United Kingdom

Black Nightshade

Solanum nigrum

black pea

Lathyrus niger

Argentine Cocklebur

Xanthium ambrosioides

Argentine needlegrass

Nassella tenuissima

Argentine pepperweed

Lepidium bonariense

Arizona beggar-ticks

Bidens aurea

arizona-cypress

Cupressus arizonica

Armenian crane's-bill

Geranium psilostemon

Arrocillo

Paspalum paniculatum

Arrow bamboo

Pseudosasa japonica

arrow-head scale

Unaspis yanonensis

Arrowleaf clover

Trifolium vesiculosum

Arrowleaf sida

Sida rhombifolia

Arsenic bush

Senna septemtrionalis

Artemisia

Artemisia vulgaris

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

Asian Longhorned Beetle

Anoplophora glabripennis

Asian Skunk-cabbage

Lysichiton camtschatcensis

Asiatic Dayflower

Commelina communis

Asiatic red scale

Aonidiella taxus

Asparagus fern

Asparagus densiflorus

Astrantia

Astrantia major

Asian brush crab

Hemigrapsus takanoi

Asian Bush Mosquito

Aedes japonicus

Asian chestnut gall wasp

Dryocosmus kuriphilus

Asian Clam

Corbicula fluminalis

Asian date mussel

Arcuatula senhousia

Asian drill snail

Ocinebrellus inornatus

Asian kelp

Undaria pinnatifida

Asian Lady Beetle

Harmonia axyridis

Asian netvein hollyfern

Cyrtomium fortunei

Asian pigeonwings

Clitoria ternatea

Asian Pony'S-Foot

Dichondra micrantha

Asian Shore Crab

Hemigrapsus sanguineus

Asian Tiger Mosquito

Aedes albopictus

Asparagus

Asparagus officinalis

Asparagus Beetle

Crioceris asparagi

aspen daisy

Erigeron speciosus

Aster-Like Boltonia

Boltonia asteroides

Bell-Bean

Vicia faba

Belvedere

Bassia scoparia

Bengal Gram

Cicer arietinum

Bermuda buttercup

Oxalis pes-caprae

Bermudagrass

Cynodon dactylon

Bermuda Thistle

Argemone mexicana

Bethlehem Lungwort

Pulmonaria saccharata