In this paper, we consider complex differential systems in the neighborhood of a singular point with eigenvalues in the ratio 1 : −λ with λ ∈ . We address the questions of orbital normalizability, normalizability (i.e., convergence of the normalizing transformation), integrability (i.e., orbital linearizability), and linearizability of the system. As for the experimental part of our study, we specialize to quadratic systems and study the values of λ for which these notions are distinct. For this purpose we give several tools for demonstrating normalizability, integrability, and linearizability.