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科字母索引：
A B C D E F G H I J L M N O P R S T U V W X Z

科拉丁名	科下属拉丁名
Icacinaceae	Desmostachys; Iodes; Mappia; Natsiatum; Nothapodytes; Phytocrene; Pittosporopsis;
Iridaceae	Belamcanda; Crocus; Gladiolus; Iris;
Irvingiaceae	Irvingia;
Iteaceae	Itea;
Ixonanthaceae	Ixonanthes;