When the stem passes through the blade of a leaf or through a basally connate pair of leaves.
Of a leaf, perforated by the stem.
The condition of a sessile leaf when the base completely encircles the stem.
Passing through a leaf, or appearing so.
A leaf (or a pair of conjoined opposite leaves) forming a ring around a stem.
Describes a stalkless leaf, or leaves, which encircle and enclose the stem.