Malus niedzwetzkyana Malus niedzwetzkyana Malus niedzwetzkyana, or Niedzwetzky's apple, is a kind of apple native to certain parts of China, Afghanistan, Kazakhstan, Kyrgyzstan, and Uzbekistan noted for its red-fleshed, red-skinned fruit and red flowers. Some botanists consider it a distinct species, while others have argued it is simply an unusual variety of the common apple, "Malus pumila". Niedzwetzky's apple is rare, often growing as an isolated tree, and is endangered throughout its range by agricultural encroachment and logging operations. Only 111 specimens of the tree are known to survive in Kyrgyzstan. The conservation group Fauna & Flora International is working to save
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