the 1990s, both morphological and molecular evidence began to build that Drosophyllum differed from the other genera in the Droseraceae, Drosophyllum, another monotypic genus (Drosophyllum lusitanicum being the only species), exhibits a flypaper-type trap similar to those of Drosera, but Drosophyllum does not actively curl its leaves to envelop captured prey animals. This important morphological distinction led researchers to question the validity of this taxon's placement in Droseraceae. Other significant trait differences in Drosophyllum include pollen structure, trichome anatomy, and a woody stem with a deep taproot. Ultimately, Drosophyllum was shown to be more closely related to the carnivorous liana Triphyophyllum and the noncarnivorous liana Ancistrocladus, and is, thus, classified elsewhere (to be specific, its own monotypic family Drosophyllaceae). and APG III (2009) placed it into its own family, the Drosophyllaceae. This left only the three genera (Dionaea, Aldrovanda, Drosera) that are classified as Droseraceae today. Despite some debate, taxonomists have tended to include at least two of these three genera, and, in general, all three, in this family since at least 1906. Separate families for Dionaea and Aldrovanda have been proposed in the past. These were Dionaecae, proposed in 1933, and Aldrovandaceae, proposed in 1949. Ultimately, molecular and morphological evidence support the inclusion of all three, confirming that the Droseraceae are a monophyletic group. Molecular evidence also shows that the two genera with traps that snap shut (Dionaea and Aldrovanda) are more closely related to each other than to Drosera, suggesting snap traps evolved only once. The family Droseraceae is part of the order Caryophyllales in the Superasterid clade within the core eudicots. The family totals nearly 200 species. Caryophyllales are divided into two major suborders: Caryophyllineae, which contains the "core" Caryophyllales, such as Cactaceae and Amaranthaceae and is sister to the Polygonineae – the "non-core" Caryophyllales. This non-core clade is where Droseraceae is placed. Recent molecular and biochemical evidence (see the AP-Website) suggests the carnivorous taxa in the order Caryophyllales (the families Droseraceae, Drosophyllaceae, Nepenthaceae, and the species Triphyophyllum peltatum) all belong to the same clade, which does not consist only of carnivorous plants, but also of some noncarnivorous plants such as those in the family Ancistrocladaceae. The fossil record of Droseraceae is the richest of any carnivorous plant family. Fossil pollen has been attributed to several extant, as well as extinct, genera, although some are of questionable validity. Evolution Darwin concluded that carnivory in plants was convergent,