Cucurbita

Lore & Background

Cucurbita species are herbaceous vines that grow several meters in length, with tendrils for climbing. The yellow or orange flowers are unisexual, with male and female flowers on the same plant.

Female flowers produce the fruit, while male flowers produce pollen. Many North and Central American species are visited by specialist bee pollinators, though honey bees also visit. The fruits are large and fleshy, classified botanically as a pepo, with seeds attached to the ovary wall.

Reader's Guide

Cucurbita species are significant as a source of nutrients such as vitamin A and vitamin C, and are cultivated worldwide for culinary uses including pumpkin pie, biscuits, bread, desserts, puddings, beverages, and soups. Although botanical fruits, they are typically cooked and eaten as vegetables. The taxonomy of the genus is debated, with accepted species numbers ranging from 13 to 30. The five domesticated species—C. argyrosperma, C. ficifolia, C. maxima, C. moschata, and C. pepo—can all be treated as winter squash, though C. pepo includes some cultivars used as summer squash.

The morphological variation within species like C. pepo and C. maxima is so vast that subspecies and cultivars have been misidentified as separate species. Reproductive biology involves specialist squash bees (genera Peponapis and Xenoglossa) and the effect of pollen quantity on seed number and fruit size, known as xenia. The plant hormones ethylene and auxin are key in fruit set and development, with ethylene promoting female flowers.

Did You Know?

• The genus name Cucurbita is Latin for 'gourd'.