Fig. 1 in Myriophyllum rubricaule sp. nov., a M. aquaticum look-alike only known in cultivation

Fig. 1. Plants, prior to collection, of M. rubricaule Valk. & Duist. sp. nov. (Valkenburg 3495; red stem) growing amidst M. aquaticum (Valkenburg 3494; green stem) in an artificial pond at a golf course, illustrating the more modest dimensions and color differences (13 July 2009, Grashoek, the Netherlands).