Abstract The volatile oil of lemongrass was found in the blade to occur in rows of cells located immediately below the bands of bulliform cells. In the sheath the rows of oil cells are embedded in the central part of the fundamental parenchyma. Such cells also occur in the joint triangles. No oil cells occur in the ligule, the auricles, or the culm. The oil cells, when freed of oil, are similar in appearance to some adjacent parenchyma but can easily be distinguished by the effect of phloroglucin‐hydrochloric acid on the walls. The detailed structure of the parts of the leaf is illustrated and described.