Courtesy A. J. Turgeon
The most visible components of grass plants are the alternately occurring leaves. The lower portion is called the leaf sheath while the upper portion is the leaf blade. At the junction of the blade and the sheath on the inner side is the ligule; on the outer side is the collar. In some grasses, the base of the leaf blade extends into two appendages called auricles. At the base is the crown. Elongation of the stem internodes occurs during flowering when a culm emerges and terminates in an inflorescence. Other stems include those associated with rhizomes and stolons. Roots of a grass plant are of two types: seminal and adventitious. In a new turfgrass plant from seed, a rhizomelike structure, called a mesocotyl, may be present.