Intraspecific Variation in Nickel Tolerance and Hyperaccumulation among Serpentine and Limestone Populations of (Brassicaceae: Alysseae) from the Iberian Peninsula.

(Desf.) Jord. & Fourr.

Phylogenetic and geographic distribution of nickel hyperaccumulation in neotropical Psychotria.

Premise: Hyperaccumulation of heavy metals in plants has never been documented from Central America or Mexico. Psychotria grandis, P. costivenia, and P.