Which Indigenous California groups shared cultural traditions with peoples of the Southwest?

Indigenous California groups that shared cultural traditions with the peoples of the Southwest were primarily those residing in the Colorado River valley.1

Specifically, the Mojave and the Quechan (Yuma)—collectively known as River Yumans—maintained cultural ties with the Indigenous peoples of the American Southwest. Their cultures integrated traditions from both the California and Southwest culture areas. For example, unlike many other California groups that relied primarily on hunting and gathering, these river-dwelling peoples practiced agriculture, cultivating crops such as corn, beans, melons, and pumpkins in the fertile silt left by the annual flooding of the Colorado River.1234