The System Garden at Melbourne University

"Established in 1856, the System Garden is one of the oldest teaching gardens in the country. Plants in the garden are arranged into subclasses and families, giving visitors the opportunity to learn by comparing the form and flower structure of different plant families."

Gardening Australia have done a segment on the garden if you are interested in learning a bit more. If you are in the area and can plan a visit there are also in person and virtual tours showcasing sustainability and biodiversity around the university.