Rhododendron

The Victorians labeled this bloom "beware," — which is actually appropriate, since they're quite poisonous.

On the other hand there are many benefits of the Rhododendron Herb

Rhododendrons are evergreens that belong to the same family as azaleas, with 800 species that grow around the world from Nepal to West Virginia. Parts of certain rhododendron species are toxic to both humans and animals; people have become ill just from eating honey made by bees feeding on the flowers. However, scientists are finding that extracts from other rhododendrons have properties that show promise in treating diseases.

Photo source: https://www.maxpixel.net/
Source: https://www.livestrong.com/article/548815-manuka-honey-allergic-reactions/