The compositions of the epicuticular waxes of grassesAgropyron desertorum, Bromus inermis, Elymus cinereus, Elymus junceus, Festuca ovina, andPhleum pratensehave been determined. Hexacosanol was the principal component of wax ofA. desertorumandP. pratense, and octacosanol, of wax ofE. junceus; C40–C60esters were major components of wax ofB. inermis. Hentriacontane-14, 16-dione and the 25-hydroxy derivative were the principal components of wax ofE. cinereus, and the major constituent of wax ofF. ovinawas tritriacontane-12, 14-dione. The two β-diketone-containing grasses were glaucous.