Q:Euphorbia pentagona is a medium-green Euphorbia; starts off as having a pentagonal prism shape where each vertex is extruded outwards and each side is a mild concavity along the height of the euphorb. Spines red in colour when fresh exit the body along each extrusion at equal intervals. As the spines age they tend to lose their colour. The cross-sectional polygonal shape can gain extra vertexes as new branches grow from the sides. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Plant