The exhibition, which began about 10 days ago on the forest's ground floor, focuses on medicinal plants and the origins of plant medicine.
An interpretive panel points out that herbalism, the study of plant medicine, can be traced back about 5000 years to Sumeria, now Iraq.
The Greek physician Dioscorides had suggested that mint be used to stop bleeding, and to "amend an ill-favoured breath".
A display panel on Maori medicine says that "rokoa" in Maori culture refers to a body of knowledge about health and wellbeing that includes physical, emotional, spiritual, and mental health.
The gum from harakeke (flax) was used for healing wounds and chafed areas, and the root relieved constipation.
"I just want an appreciation of plants really," Ms Morrison said about her aims for the display.
She wanted to show that plants are "this amazing resource", and to provide different perspectives.
Many effective medicines were derived from plants, including asprin (willow bark) and the heart medication digoxin (foxgloves).
Only about 1% of plants in tropical forests had been tested for their medicinal properties, she said.
The display is expected to run until late September.
