The name of André Michaux is associated with 742 vascular plant type specimens he collected in North America during the 1790s. While most of these species are widespread and familiar to most botanists, many are uncommon or rare. A selection of 19 rare Michaux plants are included here, with notes on taxonomy, present and past distribution, habitat, rarity status in each state, general population numbers and trends, and threats. The 19 species represent 17 plant families. The species vary from highly restricted endemics to geographically widespread; two of the species are Federally Endangered; nine are Federal Species of Concern. This small selection of plants stands tribute to the remarkable Michaux legacy of frontier exploration and botanical discovery.