Euphorbia hexagona Nutt. ex Spreng.
|Enumeration of the Species of Plants Collected by Dr. C. C. Parry, and Messrs. Elihu Hall and J. P. Harbour, during the Summer and Autumn of 1862, on and near the Rocky Mountains, in Colorado Territory, lat. 39°-41°|
Asa Gray (1863) Proceedings of The Academy of Natural Sciences of Philadelphia 15: 55-80
|Phytochemistry and Systematics of the Euphorbiaceae|
David S Seigler (1994) Annals of the Missouri Botanical Garden 81: 380-401