Seed coats of nine species of Trigonella, members of Trifolieae, were studied using light and scanning electron microscopy to assess seed coat characters taxonomically. In all species, the testa is of the papillose type except T. geminiflora in which it is of the multi-reticulate type. Based on some of the seed characters such as their shape, size, surface, position of hilum and the features of papillae, a key has been developed to identify different species of this genus. Further, in a highly evolved group like section Bucerates, it has been found that the surface is either papillose without mounds or multi-reticulate. This feature has to be confirmed in more species of this genus.
"Seed Coat Structure in Some Species of Trigonella,"
Scanning Microscopy: Vol. 5
, Article 22.
Available at: https://digitalcommons.usu.edu/microscopy/vol5/iss3/22