The Floral Receptivity of Ulmus Americana L.

23 progenies alternate AAAA According ALTERNATE PHYLLOTAXY DIFFERENT alternate to opposite American elm anther dehiscence appear applied arrangement artificial assume AVERAGE began blooming branches breeding calyx changes collected color controlled counted cross cumulative frequency CUMULATIVE PERCENTAGE CURVE DIFFERENT FLORAL STAGES DISCUSSION divergent dominant Duncan's multiple range Earlier expected FACTOR female FIGURE fitness floral biology Floral development stage FLORAL RECEPTIVITY flower forced fruit genetic genotype of tree greenhouse hybridization important inbreeders later leaf leaves Lester Library maternal maximum MEANS METHODS multiple range test natural NODE observed occurred outbreeders ovary hair pair parents pattern PHYLLOTAXY DIFFERENT FLORAL pointed pollen shedding pollination present produced PROGENIES ALTERNATE PHYLLOTAXY ratio relatively requirements Seed germination SEED PER FLOWER seed set seedlings segregation self-compatible self-pollination selfed progenies SELFED PROGENIES ALTERNATE showed species Stage II stamens stigma suggesting TABLE temperature thesis University variation varies viable seed weeks