Vallisneria spiralis "Tiger"

The Tiger vallisneria is generally known under the name Vallisneria spiralis "Tiger". According to information from Maike Wilstermann-Hildebrand, it is a form of Vallisneria nana. According to Christel Kasselmann (2010), however, many morphological features indicate that the plant belongs to V. spiralis and not to V. nana.¹ Wilstermann-Hildebrand (2010) does report, though, that the Tiger vallisneria was identified as Vallisneria nana by means of DNA analysis in the USA in 2006.²

1. Kasselmann, Christel (2010): Aquarienpflanzen. 3rd edition. - DATZ Aquarienbuch, Ulmer Verlag: p. 547.
2. Wilstermann-Hildebrand, Maike: Heimbiotop Newsletter No. 26, April 2010: p. 2.