Fragments of Martialis's work (probably called De hortis), which treated of the cultivation of trees and vegetables, and also of their medicinal properties, survived, chiefly in the body of and as an appendix to the Medicina Plinii (an anonymous 4th century handbook of medical recipes based upon Pliny the Elder, Naturalis Historiae, xx–xxxii). Extant sections treat of apples, peaches, quinces, citrons, almonds, chestnuts, parsnips, and various other edibles, with an emphasis on the medical effects they have on the body (quoting Dioscorides sometimes). (Adapted from Wikipedia article on Quintus Gargilius Martialis.) Digital facsimile of the 1875 edition from Google Books at this link.