邦産n=10群Brassicaの莢型について

抄録

1. Some of the materials obtained from Nepal have a special type of silique : pods are thick and somewhat cylindrical, of 3-4 carpels; beaks are long and thick. Excluding this special type, pods of n=10 group Brassicas of Japan and China are of 2 car pels. 2. B. japoleica have slender pods which are fairly different from that of other species. B. campestris and B. Rapa have generally long and big pods. B. chinensis are slightly short, and many of. B, parachinensis are also short. B. ndrinosa have very short and inflated pods with short beaks. B, pekilcensis show the largest variation, bu'c most of them enter within the variation of B. campestris, B. rapa and B. chileensis; their pods are not so slender as B. japonica nor so thick as B. narilcosa. 3. B. japonica are specially treated in the classification of Brassicas, and their slender pods are somewhat like to that of B. julccea together with their small fiowers, slender petals, small and slen der vegetable features. 4. B. narileosa are much cultivated in Middle China, and they were not distributed in Japan before. However, some of Nagasaki-Hakusai and their derivatives have very short and thick pods which are like to that of B, narinosa, Nagasaki-Hakusai is said to be originated from Wan-yu Tsai of chaina, and Piaoerh 1sai which belon.gs to B. Iearinosa has leaves extending outwards and with thick petioles just like to Nagasaki-Hakusai. Therefore, NagasakiHakusai is concidered to be derived frorri B, narinosa, and it is interesting that the characters of B. narileosa remain in the pods of Nagrasaki-Hakusai in spite of the fact that many years have elapsed since rts introduction into Japan.