Sue Janssen

Joined: Jun 25, 2018 Last Active: Jul 15, 2024 iNaturalist

Retired rocket scientist who is being retrained in botany. Resident of Colorado. Volunteer at Denver Botanic Gardens Katherine Kalmbach Herbarium. I enjoy fieldwork and the challenge of plant ID. I am not an expert - I'm just lucky to be mentored by experts.

My primary source for plant ID is "Flora of Colorado" by Jennifer Ackerfield. I am now (Dec 2022) using her Second Edition which has many taxonomy updates. Southwest Colorado Wildflowers is an amazing resource ( My "go-to" key for alpine plants is "Alpine Flower Finder" by Janet Wingate & Loraine Yeatts (but be aware this is OLD taxonomy). I frequently consult SEINET ( and USDA Plants ( for location information. Taxonomy is very difficult for me - so many synonyms! I refer to POWO ( and GBIF ( for accepted names.

I generally limit my identifications to Colorado. It is fine to @ me, but I may not be familiar with flora of other states or countries and decline to suggest an ID.

My husband and I have been scuba diving for 35 years in the Caribbean and Pacific. Underwater photography has made us better divers. I am starting to post some of my photos and could use help with IDs.

My favorite iNat camera is the Olympus Tough (TG-5 or 6). It has an amazing microscope mode. I also use this camera for underwater photography (in a housing with strobe).

It is my wish that all of the content I have contributed to iNaturalist (photos, comments, etc.) remain on the site in the event of my death.

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