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14 chromosomes A. F. YEAGER Agricultural Experiment Station Anna Amhoff Apple Rose azaleas backcross Bee Balms bloom breeding Calla chromosome number colchicine Coleus common lilac conifers cuttings taken diploid Distributed for testing double ﬂowered Durham Pillar dwarf evergreens E. B. RISLEY E. M. Meader evergreens F1 population ﬁeld ﬁne ﬁrst ﬂorets ﬂower color foliage frost fully winter hardy genetic dwarfs gloxinia Grafton Pillar Granite Pink Granite Series green greenhouse grown Hampshire Agricultural Experiment horticultural hybrid perpetual hybrid tea James Macfarlane japonicum Juniper leaf leaves Lilac This variety Monarda multiﬂora type N. H. Agr native Nellie Bean Oratam ornamental petals pink ﬂowers pollen parent poukhanensis produced progeny propagate from softwood purple R. B. PIKE rambler rose Rosa virginiana Rosa wichuraiana roseum second generation seedling seedling selection Skinners Rambler softwood cuttings species Sweetbriar Syringa vulgaris testing as N. H. tetraploid viable seeds vigorous viscosum white ﬂowers White Mountains witches brooms