San Juan County WSU Master Gardener Foundation's presentation of:   

Plant Family Morphology and Identification
David Giblin, PhD, Collections Manager and Research Botanist  for the University of Washington Herbarium
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This was an excellent refresher worth 4 hours of continuing education, that included an introduction to plant morphology, common plant families, and how to use a dichotomous Identification key.

Access Recordings here:

Basic Vascular Plant Morphology: Part 1 Vegetative Parts

Introductions to Ten Common Families and a Basic Key for 29 Families