Sánchez-Mata, Daniel, Vicenta de la Fuente, Lourdes Rufo, Nuria Rodríguez, and Ricardo Amils. “Streptanthus purpureus sp. nova (Cruciferae), an endemic nickel hyperaccumulator from Sierra Nevada (California, USA)”. Lazaroa, vol. 34, vol. 34, 2013, pp. 275-83, doi: https://doi.org/10.5209/rev_LAZA.2013.v34.n1.43643.