The petiole is hairy and there are between thirty and forty narrow triangular lobes up to 16 mm (0.63 in) long on each side of the leaves.

[1][2][3] This species was first formally described in 1996 by Alex George who gave it the name Dryandra porrecta and published the description in the journal Nuytsia from specimens he collected near Woodanilling in 1986.

[3][4] The specific epithet (porrecta) is from the Latin porrectus, in turn from porrigo meaning "to spread out" or "to extend", referring to the prostrate habit.

[5][6] Banksia porrecta grows in low kwongan, often with sedges and mallee eucalypts, in scattered locations between Woodanilling and Tenterden.

[7] Banksia porrecta is classified as "Priority Four" by the Government of Western Australia Department of Parks and Wildlife,[1] meaning that is rare or near threatened.