annual bluegrass Directory References Images Discover The Largest Islands in the World The Lost Colony of Roanoke New Seven Wonders of the World Where Is the Ark of the Covenant? Who Really Invented Baseball? The 6 Deadliest Earthquakes Since 1950 Uninvited Guests: The 7 Worst Parasitic Worms Contents Ask the Chatbot a Question annual bluegrass plant Ask the Chatbot a Question Also known as: Poa annua Learn about this topic in these articles:classification In bluegrassAnnual bluegrass (P. annua), a small, light-green species, is a European introduction that has spread throughout North America; it is considered a pest in lawns.Read More Britannica ChatbotChatbot answers are created from Britannica articles using AI. This is a beta feature. AI answers may contain errors. Please verify important information using Britannica articles. About Britannica AI.