Abstract
The primrose plants began to flower 161 days after sowing from the 13th node onwards with a flowering duration of 64 days. The flowers are axillary, solitary and bisexual. Flower development took eleven days from the visible stage of bud initiation to the full bloom stage. The length and diameter of the fully developed flower bud were 6.0 cm and 0.69 cm, respectively. Anthesis occurred between 6.0 p.m. and 11 p.m. and its peak period was at 10 p.m. Anther dehiscence was prior to anthesis, it was between 6 a.m. and 12 noon with a peak at 9 a.m. The pollen grain size was 173.47 µm. The stigma was receptive on the day (100%) and one day before (92%) anthesis.
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