Calamagrostis arundinacea

Calamagrostis canescens

Calamagrostis epigejos

Calamagrostis pseudophragmites

Calamintha menthifolia

Calamintha nepeta agg.

Calendula arvensis

Calendula officinalis

Calepina irregularis

Calla palustris

Callistephus chinensis

Callitriche hamulata

Callitriche obtusangula

Callitriche palustris agg.

Calluna vulgaris

Caltha palustris

Calystegia sepium

Camelina sativa

Camelina sativa agg.

Camelina sativa var. sativa

Campanula alliariifolia

Campanula baumgartenii

Campanula carpatica

Campanula cochleariifolia

Campanula glomerata

Campanula medium

Campanula patula

Campanula persicifolia

Campanula rapunculoides

Campanula rapunculus

Campanula rotundifolia

Campanula trachelium

Cannabis sativa

Capsella bursa-pastoris

Capsella rubella

Capsicum annuum

Caragana arborescens

Cardamine amara

Cardamine bulbifera

Cardamine flexuosa

Cardamine hirsuta

Cardamine impatiens

Cardamine pratensis

Cardaminopsis arenosa ssp. arenosa

Cardaminopsis arenosa ssp. borbasii

Cardaria draba

Carduus acanthoides

Carduus crispus

Carduus nutans

Carduus x orthocephalus = C. acanthoides x nutans

Carduus x polyacanthus = C. crispus x nutans ssp. nutans

Carex acuta

Carex acutiformis

Carex alba

Carex appropinquata

Carex brizoides

Carex canescens

Carex caryophyllea

Carex davalliana

Carex demissa

Carex digitata

Carex distans

Carex disticha

Carex divulsa

Carex echinata

Carex elata

Carex elongata

Carex flacca

Carex flava

Carex flava agg.

Carex grayi

Carex guestphalica

Carex hartmanii

Carex hartmaniorum

Carex hirta

Carex lasiocarpa

Carex lepidocarpa

Carex montana

Carex muricata agg.

Carex nigra

Carex ornithopoda

Carex otrubae

Carex ovalis

Carex pairae

Carex pallescens

Carex panicea

Carex paniculata

Carex pendula

Carex pilosa

Carex pilulifera

Carex praecox

Carex pseudocyperus

Carex remota

Carex riparia

Carex rostrata

Carex spicata

Carex strigosa

Carex sylvatica

Carex tomentosa

Carex umbrosa

Carex vesicaria

Carex viridula

Carex vulpina

Carex vulpina agg.

Carex x boenninghauseniana = C. paniculata x remota

Carlina acaulis

Carlina vulgaris

Carpinus betulus

Carthamus tinctorius

Carum carvi

Castanea sativa

Catalpa bignonioides

Catananche caerulea

Catapodium rigidum ssp. rigidum

Cedrus atlantica

Celtis occidentalis

Centaurea calcitrapa

Centaurea cyanus

Centaurea diffusa

Centaurea jacea

Centaurea jacea ssp. angustifolia

Centaurea jacea ssp. jacea

Centaurea montana

Centaurea nigra ssp. nemoralis

Centaurea nigrescens ssp. nigrescens

Centaurea pseudophrygia

Centaurea scabiosa

Centaurea solstitialis

Centaurea stoebe

Centaurea x "subjacea" = C. jacea s. l. x nigra s. l.

