Hypericum hirsutum is a downy perennial plant that grows to two or three feet.

Hypericum hirsutum is a flowering plant in the genus Hypericum commonly known as hairy St John's wort.

The larvae feed on Hypericum hirsutum, Hypericum montanum and Hypericum perforatum.

Miquelianin (quercetin 3-O-glucuronide) is a flavonol glucuronide, a type of phenolic compound present in wine, in species of St John's wort, like Hypericum hirsutum, in Nelumbo nucifera (Indian lotus) or in green beans.