As a name, setsugekka is composed of three parts: snow (setsu), moon (getsu), and flowers (ka).
Setsugekka no toki mottomo kimi wo omou
…from an ancient poem, translates into When I see the snow, moon, or flower, I always think of you. (source). Yasunari Kawabata, in his acceptance speech for the Nobel Prize for Literature in 1968, discussed the phrase setsugekka; Professor Isamu Kurita goes into more details in an article entitled “Japanese Art and the Japanese View of Nature“.
Read a little bit about this plant via Great Plant Picks: ‘Setsugekka’ autumn camellia.
Botany resource link: Economic Uses of Algae, a small site produced by the Smithsonian Institution. The secondary products pages are worth a read.