He studied law in Montpellier, during which time, he developed a passion for botany. He was a friend and collaborator to Scipio Maffei, with whom he took an extended scientific tour throughout Europe (1732–36).[1] In 1755 he became a member of the Académie de Nîmes, serving as its secrétaire perpétuel from 1765 to 1784. In 1772 he became a member of the Académie royale des Inscriptions et Belles-Lettres.[2]
His written works include a detailed description of the flora in the vicinity of Verona, titled Plantae Veronenses, seu Stirpium quae in agro Veronensi repriuntur (3 volumes 1745–54).[8] Other noted works associated with Séguier are:
Bibliotheca botanica, sive, Catalogus auctorum et librorum omnium qui de re botanica, de medicamentis ex vegetabilibus paratis, de re rustica, & de horticultura tractant, 1740. Séguier's Bibliotheca botanica includes Ovidio Montalbani's Bibliotheca botanica as an appendix.
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