锦葵科(Malvaceae)棉属(Gossypium)的栽培棉种,大都是一年生品种,但在气候温暖的地带如我国的云南、西康、广西、广东、福建和台湾等地有多年生棉品种的栽培,在这种气候条件下,一年生棉亦能经冬不死,成为多年生状态。多年生棉,不论是海岛棉(G.barba-dense L.)、中国棉(G.arboreum L.)或陆地棉(G.hir-sutum L.),习惯上都称做木棉。后两种在南方虽可变为多年生,但不重要,所以木棉一般指多年生海岛棉而言。此外,我国南部如云南、广西、广东和贵州等地有 Malvaceae (Gossypium) cultivation of Gossypium are mostly annual varieties of cotton, but in warm climates such as China’s Yunnan, Xikang, Guangxi, Guangdong, Fujian and Taiwan, there are many years of cotton cultivation, Under such climatic conditions, annual cotton can also die in winter and become perennial. Perennial cotton, either G. barba-dense L., G. arboreum L. or G. hir-sutum L., is customarily called kapok. Although the latter two can become perennial in the south, it is not important, so kapok generally refers to perennial island cotton. In addition, southern parts of our country such as Yunnan, Guangxi, Guangdong and Guizhou are present