An amateur? Is that any way to talk about a scientist?

Jane Colden, An amateur? I don't think so.
"However, amateurs also made important contributions to the study of American botanicals, examining the plants in local areas, presenting their findings at botanical societies, swapping samples with other botanists and sending plants back to Europe, and cultivating herbaria and arboreta. From colonial times until the mid-nineteenth century, the work of amateurs in finding, studying, and documenting new species was important to the study of botany as a whole. A primary example is Jane Colden (1724–1766), the daughter of the botanist Cadwallader Colden. Tutored only by her father, Jane Colden studied and drew the plants of New York, classifying hundreds of plants, including the gardenia, which she discovered.

"Jane Colden was especially renowned for understanding and using the Linnaean classification scheme. Carl Linnaeus (1707–1778), a Swedish doctor and botanist, developed his hierarchy throughout his life, his most notable publications including the Systema Naturae (1735), GeneraPlantarum (1737), and Species Plantarum (1753). The Linnaean system, which has since been greatly revised, divided animals and plants into kingdoms, classes, orders, genera, and species, all written in Latin. Each species was given a two-part (binomial) name of genus and species." Source: http://www.answers.com/topic/botany.