| Resumo: | Magnolia rzedowskiana A. Vázquez, R. Domínguez & R. Pedraza is described as a new species of the sect. Macrophylla. It is found in Sierra Gorda, Querétaro, Sierra de Xilitla, San Luis Potosí, and vicinity of Chapulhuacán, Hidalgo, México, in cloud forests. It shares with other members of sect. Macrophylla its deciduous and abaxially glaucous leaves. It is similar to Magnolia dealbata in having similar size of trees and leaves, but differs from the latter in having narrower petals, less numerous stamens, styles flattened, acute at the apex and white yellowish to dark maroon (vs. cylindrical and truncate to rounded at the apex and creamy white), smaller fruits, less numerous carpels, and carpels with shorter beak.
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