Technical Abstract: Understanding the homeostatic mechanisms that delineate nutrient accumulation and remobilization in cuphea will help toward its development as a competitive industrial oilseed crop. Temporal dynamics of 14 nutrient densities, their interrelationships and remobilization from leaves to seeds were quantified in growth chamber and field studies. Temporal nutrient densities in leaf samples exhibited large levels of variation (C.V. 15.0-55.0%), whether remobilized and largely accumulated in the seed (Cu, K, P, S and Zn), remobilized and accumulated, primarily in the seed coat, in low densities (B, Ca, Fe, Mg, Mn, and Na), or almost excluded from the seed (Ba, Se, and Sr). Differences between the embryo and the seed coat accounted for >80.0% of total variation in most nutrients, except Fe (37.3%) and Mn (7.6%), with significantly larger densities of Cu, Fe, Mg, P, S and Zn in the embryo. The temporal seed-to-leaf nutrient density [S]/[L] ratios and the proportion of variance unique to each nutrient (1-R**2) separated the nutrients into a group (Cu, Fe, S, and Zn) with large [S]/[L] ratios and large unique variances, and another group (B, Ca, Mg, Mn and Sr) with small [S]/[L] ratios and small unique variances; the first, but not the second group, was selectively remobilized and stored in the developing embryo. Nutrients with large densities in leaves at harvest (e.g., Ca, Fe, P, K, and S) may constitute a resource potentially available for subsequent crops. This information would help plant breeders exploit genotypic variability in seed nutrient density and agronomists identify critical nutrients and plan fertilizer programs for this potential oilseed crop.