_G. mustelinum_ again “is only interesting for botanical reasons,” but is found wild in the hilly interior of Brazil; _G. punctatum_ is said to be identical with the wild cotton of the United States; _G. hirsutum_ is a true native of South America and the West Indies, and is the lineal parent of the “Uplands” cottons of North America. _G. mexicanum_ is, together with _hirsutum_, which it resembles, grown all over the coastal cotton country of Brazil; it is a small plant with a prolific yield. The writer has seen in the vicinity of Campos, State of Rio, tiny plants of this variety not more than eighteen or twenty inches high, bearing forty and more bolls and forms. It is true that the district had suffered from lack of rain and thus the tendency to run to growth rather than production, the agricultural curse of the tropics, had been checked. The field yielded over a bale to the acre. _G. peruvianum_ is a highly interesting, hardy, prolific variety, relative of the best native cottons of Brazil. Professor Edward Green says that he considers it one of the two most valuable in the country. It is a perennial, grows best in the humid North, often reaches a height of four metres, and yields a crop for at least three years.[13] Maranhão has produced it for centuries, getting a reputation for long fine fibres on its account; the percentage of fibre is over thirty-eight per cent of the total weight of the boll, a very high average, and it is undoubtedly well adapted to the river valleys of North Brazil. It is said to be identified with the carefully cultivated, irrigated cotton of the Incas. Cultivated forms of this excellent cotton are the famous _Mocó_, grown so successfully in Ceará, Parahyba, and other northerly states, the _Seridó_, and the _Sede de Ceará_, local names of which Brazil is proud.