1. The czar of Russia whose plans to liberalize the government of Russia were unrealized because of the wars with Napoleon (1777-1825)
   - Alexander I, Czar Alexander I

Type of: czar, tsar, tzar

• genus Dictamnus
• genus Dictostylium
• genus Dictyophera
• genus Didelphis
• genus Dieffenbachia
• genus Diervilla
• genus Difflugia
• genus Digitalis
• genus Digitaria
• genus Dillenia
• genus Dimetrodon
• genus Dimocarpus
• genus Dimorphotheca
• genus Dinornis
• genus Diodon
• genus Diomedea
• genus Dionaea
• genus Dioon
• genus Dioscorea
• genus Diospyros
• genus Diphylla
• genus Dipladenia
• genus Diplococcus
• genus Diplodocus
• genus Diplopterygium