Euphorbia rigida, also known as Gopher Spurge or Upright Myrtle Spurge, is a member of the genus Euphorbia. Gopher Spurge is a vascular plant

Vascular plant

Vascular plants are those plants that have lignified tissues for conducting water, minerals, and photosynthetic products through the plant. Vascular plants include the clubmosses, Equisetum, ferns, gymnosperms and angiosperms...

. It has appeared spontaneously in California wilderness but is not considered a noxious weed.

Gardening

Gopher Spurge is native to the Mediterranean Basin and the Middle East, where it is considered a weed.
Americans and Brits commonly use it in their gardens. It is a Spring blooming plant. The plants wounds leak a milky sap which can cause skin irritation.

Biofuels

Research has been done on using Euphorbia rigida as a bio fuel. It has been shown to produce 137 gallons of oil per acre.

Pyrolysis Pyrolysis Pyrolysis is a thermochemical decomposition of organic material at elevated temperatures without the participation of oxygen. It involves the simultaneous change of chemical composition and physical phase, and is irreversible...  Reactor Type:	Fixed Bed
Process Type:	Hydropyrolysis