Lewis & Short

quinquĕfŏlĭus, a, um, adj. [quinquefolium].

  1. I. Five-leaved: rosae, Plin. 21, 4, 10, § 24.
  2. II. Subst.: quinquĕfŏlĭum, ĭi, n., a plant, cinque-foil, Cels. 2, 33 fin.; Plin. 25, 9, 62, § 109.