Rhamnus crocea or Spiny Redberry is an evergreen shrub typically reaching 3 feet in height and as much as 6 feet in width. Its small, deep green leaves are dotted with bright red berries which appear after the blooms fall between April and May. Characterized by large thorns, Spiny Redberry dot the northeast end of the Yawkey Trail. Known by local entomologists as one of two host plants for the endangered Hermes Copper butterfly, Mt. Helix Park is fortunate to have many healthy specimens.