United States

Aconite

Aconitum napellus

Critically Endangered

Admiralty Island Meadow Vole (Admiraltiae)

Microtus pennsylvanicus

Agrimony

Agrimonia eupatoria

Ajuga

Ajuga reptans

Endangered

Alder

Alnus glutinosa

Alder leaf beetle

Agelastica alni

Alder Spittlebug

Aphrophora alni

All Species in United States

Bland Sweet Cicely

Osmorhiza claytonii

Blanket flower

Gaillardia grandiflora

Blasdell'S Laurentian Bladder Fern

Cystopteris laurentiana

Blazing Star

Liatris spicata

Bleeding Bonnet

Mycena sanguinolenta

Bleeding Conifer Crust

Stereum sanguinolentum

Bleeding Fairy Helmet

Mycena haematopus

Bleeding-Heart

Dicentra formosa

Bleeding Oak Crust

Stereum gausapatum

Blessed milkthistle

Silybum marianum

Blessed thistle

Centaurea benedicta

Blewit

Lepista nuda

Blindeyes

Papaver dubium

Blind's bryum

Bryum blindii

Blister Buttercup

Ranunculus sceleratus

Blistered Cup

Peziza vesiculosa

Blistered Jelly Lichen

Collema nigrescens

Blistered Jellyskin Lichen

Leptogium corticola

Blistered Rock Tripe

Umbilicaria hyperborea

Extinct

Blistered Toadskin Lichen

Lasallia pustulata

Blistered Woodwax

Hygrophorus pustulatus

Blister Flower

Ranunculus bulbosus

Blisterwort

Ranunculus recurvatus

Data Deficient

Blond Field Ant

Lasius flavus

Blondin De Cuvier

Perimyotis subflavus

Bloodflower

Asclepias curassavica

Blood Iris

Iris sanguinea

Blood Milkwort

Polygala sanguinea

Blood Ragweed

Ambrosia trifida

Blood red tassel flower

Calliandra haematocephala

Bloodred Webcap

Cortinarius sanguineus

Blood root

Justicia secunda

Bloodroot

Sanguinaria canadensis

Blood sage

Salvia coccinea

Bloodtwig dogwood

Cornus sanguinea

blood worm

Lumbricus rubellus

Bloodwort

Achillea millefolium

Bloody Beard

Usnea mutabilis

Bloody Brittlegill

Russula sanguinea

Bloody-Butcher

Pulmonaria officinalis

Bloody geranium

Geranium sanguineum

Bloody-Heart Lichen

Mycoblastus sanguinarius

Critically Endangered

bloody-red shrimp

Hemimysis anomala

Bloody small dung beetle

Otophorus haemorrhoidalis

Blotched Spurge

Euphorbia maculata

Blowball

Taraxacum officinale

Blow fly

Lucilia caesar

Blow Fly

Lucilia sericata

Blue-and-yellow Macaw

Ara ararauna

Blue Band Brittlegill

Russula chloroides

Blue Bead-Lily

Clintonia borealis

Blue-Bean

Lupinus perennis

Bluebell

Campanula rotundifolia

Bluebell creeper

Billardiera heterophylla

Bluebells

Mertensia virginica

Blueberry

Vaccinium angustifolium

Blueberry leafroller

Dasystoma salicella

Blue Bottle Fly

Calliphora vomitoria

Blue Bugle

Ajuga genevensis

Critically Endangered

Blue Buttons

Knautia arvensis