Watercolor class demonstration sketch of some Ranunculus. in a Moroccan vase.
The students names the sepals for me: “a member of the (usually green) outer whorl of non-fertile parts surrounding the fertile organs of a flower. One of the green parts that form the calyx of a flower. A specialized structure that appears in plants, usually to protect a new growing shoot, though its function can vary from species to species.” (from biology online)