Common sow thistle (Sonchus oleraceus).

Romaine lettuce

A long-leafed variety of lettuce, Lactuca sativa var. longifolia.

(printing) Two letters on one shank; a ligature. / An item of mail requiring double postage.

sleepy sickness

A letter conveyed by a ship other than a mail packet.

A plant used in salads, lamb's lettuce or mâche, Valerianella locusta

plural of letter column

Section of a periodical in which readers' letters are published.

(dated, fandom slang) Correspondence, usually a letter, sent to a periodical commenting on either the contents of a previous issue or an earlier letter of comment.