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Introduction to Carex (Sedges) Workshops

March 11 @ 9:00 am - March 12 @ 5:00 pm

Introduction to Carex (Sedges) Workshops
At Cal Poly Humboldt, Arcata, CA.
Two all-day Workshops 9am – 5pm,
Workshop 1: March 11, 2024
Workshop 2: March 12, 2024

Sponsored by The California Native Plant Society, North Coast Chapter and the Cal Poly Humboldt Natural History Museum

Carex is the most speciose genus of flowering plants in California and North America, with over 80 taxa on the North Coast alone. It is also the largest genus of US Army Corps wetland indicator plants in California and the US. As well, there are more rare taxa in the genus than in any other genus in Northern California. Thus, the ability to sight-recognize and efficiently key sedges is critical to conducting wetland delineations, habitat assessments, rare plant surveys, and vegetation typing, as well as designing and implementing habitat restoration and management plans.

With a strong emphasis on Northern California taxa, this workshop offers an intensive immersion into sedge terminology and morphology, and focuses on the identification and ecology of coastal and inland taxa. It begins with a basic review of sedge biology, morphology, and keying terminology. The rest of the workshop will be dissecting and keying specimens using a microscope and the Jepson Manual 2nd. Ed. or Jepson eFlora.

Workshop Objectives
This introductory workshop is suitable for those with beginning to intermediate experience with keying Carex. Principal workshop goals are to 1) increase understanding of common morphological terms used in the Jepson Manual 2nd. ed., the Jepson eFlora, and other floras; 2) demystify challenging or unclear key couplets; 3) review several complexes of similar or closely-related taxa, and; 4) increase familiarity with and improve sight-recognition of many common and rare Northern California taxa.

Cost: $150 for CNPS or Natural History Museum members, or students, and $175 for nonmembers/non-students.

Registration: Register in-person at the CPH Natural History Museum, 1242 G St. Arcata, or online at:

About the Instructor:
Gordon Leppig is a retired Senior Environmental Scientist with the California Department of Fish and Wildlife and has been a student of sedges and wetland plants for over 30 years.


March 11 @ 9:00 am
March 12 @ 5:00 pm
Event Category:
Event Tags:


Cal Poly Humboldt
Arcata, United States + Google Map


North Coast