In 1969, Frank Seymour published The Flora of New England, providing a county-level distribution benchmark for tracheophytes within each state in New England. Species included in the flora were those considered native or naturalized and were largely based on specimens in 16 herbaria Seymour was able to visit. Botanists, taxonomists, and curators from several other herbaria also assisted with collection records, specimen identification, and distribution of species included in his flora. In the absence of a voucher specimen, rarely was a record included solely from a published or unpublished account. Here, we compare New Hampshire county-level invasive species distributions from The Flora of New England (Seymour 1969) with current distributions. In doing so, we benefit from the in-house examination of county-level specimen records Seymour and other experts made compiling the flora in the region's herbaria. Furthermore, the five decades since publication provide a practical amount of time...

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