Centaurea montana
Perennial Cornflower
Centaurea nigra
Common Knapweed
Centaurium erythraea
Common Centaury
Cerastium fontanum
Common Mouse-ear
Cerastium semidecandrum
Little Mouse-ear
Cerastium tomentosum
Snow-in-summer
Ceratocapnos claviculata
Climbing Corydalis
Ceratophyllum demersum
Rigid Hornwort
Chaenorhinum minus
Small Toadflax
Chaenorhinum origanifolium
Malling Toadflax
Chaerophyllum temulum
Rough Chervil
Chamaenerion angustifolium
Rosebay Willowherb
Chara virgata
Delicate Stonewort
Chara vulgaris
Common Stonewort
Chenopodium album
Fat-hen
Chlorociboria aeruginascens
Green Elfcup
Chrysosplenium
Chrysosplenium alternifolium
Alternate-leaved Golden-saxifrage
Chrysosplenium oppositifolium
Opposite-leaved Golden-saxifrage
Cichorium intybus
Chicory
Circaea alpina
Alpine Enchanter's-nightshade
Circaea lutetiana
Enchanter's-nightshade
Circaea x intermedia
Upland Enchanter's-nightshade
Cirsium acaule
Dwarf Thistle
Cirsium arvense
Creeping Thistle
Cirsium dissectum
Meadow Thistle
Cirsium palustre
Marsh Thistle
Cirsium vulgare
Spear Thistle
Cirsium x celakovskianum
Cladium mariscus
Great Fen-sedge
Cladonia coccifera
Cladonia crispata
Cladonia group
Cladonia macilenta
Cladonia sp.
Cladonia spp.
Cladonia squamosa
Clavulinopsis fusiformis
Golden Spindles
Claytonia perfoliata
Springbeauty
Claytonia sibirica
Pink Purslane
Clinopodium ascendens
Common Calamint
Clinopodium vulgare
Wild Basil
Clitocybe geotropa
Trooping Funnel
Cochlearia danica
Danish Scurvygrass
Cochlearia officinalis agg
Common Scurvygrass
Colchicum autumnale
Meadow Saffron
Comarum palustre
Marsh Cinquefoil
Conium maculatum
Hemlock
Conopodium majus
Pignut
Convallaria majalis
Lily-of-the-valley
Convolvulus arvensis
Field Bindweed
Coprinus comatus
Shaggy Inkcap
Cordyceps militaris
Scarlet Caterpillarclub
Cornus sanguinea
Dogwood
Corylus avellana
Hazel
Cotoneaster integrifolius
Entire-leaved Cotoneaster
Crassula helmsii
New Zealand Pigmyweed
Crataegus monogyna
Hawthorn
Crataegus rhipidophylla
Crepidotus spp.
Crepis capillaris
Smooth Hawk's-beard
Crepis vesicaria
Beaked Hawk's-beard
Crocus neapolitanus
Spring Crocus
Crocus speciosus
Bieberstein's Crocus
Cruciata laevipes
Crosswort
Cryptogramma crispa
Parsley Fern
Cymbalaria muralis
Ivy-leaved Toadflax
Cynosurus cristatus
Crested Dog's-tail
Cyrtomium fortunei
Fortune's cyrtomium
Cystolepiota hetieri