Not Established

	Common name (English)
Cycloscala hyalina
Cyclospermum leptophyllum	marsh parsley; slender celery; fir-leaved celery
Cydonia oblonga	Quince
Cygnus olor	Mute swan
Cymbalaria muralis	Kenilworth Creeper
Cynara cardunculus var. hortensis	Globe Artichoke
Cyperus esculentus	Yellow nutsedge, Earth Almond
Cytisus scoparius	Broom
Dahlia coccinea	Red dahlia
Dahlia ×pinnata	Dahlia, Garden Dahlia
Dalbergia sissoo	Indian Rosewood
Danaus plexippus	Monarch butterfly
Dasylirion acrotrichum	Great Desert Spoon
Datura metel	Fireweed
Delonix regia	Flame of the forest; Royal poinciana; Flamboyan
Delphinium ajacis	Larkspur
Dendrocalamus strictus	Calcutta bamboo
Descurainia sophia	Flixweed
Deutzia crenata	Crenate pride-of-Rochester
Dichondra micrantha	Kidneyweed