Cestrum is a genus of - depending on authority - 150-250 species of flowering plants in the family Solanaceae.
 They are native to warm temperate to tropical regions of the Americas, from the southernmost United States (Florida, Texas: day-blooming cestrum, "C. diurnum") south to the Bío-Bío Region in central Chile (green cestrum, "C. parqui").
 They are colloquially known as cestrums or jessamines (from "jasmine", due to their fragrant flowers).
The Ericaceae are a family of flowering plants, commonly known as the heath or heather family, found most commonly in acid and infertile growing conditions.
 The family is large, with c. 4250 known species spread across 124 genera, making it the 14th most species-rich family of flowering plants.
 The many well-known and economically important members of the Ericaceae include the cranberry, blueberry, huckleberry, rhododendron (including azaleas), and various common heaths and heathers ("Erica", "Cassiope", "Daboecia", and "Calluna" for example).

Question: Cestrum and Ericaceae, are types of what?
Answer: flowering plants