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The flowering habit and sex expression for 36 native bottle gourds (Lagenaria siceraria Standl.) collected from around the country, differing from fruit shape, were investigated. The blooming time of male or female flowers was all around eight to nine o´clock at night and optimum temperature for flowering was 2025℃. Days to flowering of the first female flowers after sowing was approximately 73 days, but ´Andong´, ´Danyang´ and ´Ulreung´ needed 60 days while ´Jeju 1´, ´Naju´ and ´Taean´ were required over 80 days. Female flower did not bear on the main vine, but instead was produced at the secondary and tertiary vines only. According to the bearing habits of the pistillate flowers, the Korean native bottle gourds can be divided into six groups.
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