Thalictrum speciocissimum is a species of meadow-rue (Thalictrum). It is native to Portugal and Spain on the Iberian Peninsula, and to Morocco and Algeria in northwestern Africa.
It is a species in the Betic-Rifan flora, a group of plant species common to the Baetic mountains of southern Spain and the Rif mountains of northern Morocco.Linares, Juan & García-Cervigón, Ana & Dugo-Díaz, M.L. & Garcilaso, D. & Lechuga Ordóñez, Víctor & Blanes, M.C. & Viñegla, Benjamín. (2014). "Sierra Nevada Range, the Biodiversity Legacy of the Southernmost European Glaciated Mountain", in Mountains: Geology, Topography and Environmental Concerns, António Avelino Batista Vieira and António José Bento Gonçalves, eds. Nova Science Publishers, ISBN 9781631172885
Two subspecies are accepted. Thalictrum speciosissimum subsp. albini (synonym Thalictrum albini ) – Spain Thalictrum speciosissimum subsp. speciosissimum (synonyms Thalictrum angulosum , T. cinereum , T. cuneatum , T. densiflorum , T. discolor , T. flavum subsp. glaucum , T. flavum var. speciosum , T. glaucum , T. speciosum ) – Algeria, Morocco, Portugal, and Spain
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