#gossypium

Cotton and Japanese Accentor by Keinen Imao (1845-1924), included in Keinen Kacho Gafu (Picture Album of Flowers and Birds by Keinen) published in 1891-2

Cottonee

Watercolor

Gossypium (cotton)

Gossypium barbadense is one of the species of cotton grown agriculturally in the modern world where it now grows throughout though it originated in Ecuador and Peru. Left to grow beyond the short cycle it sees in cultivation, this species can turn into a small and slender tree which produces showy but short-lived flowers and later bolls of cotton. Though accounting for around 1/20 of the world’s cotton, the trade names ‘pima’ and ‘Egyptian’ cotton are well-known. Cultivars of G. barbadense are typically Long Staple or Extra Long Staple (I even created and measured staples of this boll’s fiber to check!) which allows them to make fine thread used in high thread count textiles and to create strong cord which has for one thing has been used in auto tires. It is unlikely that this has remained a pure species as it’s been used by humans for longer than 6,000 years and cotton species in proximity can easily interbreed with one another. Some interbreeding was likely deliberate as well, considering for example that the Hawaiian cotton Gossypium tomentosum was bred with commercial species to convey disease and pest resistance. G. barbadense has a noteworthy characteristic in having a single large and prominent extrafloral nectary on the underside of its leaves where it produces a visible (and pretty tasty) bead of nectar. These sorts of nectar sources are not intended to attract pollinators but instead usually draw in insects like ants or wasps which will defend the plant as a food source. While many cotton species have further value for their seed oil, G. barbadense produces too much gossypol, a chemical which in its seeds which renders its oil unsuitable for consumption. Interestingly, gossypol also is known to be an antimalarial compound and has been investigated as a male contraceptive, though in the modern day is only being considered as an alternative to vasectomy.

-Brian

by Pablo Romay Cea