Provided by the Harvard University Herbarium, ActKey allows visitors to locate and use a key for identifying an unknown specimen. As is noted on the site, "ActKey was developed to enable ready-access to on-line interactive keys. The program is web-based. Common Internet browsers may be used to access the interface." Thus, by visiting the site, users can choose from over five pages of keys, ranging from Aceraceae to Urticaceae. Once at a key, the user is queried for information such as: habit, stems, leaves, stipules, petiole, leaf blade, and more. In the end, you will hopefully have pinned down your specimen to a specific species. Definitely a great site for the recreational botanist, students, and researchers.
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