The pachycaul tree's scientific classification is order asterales, family asteraceae and tribe cichorieae which has more than seven thousand species.
There is only one known species, Thamnoseris lacerata, commonly known as the pachycaul tree. Order: Asterales Family: Asteraceae Tribe: Cichorieae The Cichorieae (also called Lactuceae) are a tribe in the plant family Asteraceae that includes 93 genera, more than 1,600 sexually reproductive species and more than 7,000 apomictic species. 
