United States

Arctic Butterbur

Petasites frigidus

Arctic Fingernailclam

Sphaerium nitidum

Arctic Forestfly

Nemoura arctica

Arctic Grayling

Oeneis bore

Arctic Kidney Lichen

Nephroma arcticum

Arctic Mushroom Scales Lichen

Lichenomphalia hudsoniana

Arctic Rocktripe Lichen

Umbilicaria arctica

Arctic Rush

Juncus arcticus

Arctic Saxifrage

Saxifraga hyperborea

Arctic Stag'S-Horn Clubmoss

Lycopodium lagopus

arctic threadwort

Cephaloziella varians

Arctic Wheatgrass

Elymus violaceus

Arcyria insignis

Arcyria stipata

Arcyria versicolor

Arethusa

Arethusa bulbosa

Argentine ant

Linepithema humile

Australian brake

Pteris tremula

Australian Bur-grass

Tragus australianus

Australian fingergrass

Chloris truncata

Australian Goosefoot

Dysphania pumilio

Australian lovegrass

Eragrostis leptostachya

Australian spider beetle

Ptinus tectus

Australian Spinach

Chenopodiastrum murale

Australian spotted jellyfish

Phyllorhiza punctata

Australian stork's bill

Erodium cygnorum

Australian teatree

Leptospermum laevigatum

Australian tubeworm

Ficopomatus enigmaticus

Australian waterbuttons

Cotula australis

Australian windmill grass

Chloris ventricosa

Austrian Yellow-cress

Rorippa austriaca

Autumnal Moth

Epirrita autumnata

Autumn Bent

Agrostis perennans

Autumn Clematis

Clematis terniflora

Autumn Crocus

Colchicum autumnale

Autumn fern

Dryopteris erythrosora

Autumn Hawkweed

Hieracium sabaudum

Autumn Willow

Salix serissima

Autumn zephyrlily

Zephyranthes candida

Avens

Geum urbanum

Avian goosefoot

Chenopodium hircinum

Avian malaria

Plasmodium relictum

Awkward Clusterfly

Pollenia rudis

Awl Aster

Symphyotrichum pilosum

Awl-Fruited Oval Sedge

Carex tribuloides

Awl-Fruited Sedge

Carex stipata

awl-leaved forklet moss

Dicranella subulata

Awlwort

Subularia aquatica

Awned Canary-grass

Phalaris paradoxa

Awned Cyperus

Cyperus squarrosus

Awnless Geranium

Geranium molle

Azalea lace bug

Stephanitis pyrioides

Azalea leafminer

Caloptilia azaleella

Azores buttercup

Ranunculus cortusifolius

Azulejo

Cornutia pyramidata

Azure Bluet

Enallagma aspersum

Azure Bluet

Houstonia caerulea

Baby blue eyes

Nemophila menziesii

Baby'S Breath

Galium sylvaticum

Bachelor'S-Button

Gomphrena globosa