Abstract
In 1955, a clone of Chrysanthemum rupestre MATSUMURA et KOIDZUMI was obtained from the serpentine-zone near the top of Mt. Tanigawa (1, 963m). The plant is characterized by the dwarf form as follows: (1) Heads are few and arranged in corymbs on a stem; each of these heads is about 1.5mm in diameter, without ligulate florets, but with 12-15 tubular ones (yellow). (2) The stem is about 7-9cm in length, posessing no branch at the upper part and few creepers at the lower one.
In 1956, the root-tip cells were cytologically examined by the TJIO-LEVAN's method (1950). The results are asfollows: (1) The somatic chromosome number of the plant found in the above-mentioned zone of Mt. Tanigawa is 18 (Fig. 1). (2) Apparently it is one of the Chrysanthemum-diploids.
