United States

Aconite

Aconitum napellus

Admiralty Island Meadow Vole (Admiraltiae)

Microtus pennsylvanicus

Agrimony

Agrimonia eupatoria

Near Threatened

Ajuga

Ajuga reptans

Endangered

Alder

Alnus glutinosa

Alder leaf beetle

Agelastica alni

Alder Spittlebug

Aphrophora alni

All Species in United States

Ruby-Crowned Kinglet

Regulus calendula

Ruby Dapperling

Leucoagaricus rubrotinctus

Ruby-throated Hummingbird

Archilochus colubris

Ruby Tiger

Phragmatobia fuliginosa

Ruddy Duck

Oxyura jamaicensis

Ruddy Highflyer

Hydriomena ruberata

Ruddy Shelduck

Tadorna ferruginea

Ruddy Turnstone

Arenaria interpres

rue-leaved saxifrage

Saxifraga tridactylites

Ruff

Calidris pugnax

Ruffed Grouse

Bonasa umbellus

Ruffled Freckle Pelt Lichen

Peltigera leucophlebia

Ruffled Jellyskin

Leptogium chloromelum

Rufous Hummingbird

Selasphorus rufus

Near Threatened

Rufous Milk-Cap

Lactarius rufus

Rugose Fork-Moss

Dicranum polysetum

Rugose Rim-Lichen

Lecanora rugosella

Runner Bean

Phaseolus coccineus

Running mountaingrass

Oplismenus compositus

Running rockcress

Arabis procurrens

Rush veneer

Nomophila noctuella

Russell'S Bolete

Aureoboletus russellii

Russell'S Fishscale Lichen

Psora russellii

Russet Brittlegill

Russula mustelina

Russet mite

Aceria anthocoptes

Russian milkvetch

Astragalus falcatus

Russian peashrub

Caragana frutex

Russian pigweed

Axyris amaranthoides

Russian-vine

Fallopia baldschuanica

Russian wheat aphid

Diuraphis noxia

Russian wildrye

Psathyrostachys juncea

Russow's peat moss

Sphagnum russowii

Russula-Like Amanita

Amanita russuloides

Rusted Stubble Lichen

Calicium salicinum

Rust fungus

Puccinia chondrillina

Rust fungus

Puccinia brachypodii

Rust fungus

Uromyces spegazzinii

Rust fungus

Puccinia cnici

Rust fungus

Puccinia hemerocallidis

Rust fungus

Puccinia peradeniyae

Rust fungus

Puccinia leveillei

Rust Fungus

Puccinia calcitrapae

Rust of bristlemallow

Puccinia modiolae

Rust of gladiolus

Uromyces transversalis

Rust of pelargonium

Puccinia pelargonii-zonalis

Rust pine borer

Arhopalus rusticus

Rusty Alpine Psora

Psora rubiformis

rusty banded aphid

Dysaphis apiifolia

Rusty Blackbird

Euphagus carolinus

Rusty Brook Lichen

Ionaspis lacustris

Extinct

Rusty Crayfish

Faxonius rusticus

Rusty Feather-Moss

Sciuro-hypnum plumosum

Rusty Firedot Lichen

Blastenia ferruginea

rusty hook moss

Scorpidium revolvens

Rusty Patched Bumble Bee

Bombus affinis

Rusty Porecrust

Fuscoporia ferruginosa

Rusty Snaketail

Ophiogomphus rupinsulensis

Rusty Swan-Neck Moss

Campylopus flexuosus

Rusty Woodwart

Hypoxylon rubiginosum

Rye brome

Bromus secalinus