In the scene there is a set of Aconitum of 6 plants with purple inflorescences, located at different stages of the growing season, with a height from 30cm to 125cm.

Name: Aconitum_2_2018_corona_vray
Version: 2018

Polys: 915 711

XForm: Yes
Box Trick: Yes
Model Parts: 6
Render: Corona, Vray
Formats: 3Ds Max 2018, FBX
Material library: Corona, Vray

Those who work in a V-Ray version lower than 3.1, be careful, in the materials in the BRDF section there is Microfaset GTR (GGX), if your version is older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward - whichever is preferable for you.
For Corona render, it is recommended to install version no lower than 1.5, since the glossiness of the materials is adjusted taking into account PBR.