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
Wilbur Wong Yan Choy the Executive Committee of the National Conference of Chinese Churches. Bishop Choy was an active member of the Board of Trustees of the Pacific School of Religion from 1970 until 1984. As such, he worked to strengthen the School's focus on Pacific Basin cross-cultural dialogue, diversity and excellence in ministry. Bishop Wilbur W.Y. Choy was named a "Distinguished Alumni/ae" of the Pacific School of Religion in 1997. Bishop Choy retired in 1984. Chairperson of the Board of Trustees of the Pacific School of Religion, Mr. Robert Riddel, wrote in 1984 on behalf of the Board: Wilbur Wong Yan Choy Wilbur