Xerophyllum asphodeloides is a North American species of flowering plants in the Melanthiaceae known by the common names turkey beard, eastern turkeybeard, beartongue, grass-leaved helonias, and mountain asphodel.
 It is native to the eastern United States, where it occurs in the southern Appalachian Mountains from Virginia to Alabama, and also in the Pine Barrens of New Jersey.
Xerophyllum tenax is a North American species of plants in the corn lily family.
 It is known by several common names, including bear grass, squaw grass, soap grass, quip-quip, and Indian basket grass.
Xerophyllum is a genus of perennial plants from the family Melanthiaceae.
 The genus is native to North America.
Arthrocereus is a genus of cactus, originating from southern Minas Gerais, Brazil.

Question: Are Xerophyllum and Arthrocereus both plants?
Answer: yes