Number of locules

Inside the ovary, the ovules are borne on a specialised tissue called the placenta, and any crosswall or partition inside the ovary is called a septum; together the ovary walls and any septa enclose one or more chambers called locules. Ovaries are named directly by their locule count: unilocular ovaries have a single chamber (pea, groundnut); bilocular ovaries have two chambers (mustard, Crossandra); trilocular ovaries have three chambers (banana, Euphorbia); and, following the same pattern, tetralocular and pentalocular ovaries have four and five …