Choy sum Choy sum Choy sum (also spelled choi sum or "Cai Xin" in modern Pinyin) is a leafy vegetable commonly used in Chinese cuisine. It is a member of the genus "Brassica" of the mustard family, Brassicaceae ("Brassica rapa" var. "parachinensis" or "Brassica chinensis" var. "parachinensis"). Choy sum is a transliteration of the Cantonese name (), which can be literally translated as "heart of the vegetable". It is also known as Chinese Flowering Cabbage. Choy sum is a green leafy vegetable similar to gai lan, and can be characterized by the distinct yellow flowers which it bears. Each flower has four
Bok Tower Gardens only. To make an appointment, the Bok Tower librarian should be contacted. The Chao Research Center Archives was formed in 2008, after a generous donation made by the Ting Tsung and Wei Fong Chao Foundation. With this donation, space was made available on the second floor of the Singing Tower to accommodate a growing need for delicate archival documents. The Chao Research Center Archives stores the official archives of Bok Tower Gardens along with other significant collections. These significant collections include the Nellie Lee Bok Collection, American Foundation Collection, and Edward Bok Newspaper Scrapbook Collection. The Nellie Lee Bok Collection