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Which Caryophyllales families are restricted to southwestern North America?

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Caryophyllales Pink carnation flowers (*Dianthus caryophyllus*).

Within the order Caryophyllales, two families are found exclusively in southwestern North America:

Sarcobataceae: This family consists of two species.1
Simmondsiaceae: This family consists of a single species.1

While other families within the order, such as Portulacaceae, have a strong presence in the arid regions of western North America, they are not restricted to that geographic area and maintain a worldwide distribution.1