Researchers examined the morphological and physiologocal leaf traits of dense-flowered cordgrass plants in populations from invaded estuaries and in a common garden experiment, and found phenotypic plasticity to drive differences in foliar traits. For more, please read:
Castillo, J., Grewell, B., Pickart, A., Bortolus, A., Pena, C., Figuerora, M., Sytsma, M. "Phenotypic Plasticity of Invasive Spartina Densiflora (Poaceae) along a broad latitudinal gradient on the Pacific Coast of North America". American Journal of Botany 101(3): 448-458. 2014.