Arzabe A., Aguirre L. F., Baldelomar M., Pollination system of two endemic Bolivian cacti: Harrisia tetracantha and Neoraimondia herzogiana, Bradleya, 2018, 36:178-188, doi: 10.25223/brad.n36.2018.a13
A comparison of fruit set in enclosed flowers and flowers freely accessible to animals in two populations of Bolivian cacti. It examines flower structure, opening duration and visitor contact with reproductive organs.