Centaurea x juvenalis = C. diffusa x C. jacea

Centaurea x ligerina = C. jacea x stoebe

Centaurea x psammogena = C. diffusa x stoebe

Centaurium erythraea

Centaurium pulchellum

Centranthus ruber

Cephalanthera damasonium

Cephalanthera longifolia

Cephalanthera rubra

Cerastium arvense

Cerastium brachypetalum

Cerastium glomeratum

Cerastium glutinosum

Cerastium holosteoides

Cerastium pumilum

Cerastium semidecandrum

Cerastium tomentosum

Ceratocapnos claviculata

Ceratophyllum demersum

Ceratophyllum submersum

Cercis siliquastrum

Chaenomeles speciosa

Chaenorhinum minus

Chaerophyllum aromaticum

Chaerophyllum aureum

Chaerophyllum bulbosum

Chaerophyllum temulum

Chamaecyparis lawsoniana

Chamaespartium sagittale

Chamaesyce humifusa

Chamaesyce maculata

Chamaesyce prostrata

Chamaesyce serpens

Chelidonium majus

Chenopodium album

Chenopodium ambrosioides

Chenopodium bonus-henricus

Chenopodium botrys

Chenopodium ficifolium

Chenopodium foliosum

Chenopodium glaucum

Chenopodium hybridum

Chenopodium murale

Chenopodium opulifolium

Chenopodium polyspermum

Chenopodium pumilio

Chenopodium rubrum

Chenopodium schraderianum

Chenopodium strictum ssp. striatiforme

Chenopodium strictum ssp. strictum

Chenopodium urbicum

Chenopodium vulvaria

Chionodoxa forbesii

Chionodoxa luciliae

Chionodoxa sardensis

Chondrilla juncea

Chrysanthemum coronarium

Chrysanthemum segetum

Chrysosplenium alternifolium

Chrysosplenium oppositifolium

Cichorium calvum

Cichorium endivia

Cichorium intybus

Cicuta virosa

Circaea alpina

Circaea lutetiana

Circaea x intermedia = C. alpina x lutetiana

Cirsium acaule

Cirsium arvense

Cirsium eriophorum ssp. eriophorum

Cirsium oleraceum

Cirsium palustre

Cirsium tuberosum

Cirsium vulgare

Cirsium x braunii = C. oleraceum x tuberosum

Cirsium x hybridum = C. oleraceum x palustre

Cirsium x medium = C. acaule x tuberosum

Citrullus lanatus

Cladium mariscus

Claytonia perfoliata

Clematis vitalba

Cleome graveolens

Clinopodium vulgare

Cnicus benedictus

Cnidium dubium

Cochlearia danica

Coeloglossum viride

Coincya monensis

Colchicum autumnale

Colutea arborescens

Comarum palustre

Commelina communis

Conium maculatum

Consolida ajacis

Consolida regalis

Convallaria majalis

Convolvulus arvensis

Conyza albida

Conyza bonariensis

Conyza canadensis

Coreopsis grandiflora

Coreopsis tinctoria

Coreopsis verticillata

Coriandrum sativum

Corispermum leptopterum

Cornus alba agg.

Cornus mas

Cornus sanguinea ssp. australis

Cornus sanguinea ssp. hungarica

Cornus sanguinea ssp. sanguinea

Coronopus didymus

Coronopus squamatus

Corydalis cava

Corydalis solida

Corylus avellana

Corylus colurna

Corynephorus canescens

Cosmos bipinnatus

Cotinus coggygria

Cotoneaster bullatus

Cotoneaster dammeri

Cotoneaster dielsianus

Cotoneaster divaricatus

Cotoneaster horizontalis

Cotoneaster monopyrenus

Cotoneaster salicifolius

Crassula helmsii

Crataegus crus-galli

Crataegus laevigata

Crataegus monogyna

Crataegus x macrocarpa = C. laevigata x rhipidophylla

Crataegus x media = C. laevigata x monogyna

Crataegus x subsphaericea = C. monogyna x rhipidophylla

Crepis biennis

Crepis capillaris

Crepis foetida

Crepis paludosa

Crepis praemorsa

Crepis pulchra

Crepis setosa

Crepis tectorum

Crepis vesicaria ssp. taraxacifolia

Crocus spec.

Crocus tommasinianus

Cruciata laevipes

Cucubalus baccifer

Cucumis melo

Cucumis sativus

Cucurbita maxima

Cucurbita pepo

Cuscuta campestris

Cuscuta epithymum

Cuscuta europaea

Cuscuta lupuliformis

Cyclamen hederifolium

Cyclamen purpurascens

Cydonia oblonga

Cymbalaria muralis

Cynodon dactylon

Cynoglossum officinale

Cynosurus cristatus

Cyperus eragrostis

Cyperus esculentus

Cyperus fuscus

Cyperus longus ssp. longus

Cystopteris fragilis

Cytisus scoparius

Cytisus striatus