York Botanical Garden. Others are in the Asa Gray Archive at the Harvard University Herbarium. Baldwin's first scientific paper was on two new species of Rottboellia that he had found on the coast of Georgia. It was published in the year of his death. His only other paper was read before a meeting of the American Philosophical Society on April 16, 1819 as he made his way down the Ohio River, but it was not published until 1825. Its subject was two species of Cyperus from Georgia and four Species of Kyllinga from South America. Collections One of the concerns of botany in the early 21st century is the location of type specimens, the material that formed the basis of the description that was given when the plant was named. The whereabouts of this material is sometimes discovered unexpectedly. For example, a set of 18 specimens that Baldwin gave to the American Philosophical Society in March 1819 was neglected, probably because of its small size, and was not studied until 1978. At that time, it was found to contain the type specimens of some species of Rhynchospora. William Baldwin donated generously to the collections of others, often exchanging some of his plants for plants that he desired. He contributed much to the herbaria if Muhlenberg, Elliott, Collins, and Darlington. He also sent specimens to Aylmer Bourke Lambert and Aime Bonpland, and in 1817, he sent some to James Edward Smith. Smith published several new species based on material that Baldwin had sent him. In 1811, he sent moss and lichen specimens to Olof Swartz and Erik Acharius. In 1815, he sent more of the same to Christian Friedrich Schwägrichen. Upon Baldwin's death, his widow wanted to give his herbarium to William Darlington, but Darlington would not accept it because he thought that she should sell it, and he was unable to pay her what it was worth. Zaccheus Collins bought Baldwin's herbarium, but made no scientific use of it. Collins was a Philadelphia merchant who knew as much botany as anyone, but to the exasperation of botanists of his time, chose to create one of the best herbaria in the United States, but published nothing. Collins died without a will in 1831. He had kept the Baldwin herbarium separate from the rest of his collection. The executor of his estate, his son-in-law, sold the Baldwin herbarium to Lewis von Schweinitz