There are four known subspecies, most of them occurring solely in
Portugal:
Euphorbia paniculata subsp.
calcicola (U.Schwarzer & Vicens):Native to the
Sagres Peninsula in the extreme southwest of Portugal.
Euphorbia paniculata subsp.
monchiquensis ((Franco & P.Silva) Vicens, Molero & C.Blanché): Native to the
Monchique Range in southwest Portugal. Classified as
Near Threatened.
Euphorbia paniculata subsp.
paniculata: Native to the
Iberian Peninsula and the northern littoral
Maghreb.
Euphorbia paniculata subsp.
welwitschii ((Boiss. & Reut.) Vicens, Molero & C.Blanché): Native to the area that comprises
Estremadura in western central Portugal. Classified as Near Threatened. ==References==