Question: What is similar about Chilopsis and Lenophyllum? 

Context paragraphs:
Lenophyllum: Lenophyllum is a genus of flowering plants in the orpine family, Crassulaceae.  The roughly seven species it contains are distributed in Texas in the United States and northeastern Mexico.  Some authorities place it in the genus "Sedum".  Plants in this genus are distinguished from "Sedum" species by the presence of terminal inflorescences, erect petals, and opposite leaves.  The name is derived from the Ancient Greek words ληνός ("lenos"), meaning "trough", and φυλλον ("phyllos"), meaning "leaf."

Chilopsis: Chilopsis is a monotypic genus of flowering plants containing the single species Chilopsis linearis.

Supporting paragraphs: Chilopsis Lenophyllum
Answer: genus of flowering plants