Contains descriptions of the representatives of the families Solanaceae and Scrophulariaceae. The former includes 45 numbered and 21 unnumbered species, while the latter includes 602 numbered and only 6 unnumbered species. Brief information on the potato, tomato, pepper, and other economically very important plants of the family Solanaceae, and some representative plants of both families, i.e. are weeds harmful to field and vegetable crops, are given in this book.