Boreau was born in Saumur, in the department of Maine-et-Loire on March 15, 1803. His father was a laborer, and upon his death he worked at baths established on the quay of the Loire, upstream of the Cessart bridge. Still a boy he came protection of his godfather Abel Aubert Du Petit-Thouars, an admiral. Boreau was able to study humanities at the college of Saumur. From 1820, however he began training to be a pharmacist while working in a dispensary d' Angers. Within the framework of its studies, he enhanced his interest especially in botany, and he enrolled in courses and studied at the Botanical garden d' Angers.
After his marriage to Antoinette Morin, in 1828 he acquired a dispensary in Nevers. The botanist now devotes himself especially to botany and research. He collaborated with Count Jaubert, Minister of Louis Philippe, which, like many of the notable ones of this time, shared a passion for botany. A plant discovered in Central Asia is dedicated to him, the Boreava orientalis.
In 1840, Boreau published the first edition of its Flore du Centre de la France (Flora of the Center of France), a model of precision which becomes a noted reference book at the time (2nd edition in 1849, 3rd in 1857). 4). Alexandre Boreau deployed a great deal of activity at his town botanical garden, reorganizing the classifications and assisting in giving public courses. He published many works, in particular within the framework of the Academic Company of Maine-et-Loire.
Upon his death on May 5, 1875, his widow Antoinette Morin established a herbarium in his memory, later bought by the local government and today deposited in the house of Gaston Allard