Your support is critical to our success.
Hort. Kew. [W. Aiton] 2: 137 1789.
Work can be freely used for any purpose, even commercial one. Original author of image doesn't have to be mentioned under shared or derived work.
More about licenses and author rights.
Euphorbia balsamifera in Masca Gorge, at Tenerife, Spain (Canary Islands).