Brassicaceae greens, Savoy, kohlrabi, and gai lan ("Brassica oleracea"), turnip, napa cabbage, bomdong, bok choy and rapini ("Brassica rapa"), rocket salad/arugula ("Eruca sativa"), garden cress ("Lepidium sativum"), watercress ("Nasturtium officinale") and radish ("Raphanus") and a few spices like horseradish ("Armoracia rusticana"), "Brassica", wasabi ("Eutrema japonicum"), white, Indian and black mustard ("Sinapis alba", "Brassica juncea" and "B. nigra" respectively). Vegetable oil is produced from the seeds of several species such as "Brassica napus" (rapeseed oil), perhaps providing the largest volume of vegetable oils of any species. Woad ("Isatis tinctoria") was used in the past to produce a blue textile dye (indigo), but
Choy Li Fut district and called it Siu Buk Hung Sing Choy Li Fut. Eventually it was shortened to Buk Sing Choy Li Fut. Tam Sam's students referred to themselves as the Buk Sing branch of Choy Li Fut. A Northern Shaolin master named Ku Yu Jeung (aka Gu Ruzhang) befriended and joined Tam Sam and thus added more techniques to the Buk Sing Choy Li Fut curriculum. What makes Buk Sing Choy Li Fut a unique branch is that it concentrates on the application of Choy Li Fut techniques rather than the practice of forms. Because the emphasis is on combat applications,