Mammillaria jucunda Placement status: name of verified uncertain applicationMammillaria jucunda Ehrenb. in Allg. Gartenzeitung 17: 250. 1849 sec. Britton & Rose 19231≡Cactus jucundus (Ehrenb.) Kuntze, Revis. Gen. Pl. 1: 260. 1891 syn. sec. Britton & Rose 192311. Britton, N. L. & Rose, J.N. 1923: Cactaceae 4Content