Leo H. Grindon, Country Rambles, and Manchester Walks and Wild Flowers
“ For plants, like animals, have sex, and though in most cases male and female co–exist in the same flower, it happens with some, especially with the timber–trees of northern latitudes, that the flowers are of only one sex, some of them being male and others female. Occasionally the entire tree is male only or female only—the condition of the willow and the poplar, the yellow flowers of the former of which are the male, and the greenish [17] ones the female. ”
