United States

Aconite

Aconitum napellus

Critically Endangered

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

clear glass snail

Aegopinella pura

Clear-Spored Rash Lichen

Lithothelium hyalosporum

Clearweed

Pilea fontana

Clermont'S Spleenwort

Asplenium clermontiae

Extinct

Cliff-Brake

Cryptogramma stelleri

Cliff Scalewort

Porella cordaeana

Climbing Bindweed

Fallopia scandens

Climbing cactus

Epiphyllum hookeri

Climbing Euonymus

Euonymus fortunei

Climbing False Buckwheat

Fallopia dumetorum

Climbingfig

Ficus pumila

Climbing ilang-ilang

Artabotrys hexapetalus

Climbing Prairie Rose

Rosa setigera

Clint Crisp-Moss

Tortella densa

Clinton'S Wood Fern

Dryopteris clintoniana

Closed Gentian

Gentiana rubricaulis

Closed-Leaved Pondweed

Potamogeton foliosus

Cloth of gold

Crocus angustifolius

Clouded Agaric

Clitocybe nebularis

Cloudless Sulphur

Phoebis sennae

Cloud Sedge

Carex haydenii

Clovenlip toadflax

Linaria bipartita

Clove Pink

Dianthus plumarius

clover aphid

Nearctaphis bakeri

Clover Cutworm

Anarta trifolii

Clover Dodder

Cuscuta epithymum

Endangered

Clover Hayworm Moth

Hypsopygia costalis

Clover Leaf Weevil

Brachypera zoilus

Clover mite

Bryobia praetiosa

Clover Root Borer

Hylastinus obscurus

Near Threatened

Clover Seed Weevil

Tychius picirostris

Clover weevil

Sitona hispidulus

Clown beetle

Atholus bimaculatus

Clown beetle

Acritus komai

Clown beetle

Carcinops pumilio

Clubbed begonia

Begonia cucullata

Club Foot

Ampulloclitocybe clavipes

Club Grain-Spored Lichen

Sarcogyne clavus

Data Deficient

clubmoss leafy moss

Mnium lycopodioides

club pincushion moss

Ulota coarctata

Club-Spur Orchid

Platanthera clavellata

Cluster Bat

Myotis sodalis

Near Threatened

Cluster Cap

Connopus acervatus

Clustered Bonnet

Mycena inclinata

Clustered Bracket

Inonotus cuticularis

Clustered Brown Bolete

Aureoboletus innixus

Clustered clover

Trifolium glomeratum

Clustered Dock

Rumex conglomeratus

Clustered Domecap

Lyophyllum decastes

clustered earth moss

Ephemerum cohaerens

Clustered-Leaved Tick-Trefoil

Hylodesmum glutinosum

Clustered yellowtops

Flaveria trinervia

Cluster Fescue

Festuca paradoxa

Extinct

Cluster Sanicle

Sanicula odorata

Coalman

Tricholoma portentosum

Data Deficient

Coastal Arrowhead

Sagittaria graminea

Coastal Dung Beetle

Onthophagus nigriventris

Coastal False Asphodel

Triantha racemosa

Extinct

Coastal plain creepingoxeye

Wedelia fruticosa

Coastal Red Elderberry

Sambucus racemosa