Robbrechtia includes shrubs and small trees characterized by a blackened drying color; well developed, caducous, notably resinous stipules that are shortly fused around the stem with the interpetiolar portions obtuse to acute; rather leathery leaves; terminal, sessile, cymose, bracteate inflorescences that are generally rounded in shape and subtended by enlarged stipules; bisexual, homostylous flowers with secondary pollen presentation; 5 or rarely 4 calyx lobes, corolla lobes, and stamens; a relatively well developed calyx limb; salverform, white to yellow corollas with a long slender tube (26-35 mm long) and the lobes contorted to the left in bud; 2-locular ovaries with 2-4 ovules in each locule; drupaceous fruits with a single 2-locular pyrene that opens from the base; and generally only 1 seed per fruit, which has a large lateral hilum cavity and deeply ruminate endosperm. This genus can be recognized in part by its leathery leaves, robust resinous stipules, well developed calyx limbs, and blackened drying color. The flowers are reported to be very fragrant.
Robbrechtia is similar in general aspect and many characters to Coptosperma, but has longer corollas and calyx limbs than species so far known of that genus, and also differs in its bilobed stigmas vs. entire in that genus. Robbrechtia grandifolia is much more commonly collected and widely distributed than Robbrechtia milleri.