Malus coronaria Malus coronaria Malus coronaria, also known by the names sweet crabapple or garland crab, is a North American species of "Malus" (crabapple). It grows primarily in the Great Lakes Region and in the Ohio Valley, with outlying populations as far away as Alabama, eastern Kansas, Long Island, and Ontario. "Malus coronaria" often is a bushy shrub with rigid, contorted branches, but frequently becomes a small tree up to 10 meters (33 feet) tall, with a broad open crown. It prefers rich moist soil. Its flowering time is about two weeks later than that of the domestic apple, and its fragrant
Étienne-Louis Malus Étienne-Louis Malus Étienne-Louis Malus (; ; 23 July 1775 – 24 February 1812) was a French officer, engineer, physicist, and mathematician. Malus was born in Paris, France. He participated in Napoleon's expedition into Egypt (1798 to 1801) and was a member of the mathematics section of the Institut d'Égypte. Malus became a member of the Académie des Sciences in 1810. In 1810 the Royal Society of London awarded him the Rumford Medal. His mathematical work was almost entirely concerned with the study of light. He studied geometric systems called "ray systems", closely connected to Julius Plücker's "line geometry". He conducted