United Kingdom

Blessed milkthistle

Silybum marianum

Blindeyes

Papaver dubium

Blood Ragweed

Ambrosia trifida

Bloody-Butcher

Pulmonaria officinalis

Bloody geranium

Geranium sanguineum

bloody-red shrimp

Hemimysis anomala

black-tailed jackrabbit

Lepus californicus

black-tailed prairie dog

Cynomys ludovicianus

Black Vine Weevil

Otiorhynchus sulcatus

Black wattle

Acacia mearnsii

Blackwell Switch Grass

Panicum virgatum

Black-Widow

Geranium phaeum

Blackwood

Acacia melanoxylon

Blotched Spurge

Euphorbia maculata

Blue Cardinal Flower

Lobelia siphilitica

Blue Comfrey

Symphytum uplandicum

Blue Corn-lily

Aristea ecklonii

Bluecrown passionflower

Passiflora caerulea

Blue Crystalwort

Riccia crystallina

Blue Eryngo

Eryngium planum

Boar Thistle

Cirsium arvense

Boccone's sandspurry

Spergularia bocconei

bogan-flea

Calotis hispidula

Bog Arum

Calla palustris

Bog Loosestrife

Lysimachia terrestris

Bohena Beauty

Cenchrus longispinus

boisduval scale

Diaspis boisduvalii

Bokhara Clover

Melilotus albus

Blue-Eyed Grass

Sisyrinchium angustifolium

blue fescue

Festuca glauca

Blue Flag

Iris versicolor

blue horntail

Sirex juvencus

Blue Horntail

Sirex cyaneus

Blue Iris

Iris spuria

Blue Jacob'S Ladder

Polemonium caeruleum

Blue leadwood

Ceratostigma plumbaginoides

Blue Riverdamsel

Pseudagrion microcephalum

blue-stem willow

Salix irrorata

Blue woodruff

Asperula arvensis

Blumeriella jaapii

Bolbitius coprophilus

Book louse

Liposcelis pearmani

Book louse

Liposcelis corrodens

Book louse

Liposcelis entomophila

Bostrichid beetle

Heterobostrychus hamatipennis

Botryotinia squamosa

Bottlebrush

Sanguisorba canadensis

Bouncing Bet

Saponaria officinalis

Box-elder, Ash-leaved maple

Acer negundo

Brazilian joyweed

Alternanthera brasiliana

Breckland Mugwort

Artemisia campestris

breckland speedwell

Veronica praecox

Brentid Beetle

Rhopalapion longirostre

Bridal-Wreath

Spiraea prunifolia

Box tree moth

Cydalima perspectalis

Boxwood leafminer

Monarthropalpus flavus

bramble leafhopper

Ribautiana tenerrima

Branched Horsetail

Equisetum ramosissimum

Branched Plantain

Plantago arenaria

Branching Campion

Silene dichotoma