United Kingdom

African-lily

Agapanthus praecox

African Marigold

Tagetes erecta

African pepperwort

Lepidium africanum

African-Spinach

Amaranthus cruentus

agate snail

Cecilioides acicula

Ageratum

Ageratum houstonianum

Ailanthus

Ailanthus altissima

Akiraho

Olearia paniculata

Akulikuli-Kula

Portulaca oleracea

Alaska Cedar

Xanthocyparis nootkatensis

Albanian spurge

Euphorbia characias

Alberta Spruce

Picea glauca

Alecost

Tanacetum balsamita

Aleppo Grass

Sorghum halepense

alexanders

Smyrnium olusatrum

Alexanders Rust

Puccinia smyrnii

Alexandra's Parrot / Princess Parrot

Polytelis alexandrae

Alexandrium leei

Alexandrium tamarense

Algerian Iris

Iris unguicularis

Algerian Ivy

Hedera algeriensis

Algerian Oak

Quercus canariensis

Alkanet

Anchusa officinalis

Allegheny Blackberry

Rubus allegheniensis

Alligatorweed

Alternanthera philoxeroides

Allium leafminer

Phytomyza gymnostoma

Aloe Yucca

Yucca aloifolia

Alpine Blue-sow-thistle

Cicerbita alpina

Alpine currant

Ribes alpinum

Alpine Dock

Rumex alpinus

Alpine Fur

Abies lasiocarpa

Alpine Knapweed

Centaurea nigrescens

alpine meadow grass

Poa alpina

alpine-scabious

Cephalaria alpina

Alpine Squill

Scilla bifolia

Alsike Clover

Trifolium hybridum

Alternaria saponariae

Alternate-leaved Butterfly-bush

Buddleja alternifolia

Amarelle Cherry

Prunus cerasus

Ambrosi's Cave Salamander

Speleomantes ambrosii

American Barnyard Grass

Echinochloa muricata

American Bellbine

Calystegia silvatica

American Black Elderberry

Sambucus canadensis

American Black Nightshade

Solanum americanum

American Blueberry

Vaccinium corymbosum

American Blue-Eyed-Grass

Sisyrinchium montanum

American Blue Vervain

Verbena hastata

American brackish water medusa

Nemopsis bachei

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