桧

桧木

guì mù

false cypress (genus Chamaecyparis)

桧柏

guì bǎi

Chinese juniper (Juniperus chinensis)

秦桧

qín huì

Qin Hui (1090-1155 AD), Song Dynasty official said to have betrayed General Yue Fei 岳飛|岳飞[Yue4 Fei1]

红桧

hóng guì

Formosan cypress, aka Taiwan red cedar (Chamaecyparis formosensis)