United States

Black Morel

Morchella elata

Black Morel

Morchella angusticeps

Black Oak

Quercus velutina

Black-On-Black Crust Lichen

Orphniospora moriopsis

Black-Palped Jumping Spider

Pseudeuophrys erratica

Argentine pepperweed

Lepidium bonariense

Argentine senna

Senna corymbosa

Argent & Sable

Rheumaptera hastata

Argid Sawfly

Arge ochropus

Arkansas Grape

Vitis aestivalis

Arnold Hawthorn

Crataegus mollis

Aroma

Dichrostachys cinerea

Aromatic Knight

Tricholoma lascivum

Aromatic Sumac

Rhus aromatica

Arrhenia epichysium

Arrow Arum

Peltandra virginica

Arrow bamboo

Pseudosasa japonica

Arrow Clubtail

Stylurus spiniceps

Arrow-Grass

Triglochin maritima

Arrowhead Spiketail

Cordulegaster obliqua

Arrowleaf butterfly pea

Centrosema sagittatum

Arrowleaf clover

Trifolium vesiculosum

Arrowleaf elephant's ear

Xanthosoma sagittifolium

Arrow-Wood

Viburnum dentatum

Arsenic bush

Senna septemtrionalis

Athel tamarisk

Tamarix aphylla

athenarian burrowing anemone

Nematostella vectensis

Atlantic Bay Scallop

Argopecten irradians

Atlantic Cordgrass

Sporobolus alterniflorus

Atlantic Giant Pumpkin

Cucurbita maxima

Atlantic Ninebark

Physocarpus opulifolius

Atlantic Sedge

Carex atlantica

Atractosporocybe inornata

Aubretia

Aubrieta deltoidea

Audubon's Warbler

Setophaga auduboni

Auger beetle

Sinoxylon ceratoniae

August Flower

Scorzoneroides autumnalis

August-Lily

Hosta plantaginea

Ocean Sunfish

Mola mola

auricled twayblade

Neottia auriculata

aurochs

Bos taurus

Austin's peat moss

Sphagnum austinii

Arthonia punctiformis

Arum-Leaf Arrowhead

Sagittaria cuneata

Asa Gray'S Sedge

Carex grayi

Ascending Grapefern

Botrychium ascendens

Ascocoryne cylichnium

Ashen Coral

Tremellodendropsis tuberosa

Ashen hoarypea

Tephrosia cinerea

Ash Rust

Puccinia sparganioidis

Ash Tree Bolete

Boletinellus merulioides

Ash whitefly

Siphoninus phillyreae

Ash whitefly parasitoid

Encarsia inaron

Ashy Cinquefoil

Potentilla inclinata

Ashy Clubtail

Phanogomphus lividus

Ashy pipewort

Eriocaulon cinereum

Ashy Willow

Salix cinerea

Asian Ambrosia Beetle

Xyleborinus attenuatus

Asian Bittersweet

Celastrus orbiculatus

Asian hard clam

Meretrix lusoria