United States

Agrimony

Agrimonia eupatoria

Ajuga

Ajuga reptans

Alder

Alnus glutinosa

Alder leaf beetle

Agelastica alni

Alder Spittlebug

Aphrophora alni

All Species in United States

Rattlebox

Sesbania punicea

Rattlesnake brome

Bromus briziformis

Rattlesnake plant

Calathea crotalifera

Rattleweed

Crotalaria retusa

Ravenel'S Stinkhorn

Phallus ravenelii

Rayed Glass Snail

Perpolita hammonis

Ray Spider

Theridiosoma gemmosum

Razorbill

Alca torda

read-headed ash borer

Neoclytus acuminatus

Recurved Peatmoss

Sphagnum recurvum

Red Admiral

Vanessa atalanta

Red algae

Ceramium sinicola

Red algae

Acanthophora spicifera

Red algae

Kappaphycus alvarezii

Red algae

Caulacanthus ustulatus

Red algae

Lomentaria hakodatensis

Red Algae

Spyridia filamentosa

Red and black flat mite

Brevipalpus phoenicis

Red ash

Alphitonia excelsa

Red Avadavat

Amandava amandava

Red-Backed Cutworm Moth

Euxoa ochrogaster

Red-Banded Polypore

Fomitopsis pinicola

Redbanded thrip

Selenothrips rubrocinctus

Red Banded Webcap

Cortinarius armillatus

red-barred tortrix

Ditula angustiorana

Red bartsia

Odontites vernus

Critically Endangered

Red beadtree

Adenanthera pavonina

Red Beard Lichen

Usnea rubicunda

red beard moss

Bryoerythrophyllum recurvirostrum

Red-bellied Squirrel

Sciurus aureogaster

Red-Bellied Woodpecker

Melanerpes carolinus

Red-belted bumble bee

Bombus rufocinctus

Red-billed Leiothrix

Leiothrix lutea

Red bloodwood

Corymbia gummifera

Redbox

Eucalyptus polyanthemos

Red-breasted Merganser

Mergus serrator

Red-Breasted Nuthatch

Sitta canadensis

Red brome

Bromus rubens

Red-brown click beetle

Athous haemorrhoidalis

Red Buckeye

Aesculus pavia

Red Buffalo-bur

Solanum sisymbriifolium

Red Campion

Silene dioica

Red Chokeberry

Aronia arbutifolia

Redclaw

Cherax quadricarinatus

Red Clover Seed Weevil

Tychius stephensi

Vulnerable

Red Corn-lily

Ixia campanulata

Red-Cracking Bolete

Xerocomellus chrysenteron

Red-crested Cardinal

Paroaria coronata

Red-crowned Parrot / Red-crowned Amazon

Amazona viridigenalis

red crust

Cryptosula pallasiana

Reddening Lepiota

Leucoagaricus americanus

Reddish Brown Bitter Bolete

Tylopilus rubrobrunneus

Red dock

Rumex bucephalophorus

Red Dock Spot

Ramularia rubella

Red Edge Brittlestem

Psathyrella corrugis

Red-Eyed Vireo

Vireo olivaceus

Red floripontio

Brugmansia sanguinea

Extinct in the Wild

Red flour beetle

Tribolium castaneum

Redflower gum

Corymbia ficifolia

Redflower ragleaf

Crassocephalum crepidioides