The effects of chemical reaction, viscous dissipation and pressure work are included in a three-parameter perturbation analysis in magnetohydrodynamic free convection flows of Newtonian fluid-saturated porous medium. The Rosseland approximation is used to describe the radiative heat flux in the energy equation. Four different cases of flows have been studied namely an isothermal surface, a uniform surface heat flux, a plane plume and flow generated from a horizontal line energy source along a vertical adiabatic surface. Numerical results are presented for the perturbation analysis for the four boundary conditions. The obtained results are compared and a representative set is displayed graphically to illustrate the influence of the parameters on the velocity, temperature and concentration.