Botany in a Day: The Patterns Method of Plant Identification
An Herbal Field Guide to Plant Families of North America
by Thomas J. Elpel
A one-day tutorial introduces eight of the world's most common plant families, applicable to more than 45,000 species of plants.
Garden Resource Center
https://www.growpittsburgh.org/garden-and-farm-resources/garden-resource-center/
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