Examples from the Web for leaf sheath
The leaf-sheath is glabrous, slightly compressed, distinctly keeled, as broad or slightly broader than the blade at the mouth.
The leaf-sheath embracing the peduncle is longer than the lower sheaths.
From each joint grows a leaf-sheath which is wrapped round the stem for a little distance above the joint.Wildflowers of the Farm|Arthur Owens Cooke
The leaf consists of the two parts, the leaf-sheath and the leaf-blade.
The leaf-sheath is glabrous and smooth, ribbed, the lower short and the upper very long.