There are various differentiating indicators to look out for when trying to identify the various St. John's Worts and Tutsans. The first is whether or not there are black dots on either the sepals or the petals or on both, and whether there are also any red dots. The second is to ascertain whether or not there are any black dots on the leaves (and if so which surface, upper or lower) and whether or not there are any translucent dots (best seen by transmitted light). The third is whether or not there are any fine ridges or lines on the stems, and if so, whether there are two or four. A fourth is whether or not the stem is round or square. These are the main identifying features, but size of flower and proportionate length of petals to sepals are further attributes helping identification.