Mammillaria kleinii Placement status: name of verified uncertain applicationMammillaria kleinii Regel, Index Seminum St. Petersburg (Petropolitanus) 1860: 47. 1860 sec. Britton & Rose 19231≡Cactus kleinii (Regel) Kuntze, Revis. Gen. Pl. 1: 260. 1891 syn. sec. Britton & Rose 192311. Britton, N. L. & Rose, J.N. 1923: Cactaceae 4Content