Are Deppea and Crambe in the same family?
no
Crambe
Crambe is a genus of about 20 species of annual and perennial flowering plants in the cabbage family Brassicaceae, native to a variety of habitats in Europe, Turkey, southwest and central Asia and eastern Africa.
 They carry dense racemes of tiny white or yellow flowers on (mostly leafless) stems above the basal leaves.
Deppea
Deppea is a genus of flowering plants in the family Rubiaceae.
 The genus is found in Mexico, Central America and from Brazil to northeastern Argentina.
Crambe maritima
Crambe maritima (common name sea kale, seakale or crambe) is a species of halophytic flowering plant in the genus "Crambe" of the family Brassicaceae (Cruciferae), that grows wild along the coasts of Europe, from the North Atlantic to the Black Sea. Crambe (sponge)
Crambe is a genus of demosponges belonging to the family Crambeidae. Crambe cordifolia
Crambe cordifolia, syn.
 "Crambe glabrata" DC.
 (greater sea-kale, colewort, heartleaf crambe) is a species of flowering plant in the family Brassicaceae, native to the Caucasus.
 Growing to 2.5 m tall by 1.5 m broad, it is a substantial clump-forming herbaceous perennial with kidney-shaped dark green leaves, 35 cm or more in length, which die down in mid- to late summer.
 It is widely cultivated in gardens for its foliage and spectacular multi-branched inflorescences of many small, white, cruciform (cross-shaped) flowers, reaching up to 2 m high and appearing in early summer. Crambe crambe
Crambe crambe, the oyster sponge or orange-red encrusting sponge, is a species of demosponges belonging to the family Crambeidae.