The Memoirs of the Torrey Botanical Society are published at irregular intervals in volumes of various sizes when a feature subject or a special collation of topics arises. The peer-reviewed Memoirs comprise a series of longer botanical papers (over 50 printed pages long) and monographs that began in 1889; to date, 68 issues have been published in 27 volumes. Early issues of the Memoirs often were dedicated to taxonomic monographs and revisions by a single author, but more recent issues usually have presented discussions of topics by a collaboration of authors.
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