ClipArt ETC
"Longitudinal section of an onion leaf. sca, thickened base of leaf, forming a bulb-scale; s, thin sheath of leaf; bl, blade of leaf; int, hollow interior of blade." -Bergen, 1896

Onion Leaf

"Longitudinal section of an onion leaf. sca, thickened base of leaf, forming a bulb-scale; s, thin sheath…