muralis

Annual wheatgrass

Eremopyrum triticeum

Annual yellow sweetclover

Melilotus indicus

anoda-weed

Anoda cristata

Ant Beetle

Thanasimus formicarius

Anticosti Island aster

Symphyotrichum anticostense

Antirrhinum Beetle

Brachypterolus pulicarius

Antlike flower beetle

Omonadus formicarius

Aphid Trap

Proboscidea louisianica

Appalachian Barren Strawberry

Geum fragarioides

Appalachian Polypody

Polypodium appalachianum

Appalachian Quillwort

Isoetes engelmannii

Appalachian Tea

Ilex glabra

Apple

Malus domestica

Apple Capsid

Lygocoris rugicollis

Apple Of Peru

Nicandra physalodes

Aquatic Pygmyweed

Crassula aquatica

Vulnerable

arching bushweed

Flueggea suffruticosa

Arctic Alkali Grass

Puccinellia arctica

arctic-alpine fleabane

Erigeron humilis

Arctic Bentgrass

Agrostis mertensii

Arctic bladderpod

Physaria arctica

Arctic Burreed

Sparganium natans

arctic burreed

Sparganium hyperboreum

arctic draba

Draba arctica

Arctic Forestfly

Nemoura arctica

Arctic Fritillary

Boloria chariclea

arctic groundsel

Tephroseris frigida

arctic lupine

Lupinus arcticus

Arctic marsh sedge

Carex holostoma

Vulnerable

Arctic Mouse-Ear

Cerastium arcticum

arctic rockcress

Arabidopsis arenicola

arctic sandwort

Cherleria arctica

Arctic Saxifrage

Saxifraga hyperborea

Arctic Stag'S-Horn Clubmoss

Lycopodium lagopus

arctic starflower

Lysimachia europaea

arctic sweetgrass

Anthoxanthum arcticum

Arctic Wheatgrass

Elymus violaceus

Arctic willow

Salix arctica

arctic willowherb

Epilobium arcticum

arctic woodrush

Luzula nivalis

Endangered

Arethusa

Arethusa bulbosa

Argentina Vervain

Verbena bonariensis

Australian Goosefoot

Dysphania pumilio

Australian spider beetle

Ptinus tectus

Australian Spinach

Chenopodiastrum murale

Critically Endangered

Australian waterbuttons

Cotula australis

Austrian draba

Draba fladnizensis

Austrian flax

Linum austriacum

Austrian Yellow-cress

Rorippa austriaca

Autumnal Moth

Epirrita autumnata

Autumn Bent

Agrostis perennans

Autumn Berry

Elaeagnus umbellata

Autumn Clematis

Clematis terniflora