Welcome to the North Tract Plant Inventory Project


Neil Hotchkiss

Flora of the Patuxent Research Refuge - 1940

Flora of the Patuxent Research Refuge – 1940













Plant collection is not new to the Patuxent Research Refuge. Neil Hotchkiss and Robert Stewart conducted a preliminary survey between 1936 and 1946. In 1940, Hotchkiss published the Flora of the Patuxent Research Refuge, Maryland.


Robert E. Stewart

In July 1947, Hotchkiss and Stewart published the results of their survey in “The American Midland Naturalist” in an article titled Vegetation of the Patuxent Refuge, Maryland.

At the time, the refuge consisted of some 4000 acres in what is now called the “Central and the South Tracts.”



Fran Uhler



Plants were collected and placed into the refuge’s herbarium. Many scientists contributed their specimens to the herbarium, with Neil Hotchkiss and Fran Uhler contributing the most number.

Bill Stickel

Bill Standing by North Tract Main Entrance Sign

Bill Standing by North Tract Main Entrance Sign


Chang-tzu Lew Standing by Herbarium Cabinet







In 1979, William Stickel published an addendum to the 1947 list in a booklet called “Vegetation and vertebrates of the Patuxent Wildlife Research Center: outline of ecology and annotated lists.” This publication added several species of plants new to the refuge. The herbarium was put into a caretaker status and was maintained herbarium by Matt Perry of the USGS until about 2010.

During the summer of 2010, I started photographing plants on the North Tract just for the fun of it. By the fall, I had gotten to know the staff on the North Tract fairly well. The staff told me that I could take photos of more habitats if I obtained a Special Use Permit (SUP). In the meantime, I found out about the old herbarium cabinet on the Central Tract. After talking with Matt Perry and others, I then got the idea of cataloging the plants on the North Tract since that had never been done in a systematic way.

I finally got the SUP on 1 November 2010, and I have been busy since then collecting and photographing the plants on the North Tract. After going through the original Patuxent lists, I discovered that there were numerous nomenclature issues. So, I got the idea of making a master list for the whole refuge.

This will likely be a several-year project before I draw up a final product covering the whole refuge. In the meantime, I will make a list of the ones collected on the North Tract first and go from there.

As of June 2020, the herbarium contains over 5,300 specimens including over 3,200 specimens collected since 2010. We have identified almost 1000 species, including over 200 new records for the refuge and five species new to Maryland. The total tally for the whole refuge, which includes the original Patuxent list, is over 1250 species. We are now comparing the plants we have collected on the North Tract with those which we collected by Niel Hotchkiss, et al. In April 2015, we added a second herbarium cabinet to accommodate the additional specimens, and are planning to add a third cabinet soon.

The refuge has been very supportive so far. They have given me volunteers to help with mounting and herbarium maintenance, and will be advertising for an intern to help within the next year.

Believe it or not this is not my vocation. I have a BS degree in botany, but my career took a different direction. However, over the years, I have tried to keep up my interest in botany. I do not consider myself to be fully competent with the local flora, but I am learning. I am actually more familiar with the flora in my hometown Spokane Washington than I am with the plants around here, but that was over 40 years ago. I appreciate your offers of assistance.

Bill Harms

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  1. Pingback: Discovering Patuxent’s North Tract | Welcome to Greenbelt, MD

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