United States

Aconite

Aconitum napellus

Admiralty Island Meadow Vole (Admiraltiae)

Microtus pennsylvanicus

Agrimony

Agrimonia eupatoria

Near Threatened

Ajuga

Ajuga reptans

Endangered

Alder

Alnus glutinosa

Alder leaf beetle

Agelastica alni

Alder Spittlebug

Aphrophora alni

All Species in United States

Apothecary Rose

Rosa gallica

Appalaches Appalachian Speckled Shield Lichen

Punctelia appalachensis

Appalachian Barren Strawberry

Geum fragarioides

Appalachian Brook Crayfish

Cambarus bartonii

Appalachian Polypody

Polypodium appalachianum

Appalachian Quillwort

Isoetes engelmannii

Appalachian Shield Lichen

Parmelia neodiscordans

Appalachian Tea

Ilex glabra

Appalachian Tree Camouflage Lichen

Melanohalea halei

Apple

Malus domestica

Apple blossom

Cassia javanica

Applebox

Eucalyptus bridgesiana

Apple Canker

Neonectria ditissima

Apple fruit moth

Argyresthia conjugella

Apple leaf midge

Dasineura mali

Apple Leaf Skeletoniser

Choreutis pariana

apple mealybug

Phenacoccus aceris

Apple Mint

Mentha suaveolens

Apple Mint

Mentha villosa

Apple Of Peru

Nicandra physalodes

Apple Of Sodom

Solanum carolinense

Apple Pith Moth

Blastodacna atra

Apple Scab

Venturia inaequalis

Applesnail

Pila scutata

Apple sucker

Cacopsylla mali

Appressed Bog Clubmoss

Lycopodiella appressa

Apricot

Prunus armeniaca

Apricot Club

Clavulinopsis luteoalba

aquarium medusa

Cladonema radiatum

Aquatic oligochaete worm

Paranais frici

Aquatic oligochaete worm

Spirosperma ferox

Aquatic oligochaete worm

Propappus volki

Aquatic oligochaete worm

Gianius aquaedulcis

Aquatic oligochaete worm

Potamothrix bavaricus

Aquatic Pelt Lichen

Peltigera hydrothyria

Aquatic Pipewort

Eriocaulon aquaticum

Aquatic Pygmyweed

Crassula aquatica

Aquatic Sedge

Carex aquatilis

A Quilt Lichen

Fuscidea recensa

Arabian jasmine

Jasminum sambac

Arabian pea

Bituminaria bituminosa

Arabian schismus

Schismus arabicus

Arborescent angel's-tears

Brugmansia versicolor

Arborescent pricklypear

Opuntia leucotricha

Arborvitae Leafminer

Argyresthia thuiella

Arched Earthstar

Geastrum fornicatum

Arched Woodwax

Hygrophorus camarophyllus

Arctic-alpine Pea Clam

Euglesa conventus

Arctic Bentgrass

Agrostis mertensii

Arctic Burreed

Sparganium natans

Near Threatened

Arctic Butterbur

Petasites frigidus

Arctic Cottongrass

Eriophorum callitrix

Arctic daisy

Arctanthemum arcticum

Arctic Fingernailclam

Sphaerium nitidum

Arctic Forestfly

Nemoura arctica

Near Threatened

Arctic Grayling

Oeneis bore

Arctic Hiatella

Hiatella arctica

Arctic Kidney Lichen

Nephroma arcticum

Arctic Mushroom Scales Lichen

Lichenomphalia hudsoniana

Arctic poppy

Papaver nudicaule