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Dallas Chapter

In Memoriam – Marie-Theres Herz

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In Memoriam – Marie-Theres Herz by Cindy Kearney & Alan R. Lusk


Marie-Theres Herz at the 2019 NPSOT Fall Symposium in League City, TX with her herbarium voucher display. (Photo by Alan Lusk)

We are saddened to announce we’ve lost another valuable Dallas member.  On Saturday, January 2nd, Marie-Theres Herz passed peacefully in her sleep.  With great poise and personal strength, she notified our NLCP crew in the summer of 2018 she was diagnosed with ALS (amyotrophic lateral sclerosis), also called Lou Gehrig’s disease.  With great determination and success she focused on her one of her great joys and wonderful legacy – her collection of herbarium vouchers for the North Texas NLCP classes and the NTMN Dallas County Herbarium project.  It was with great honor that we nominated her for the first NPSOT Shirley D. Lusk Memorial Award; an award which honors a citizen scientist for collecting and preserving Texas native plants for public education by providing an outstanding contribution of herbarium vouchers. At the 2019 NPSOT fall symposium, with her family in attendance, Shirley’s son, Alan Lusk, presented her this inaugural award.  Alan said, “Marie-Theres has stepped in where my mother left off mentoring me and teaching me more about the flora of Dallas County and collecting Herbarium specimens.”

L-R, Kristen Pearson, Niculin Herz, Joachim & Marie-Theres Herz and Alan Lusk (Photo by Catherine Lusk)

Marie-Theres served as our chapter’s Vice President and Program Chair from 2013-2014.  She then focused on continuing her volunteering with the NLCP committee and missed only one of the first 30 classes, assisted in the selection of plants for the North Texas program, provided most of the live samples, organized several of the training classes, taught several classes, and scouted and led the plant walks.  Janet D. Smith said, “As administrator of the Dallas NLCP classes, I do a psychological sigh of relief whenever Marie-Theres is with us.  When we take the herbarium vouchers out of the binder and put them on display, the wall gets elevated into an art gallery.”

Marie-Theres Herz with her ‘art gallery’ in an NLCP class. (Photo by Karen Almond)

Marie-Theres describing the characteristics of Blackjack Oak with her voucher during an NLCP class.  (Photo by Cindy Kearney)

In addition to the vouchers being used for NLCP classes, she was a driving force behind the Dallas County Herbarium. The Dallas County Herbarium was established in 2012 by Jim Varnum and the North Texas Chapter of the Texas Master Naturalists. As the mainstay collector for the herbarium, Marie-Theres personally collected and pressed over 800 specimens that are now a part of the Dallas County Herbarium Permanent Collection (312 vouchers), Educational vouchers (268 vouchers) and donation to BRIT (197 vouchers.) She spent countless hours in the field looking for specimens to collect in every corner of Dallas County.


Plant Collecting at Crawford Park in Dallas 4/23/2019; L-R, Dana Wilson, John Wilt, Carolyn Rozier and Marie-Theres Herz (Photo by Alan Lusk)

Marie-Theres was a self-taught botanist who mastered a vast amount of botanical knowledge. She could identify hundreds of plants by memory and was adept at using botanical keys to accurately identify new specimens. She was quick to help verify identification of specimens collected by others. Marie-Theres was a born educator who loved to share her knowledge of native plants with others. She helped teach herbarium volunteers to collect, press and mount plant specimens. She collected additional specimens used in outreach activities of the North Texas Chapter of the Texas Master Naturalists. She organized and led identifying and collecting walks for other Master Naturalists and the general public, adults and children.  She created and presented a program for children to make cards using pressed plants and flowers. Collecting, pressing, and teaching were not her only talents, Marie-Theres, also designed and maintained several of her friend’s residential landscapes and didn’t hesitate to give fellow native plant enthusiasts tours of her gardens and shared plants and seeds from those gardens.  These gardens allowed her to be a prolific provider of plants for our chapter’s fundraising plant sales. We also give her credit with designing our chapter logo.


Portion of Marie-Theres’ personal garden  (Photo by Cindy Kearney)

Carolyn Rozier, North Texas Master Naturalist Herbarium Project Lead, said, “Marie-Theres’ contribution to the botany community, and the Dallas County community in general, has been huge, and her efforts over many years have been an exceptional contribution to our knowledge and understanding of our native plants.”


Trout Lily hike at Spring Creek Forest Preserve 2/15/2020; L-R, Annette Südhof, Astrid Rohlmann, Marie-Theres Herz, Dana Wilson, Nancy Wilson, Catherine Lusk and Alan Lusk (Photo courtesy of Alan Lusk)

Marie-Theres Herz grew up in Switzerland and received her Master of Biology degree from the ETH Zurich in 1977 and her PhD in 1982 from the Univ. of Lausanne. She then conducted postdoctoral research in Cell Biology at the European Molecular Biology Laboratory in Heidelberg (the European equivalent of the Cold Spring Harbor Laboratories) where she met Joachim Herz. Marie-Theres and Joachim were married, and their son was born in 1988. They moved to Dallas in February 1989 when Joachim began work at UT Southwestern Medical Center. After their son graduated from high school, Marie-Theres completed an Associate’s Degree in a Landscape Architecture at Richland Community College where she was introduced to Native Plant Society of Texas (NPSOT). She then pursued her interest in native plants with the same zeal, dedication, and precision that she dedicated to her scientific career, to raising her son, and to every other pursuit and joined NPSOT in Sept. 2009 and became a Certified Master Naturalist in 2010 with North Texas Chapter.


L-R, Nancy Nance, Alan Lusk, Janet D. Smith, Marie-Theres, Cindy Kearney, and Susannah Moore at the 2019 Texas Discovery Gardens’ Native Plant Symposium  (Photo courtesy of Cindy Kearney)
NPSOT members at the Nov. 2014 pot-luck. Back row: Carol Feldman, Don Slossar, Peter Schaar, Marie-Theres, Rick Rosen, Randy Johnson; middle row: Gail Kahle, Sara Beckelman, Betty Priesing, Janet D. Smith, Lee Dixon, Julie Ryan, ?; front row: Carol Cook, Cindy Kearney, Mary Harris, Susan Jones

The family is still planning memorial options and considering a safe one outdoors.  If you’d like to be notified of such a memorial, let us know and we’ll forward.

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