United Kingdom

American Buffalo Treehopper

Stictocephala bisonia

American Comb Jelly

Mnemiopsis leidyi

American Cranberry

Vaccinium macrocarpon

American Cress

Barbarea verna

American Cupped Oyster

Crassostrea virginica

American Dragon-Head

Dracocephalum parviflorum

American Figwort

Scrophularia lanceolata

American Fox Sedge

Carex vulpinoidea

American Gooseberry Mildew

Podosphaera mors-uvae

American Hackberry

Celtis occidentalis

American Hedge-Hyssop

Gratiola neglecta

American Horseshoe Crab

Limulus polyphemus

American Ivy

Parthenocissus quinquefolia

American Oyster Drill

Urosalpinx cinerea

American Piddock

Petricolaria pholadiformis

American Plane

Platanus occidentalis

American Pumpkin

Cucurbita pepo

American Rhododendron

Rhododendron maximum

American skunk cabbage

Lysichiton americanus

American Slipper Limpet

Crepidula fornicata

American Spikenard

Aralia racemosa

American Storax

Liquidambar styraciflua

American Tearthumb

Persicaria sagittata

American Tickseed

Coreopsis grandiflora

American Twinflower

Linnaea borealis

American Wainscot

Mythimna unipuncta

American Walnut

Juglans nigra

American White Moth

Hyphantria cunea

American Willowherb

Epilobium ciliatum

Anchor worm

Lernaea cyprinacea

Andean Water Milfoil

Myriophyllum quitense

Andromeda Lacebug

Stephanitis takeyai

An Eyebright

Euphrasia stricta

Angel's-tears

Narcissus triandrus

Angel'S Trumpet

Datura innoxia

Angel's-trumpets

Datura ferox

Angel's-wings

Opuntia microdasys

Angled Burr Cucumber

Sicyos angulatus

Angled Hydromedusa

Gonionemus vertens

Angled pea

Lathyrus angulatus

Angoumois grain moth

Sitotroga cerealella

Animated oat

Avena sterilis

Anise

Myrrhis odorata

Aniseed-Weed

Foeniculum vulgare

Ankara Crocus

Crocus ancyrensis

Atlantic Giant Pumpkin

Cucurbita maxima

Atlantic Ninebark

Physocarpus opulifolius

Atlantic rangia

Rangia cuneata

Atlantic Stream Crayfish

Austropotamobius pallipes

Atlantic Surf Clam

Spisula solidissima

Atlas Cedar

Cedrus atlantica

Atlas Poppy

Papaver atlanticum

Aubretia

Aubrieta deltoidea

Auricula

Primula auricula

Ascochyta syringae

Ashy Cinquefoil

Potentilla inclinata

Asian Ambrosia Beetle

Xyleborinus attenuatus

Asian Bittersweet

Celastrus orbiculatus

Asian China-mark

Elophila difflualis

Asian Hornet

Vespa velutina