11.1 All measurements are metric. For dimensional measurements, if both length and width are desired, the measurements are given as length times width (e.g., stem leaves 5.0 mm x 2.5 mm). In case of discontinuous states found in a measurement beyond the normal range of a taxon, such as an extreme measurement of leaf length, the use of parentheses to indicate this state is recommended [e.g., leaves 2-5(-10) mm long].