Cactus seemannii Placement status: unresolved name – to be further revisedCactus seemannii (Sheer) Kuntze, Revis. Gen. Pl. 1: 261. 1891 sec. Britton & Rose 19231≡Mammillaria seemannii Scheer, Bot. Voy. Herald: 288. 1856 syn. sec. Britton & Rose 192311. Britton, N. L. & Rose, J.N. 1923: Cactaceae 4Content