The monophyly of Scilloideae is well supported by studies based on molecular data. These studies also give support to the exclusion of "Camassia", "Chlorogalum" and related genera, i.e. the former Hyacinthaceae subfamily Chlorogaloideae, now placed in the subfamily Agavoideae. The exact position of the Scilloideae within the broadly defined Asparagaceae is less clear. One possible phylogeny for the seven subfamilies recognised within the family is shown below. Although generally agreeing on the main division of the Asparagaceae into two clades, studies have produced slightly different relationships among the Agavoideae, Aphyllanthoideae, Brodiaeoideae and Scilloideae. For example, Seberg et al. (2012) present analyses based on parsimony and on maximum likelihood. In the first, the Scilloideae are sister to the Agavoideae; in the second, they are sister to the Brodiaeoideae. Detailed historical accounts of taxonomic issues relating to the modern subfamily Scilloideae have been provided by Pfosser & Speta (1999) and Chase et al. (2009). The lilioid monocots have long created classification problems. At one extreme, e.g. in the Cronquist system of 1968, they have been regarded as one large family (Liliaceae "sensu lato"). At the other extreme, e.g. in the Dahlgren system of 1985, they have been divided between orders and split into many often small families. Dahlgren divided the lilioid monocots in search of monophyly, but in practice he was unsuccessful. His major contribution was to split the Liliaceae into two families, the true Liliaceae, Liliaceae "sensu stricto", and the Hyacinthaceae (families which are now placed in separate orders, Liliales and Asparagales). Splitting off the Hyacinthaceae from the Liliaceae was originally suggested by Batsch in 1786. Batsch's version of the family only superficially resembles the modern version, but did include "Hyacinthus" and "Lachenalia". The group was reduced to a tribe by Endlicher in 1836, and included "Camassia". In 1866 Salisbury redistributed the genera into several families.