Cypress spurge
(Euphorbia cyparissias)
Cypress spurge is a low-growing perennial that overwinters as root and crown tissue. Cypress spurge reproduces by seed and lateral root buds. Leaves are linear, approximately 1/2 to 1 1/4 inches long, and 1 to 2 mm wide. Upper stem leaves that occur near the inflorescence are yellow or yellowish-green in color. Leaves are stalkless, alternate, narrow, and linear to lance-shaped. Stems are 4 to 32 inches high, hairless, green to yellowish-green in color, and branch in the upper portions. The leaves and stems emit a milky, toxic sap when broken. Flowers are yellowish-green usually turning reddish-green towards maturity and are clustered in bunches at the ends of stems.
Access the EDDMapS distribution map for Cypress Spurge in Colorado by clicking the image below.
Access the USGS INHABIT suitability model for Cypress Spurge in Colorado by clicking the image below.
INHABIT is an online tool created by the USGS that provides species distribution models for various invasive plant species. The models associate known occurrences of a species with environmental characteristics to create maps that predict habitat suitability, and these maps can be used to assess the potential spread of noxious weeds. Learn more about INHABIT: https://www.usgs.gov/centers/fort-collins-science-center/science/inhabit-a-web-based-decision-support-tool-invasive