1. Not yet discovered
   - undiscovered

See also: unknown

• arrow arum
• arrow grass
• Cheever
• cheewink
• chef
• chef's salad
• chef-d'oeuvre
• Cheilanthes
• Cheilanthes alabamensis
• Cheilanthes eatonii
• Cheilanthes gracillima
• Cheilanthes lanosa
• cheilitis
• cheiloschisis
• cheilosis
• Cheiranthus
• Cheiranthus allionii
• Cheiranthus asperus
• Cheiranthus cheiri
• Chekhov
• Chekov
• chela
• chelate
• chelate compound
• chelated