Abstract
It is commonly known already a strain of the crested double flowering cosmos produces 0 to 60% double flowering plants in its seedlings usually. These crested-double flowers, however, are not always of perfectly fine full-doubled (DDD-typed, signed temporarily) but of imperfect serni-(DD-typed) or slightly-doubled (D-typed) in some considerable d'efinite ratio. Furthermore, in a few cases come out the ball-shaped or aster-1ike double flowers (DDDD- typed) on the slender and much branched plants, alike some plants with the fluted (F-typed), tubulared single (T-typed) or non-petaled (N-typed) flowers. Seeds obtained from the full-doubled DDD-mother plants pollinated artificially with slightly-doubled (D) pollen segregate about 68%: double flowering., and those fertilized naturally (possibly with many pollen of single-flowering (S) and partly of slightly-doubled (D-DD)) produce about ' 50 or more % of doubleflowering seedlings in the next generation. And seeds from the imperfect semi- or slightly.-doubled plants pollinated naturally give only 14 to 47% (in 1953-!54) of double flowerin.g. Still more, it is observed freqtiently that the fluted doubled and tubulared singled flowers are found in the seedlings derived from the normal cresed doubled plants.
