倍数性花卉の育成と利用に関する研究(第9報) : 新らしく育成された黄花コスモスの4倍性大輪半八重咲系統の性状について

概要

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A new tetraploid strain of Orange Ruffled Cos-mos which was induced by colchicine treatment in 1949 and bred to fully semi-double flowering for three years shows off its larger, strikingly ruffled and deeper orange yellow colored flowers, although its seedlings grow rather slowly and begin to bloom later than diploid plants. The plant habit is disti-nctly dwarf and the leaves are much thicker and wider. Size of seeds is very large but the fertility is exceedingly lower (about 8%) than diploid. The writer assures that this new “Tetraploid Orange Ruffles” will much suitable for an orange coloring material in summer and fall gardens ma-king a nice contrast with flaming scarlet salvias or celosias.
園芸学会の論文