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Flowers have five fused yellow to orange petals (the corolla) and a green bell-shaped calyx. lagenaria (now Lagenaria siceraria) (both are not Cucurbita but are in the family Cucurbitaceae. Seeds for studying additional species members were not available.Male flowers in Cucurbitaceae generally have five stamens, but in Cucurbita there are only three, and their anthers are joined together so that there appears to be one. Sixteen of the 21 species were grouped into five clusters with the remaining five being classified separately: Many North and Central American species are visited by specialist pollinators in the apid tribe Eucerini, especially the genera Peponapis and Xenoglossa, and these squash bees can be crucial to the flowers producing fruit after pollination. Competitively grown specimens are therefore often hand-pollinated to maximize the number of seeds in the fruit, which increases the fruit size; this pollination requires skilled technique.pepo germinate best with eight hours of sunlight daily and a planting depth of 1.2 centimeters (0.47 in).Seeds planted deeper than 12.5 centimeters (4.9 in) are not likely to germinate. foetidissima, a weedy species, plants younger than 19 days old are not able to sprout from the roots after removing the shoots.By 2012, Iran had moved into the 5th slot, with Egypt falling to 6th.The top 10 countries in terms of metric tons of squashes produced are: In addition to being the 4th largest producer of squashes in the world, the United States is the world's largest importer of squashes, importing 271,614 metric tons in 2011, 95 percent of that from Mexico.Within the United States, the states producing the largest amounts are Florida, New York, California, and North Carolina.
as well as aphids (Aphididae), cucumber beetles (Acalymma vittatum and Diabrotica undecimpunctata howardi), squash bug (Anasa tristis), the squash vine borer (Melittia cucurbitae), and the twospotted spidermite (Tetranychus urticae).Botanists classify the Cucurbita fruit as a pepo, which is a special type of berry derived from an inferior ovary, with a thick outer wall or rind with hypanthium tissue forming an exocarp around the ovary, and a fleshy interior composed of mesocarp and endocarp. Ethylene promotes the production of female flowers.The term "pepo" is used primarily for Cucurbitaceae fruits, where this fruit type is common, but the fruits of Passiflora and Carica are sometimes also pepos. When a plant already has a fruit developing, subsequent female flowers on the plant are less likely to mature, a phenomenon called "first-fruit dominance", Some varieties of C.Most Cucurbita species are herbaceous vines that grow several meters in length and have tendrils, but non-vining "bush" cultivars of C. The female flowers produce the fruit and the male flowers produce pollen. All of these can be treated as winter squash because the full-grown fruits can be stored for months; however, C.Many North and Central American species are visited by specialist bee pollinators, but other insects with more general feeding habits, such as honey bees, also visit. pepo includes some cultivars that are better used only as summer squash.
Cultivated Cucurbita species were derived from the first group.