Australia

Acrid lettuce

Lactuca virosa

Adam's Leedle

Yucca gloriosa

Adam'S Needle

Yucca filamentosa

Adder's-tongue Spearwort

Ranunculus ophioglossifolius

Adriatic soapwort

Saponaria calabrica

Aegean wallflower

Erysimum cheiri

African amaranth

Amaranthus muricatus

African asparagus fern

Asparagus asparagoides

African Bermuda-grass

Cynodon incompletus

African boxthorn

Lycium ferocissimum

African bristlegrass

Setaria sphacelata

African cornflag

Chasmanthe floribunda

African daisy

Arctotis stoechadifolia

African-lily

Agapanthus praecox

African locust-bean

Parkia biglobosa

African Marigold

Tagetes erecta

African pepperwort

Lepidium africanum

African scurfpea

Psoralea pinnata

African senna

Senna didymobotrya

African-Spinach

Amaranthus cruentus

African tuliptree

Spathodea campanulata

Ageratum

Ageratum houstonianum

Ailanthus

Ailanthus altissima

akee

Blighia sapida

Aleppo Grass

Sorghum halepense

Alexandrium tamarense

Alfalfa

Medicago sativa

Alfalfa dodder

Cuscuta approximata

Algerian Iris

Iris unguicularis

Algerian Oak

Quercus canariensis

Alkali sandspurry

Spergularia diandra

Alkanet

Anchusa officinalis

Alligatorweed

Alternanthera philoxeroides

Aloe Yucca

Yucca aloifolia

Alpine Knapweed

Centaurea nigrescens

Alsike Clover

Trifolium hybridum

Amboyna Wood

Pterocarpus indicus

American Barnyard Grass

Echinochloa muricata

American Bellbine

Calystegia silvatica

American carpet grass

Axonopus compressus

American Cress

Barbarea verna

American evergreen

Syngonium podophyllum

American Hackberry

Celtis occidentalis

American Ivy

Parthenocissus quinquefolia

American Pumpkin

Cucurbita pepo

American Pussy Willow

Salix discolor

American Red Raspberry

Rubus idaeus

American Sea Rocket

Cakile edentula

American Water-Lily

Nymphaea odorata

American Willowherb

Epilobium ciliatum

Angel's-trumpet

Brugmansia candida

Angel's-wings

Opuntia microdasys

angled iceplant

Mesembryanthemum aitonis

Angled pea

Lathyrus angulatus

Anil de pasto

Indigofera suffruticosa

Animated oat

Avena sterilis

Aniseed-Weed

Foeniculum vulgare

Annual bastardcabbage

Rapistrum rugosum

Annual blue-eyed grass

Sisyrinchium rosulatum

Annual Bluegrass

Poa annua