All the former cormous genera that were once considered to belong in the Liliaceae family from Mexico and Western North America are now considered to belong to Themidaceae, although some taxonomists suggest moving them back or placing them in Alliaceae. In the Flora of North America they are still considered to belong in the Liliaceae family. A recent (2002) phylogenetic evaluation concluded that Themidaceae is a monophyletic family that is sister to Hyacinthaceae within Asparagales. (See A Phylogenetic Evaluation of a Biosystematic Framework: Brodiaea and Related Petaloid Monocots (Themidaceae), J. Chris Pires and Kenneth J. Sytsma, American Journal of Botany 89(8): 1342-1359, 2002.

APG III includes this family into an expanded Asparagaceae in a branch with Hyacinthaceae by placing most taxa into the subfamily Brodiaeoideae. The type genus, Themis, had only a single species published in 1866, Themis ixioides, considered an invalid name. It is now one of the many synonyms for Triteleia ixioides. The Jepson eFlora, which contains taxonomic treatments and identification keys for native and naturalized plants occurring in California continues to include Androstephium, Bloomeria, Brodiaea, Dichelostemma, Muilla, and Triteleia in Themidaceae.

Genera of Themidaceae
Androstephium Behria Bessera
Bloomeria Brodiaea Dandya
Dichelostemma Jaimehintonia Milla
Muilla Petronymphe Triteleia

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