United States

African-lily

Agapanthus praecox

African lovegrass

Eragrostis echinochloidea

African Marigold

Tagetes erecta

African pepperwort

Lepidium africanum

African senna

Senna didymobotrya

African signalgrass

Urochloa arrecta

African-Spinach

Amaranthus cruentus

African tuliptree

Spathodea campanulata

Agassiz's bloom moss

Schistidium agassizii

agate snail

Cecilioides acicula

Ageratum

Ageratum houstonianum

Agrimony

Agrimonia gryposepala

Agrimony Rust

Pucciniastrum agrimoniae

Agrocybe dura

Agrocybe firma

Ailanthus

Ailanthus altissima

Airplant

Tillandsia polystachia

Airplant

Tillandsia gardneri

Akulikuli-Kula

Portulaca oleracea

Alaska Bunchberry

Cornus unalaschkensis

Alaska Clubmoss

Diphasiastrum sitchense

Alaska Larch

Larix laricina

Alaska Large Awn Sedge

Carex macrochaeta

Albanian spurge

Euphorbia characias

Alberta Spruce

Picea glauca

Alder Leaf Gall Mite

Eriophyes laevis

Alder-Leaved Viburnum

Viburnum lantanoides

Alder Scalycap

Flammula alnicola

alder silk moss

Plagiothecium latebricola

Alder Tongue

Taphrina alni

Alder wooly sawfly

Eriocampa ovata

Alecost

Tanacetum balsamita

Aleppo Avens

Geum aleppicum

Aleppo Grass

Sorghum halepense

Aleutian Maidenhair

Adiantum aleuticum

Alewife Floater

Utterbackiana implicata

Alexander palm

Ptychosperma elegans

Alexandra palm

Archontophoenix alexandrae

Alexandrian laurel

Calophyllum inophyllum

Alfalfa

Medicago sativa

Alfalfa blotch leafminer

Agromyza frontella

Alfalfa Butterfly

Colias eurytheme

Alfalfa dodder

Cuscuta approximata

alfalfa leaf-cutter bee

Megachile rotundata

Algae

Cutleria cylindrica

Algal Pin Lichen

Chaenothecopsis pusiola

Alga Pondweed

Potamogeton confervoides

Alien field ant

Lasius alienus

Alisma Graminoide

Alisma gramineum

Alkali American Aster

Symphyotrichum ciliatum

Alkali-Grass

Anticlea elegans

Alkali sandspurry

Spergularia diandra

Alkali swainsonpea

Sphaerophysa salsula

Alkanet

Anchusa officinalis

Allegheny Blackberry

Rubus allegheniensis

Allegheny Monkey-Flower

Mimulus ringens

Allegheny Serviceberry

Amelanchier laevis

Allegheny Vine

Adlumia fungosa

Allheal

Valeriana officinalis

Alligatorweed

Alternanthera philoxeroides