-
Callitriche platycarpa – Various-leaved Water-starwort
Species, Flowering plant, Freshwater
Brigwlydd y Gwanwyn, Brigwlydd Gwanwynol
-
Callitriche stagnalis – Common Water-starwort
Species, Flowering plant, Freshwater
Brigwlydd Cyffredin, Brigwlydd y Llynau, Llinhesg Llaca, Llinhesg y Dŵr, Brigwlydd y Dŵr
-
Callitriche truncata – Short-leaved Water-starwort
Species, Flowering plant, Freshwater
Brigwlydd Brigddail, Brigwlydd Byrddail
-
Calluna vulgaris – Heather
Species, Flowering plant, Freshwater
Common Heather, Ling, fraoch, fraoich, Amriwraeth Blewog, Grug, Eiddiar, Grug Cyffredin, Grug Ysgub, Grug y Mêl, Grug y Mynydd, Myncog
-
Caltha palustris – Marsh-marigold
Species, Flowering plant, Freshwater
Marsh Marigold, Giant Kingcup, lus buidhe Bealltainn, lusan buidhe Bealltainn, Cwpanau'r Brenin, Rhuddlas y Gors, Gold y Gors, Gold Mair, Melyn y Gors, Aur y Gors, Troed yr Ebol, Troed yr Ebol y Gors, Rhuddos Mai, Sawdl y Fuwch, Llysiau Mair, Rhuddos y Gors, Rhuddos y Morfa
-
Calystegia sepium – Hedge Bindweed
Species, Flowering plant, Freshwater
Great Bindweed agg., Clych y Perthi, Cloffrwym y Cythraul, Boled Olwen, Cap Nos Nain, Taglys Mawr, Taglys y Perthi, Cwlwm y Coed, Ladi Wen, Cloffrwym y Mwci, Tagwydd
-
Cardamine amara – Large Bitter-cress
Species, Flowering plant, Freshwater
Berwr Chwerw Mawr, Berw Chwerw Mwyaf, Berwt Chwerw, Chwerw Mawr, Hydyf Mawr
-
Cardamine flexuosa – Wavy Bitter-cress
Species, Flowering plant, Freshwater
Berwr Chwerw Hyblyg, Berwr Plygog, Berwr Cam, Berwr y Nant Mwyaf, Chwerw'r Coed, Hydyf Chwerw
-
Cardamine hirsuta – Hairy Bitter-cress
Species, Flowering plant, Freshwater
Hydyf Blewog yr Ardd, Berwr Chwerw Blewog, Berwr y Gerddi, Berwr Blewog, Berwr y Meysydd, Chwerw Blewog, Hydyf Blewog y Maes, Hydyf Blewog
-
Cardamine impatiens – Narrow-leaved Bitter-cress
Species, Flowering plant, Freshwater
Berwr Chwerw Culddail, Berw Chwerw â Deilen Gul, Chwerw Culddail
-
Cardamine pratensis – Cuckooflower
Species, Flowering plant, Freshwater
Milk-Maids, Lady's Smock, Cuckoo Flower, Blodyn Llefrith, Blodau'r Cegid Bychain, Blodyn y Gog, Blodau'r Llefrith, Blodau'r Gethlydd, Blodau'r Gog, Blodyn Llo Bach, Hydwf y Waun, Hydyf, Blodyn Llaeth, Blodau'r Gwcw, Hosanau'r Gog, Blodeuyn y Gog, Ffedog y Forwyn, Esgidiau a Hosanau'r Gog, Hydyf y Waun, Llaethferch
-
Carduus nutans – Musk Thistle
Species, Flowering plant, Freshwater
Ysgall Pengrwn, Ysgallen Bendrom, Ysgallen Ogwydd, Ysgallen Pendrymus, Ysgall Pendrwm
-
Carex acuta – Slender Tufted-sedge
Species, Flowering plant, Freshwater
Acute Sedge, Hesgen Tywysennau Main, Hesgen Eiddil Dywysennog, Hesg Tywysennau Main
-
Carex acutiformis – Lesser Pond-sedge
Species, Flowering plant, Freshwater
Hesgen-y-Dŵr Fach, Hesgen Ganolig-Dywysennog
-
Carex appropinquata – Fibrous Tussock-sedge
Species, Flowering plant, Freshwater
Hesgen Ffibrog, Hesg Ffibrog, Hesgen Fanedafedd
-
Carex aquatilis – Water Sedge
Species, Flowering plant, Freshwater
Hesgen Dailsyth, Hesgen y Dŵr, Hesg y Dŵr
-
Carex canescens – White Sedge
Species, Flowering plant, Freshwater
Hesgen Benwen, Hesg Penwyn
-
Carex diandra – Lesser Tussock-sedge
Species, Flowering plant, Freshwater
Hesgen Dwybrigerog, Hesgen Rafunog Fach, Hesgen Rafunog Leiaf
-
Carex dioica – Dioecious Sedge
Species, Flowering plant, Freshwater
Separate-Headed Sedge, Hesgen Dwyaneddol, Hesgen Ysgar, Hesg Ysgar
-
Carex disticha – Brown Sedge
Species, Flowering plant, Freshwater
Hesgen Lygliw, Hesg Llygliw, Hesgen Lygliw Benblydd