Q:Asclepias uncialis - Asclepias uncialis is a species of flowering plant in the dogbane family known by the common name wheel milkweed. It is native to the western United States. Two subspecies are sometimes described with ssp. ruthiae containing three plants which are sometimes described as separate species Asclepias ruthiae A. eastwoodiana and A. sanjuanensis.This species is a small perennial herb with stems just a few inches long. Like most other milkweeds the stems contain a milky sap. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Plant