Ottley Acmispon glaber (previously Lotus scoparius) (common deerweed, deer weed, deervetch, California broom or western bird's-foot trefoil) is a perennial subshrub in the family Fabaceae (pea family).

[1] The plant is a pioneer species found in dry areas of California, Arizona, and Mexico.

It is commonly found in many areas including chaparral, coastal sand and roadsides at elevations below 1500 m. The Acmispon glaber stems are green, erect, somewhat branched, with small, deciduous, pinnate leaves consisting of three to six leaflets.

Acmispon glaber is a food consumed by numerous wildlife, providing intake for hummingbirds, bees, butterfly larvae, and deer.

[6] Due to their seeds' fire adaptation, Acmispon glaber benefits from heat scarification in cultivation.