Museum of Northern Arizona exterior

Herbarium: A look at a new environment

Mentzelia memorabilis
Mentzelia memorabilis

Published on Sept 10, 2018 in the Arizona Daily Sun

Drawers of corn in many colors and stacks of pungent juniper – the Walter B. McDougall Herbarium is a dried garden holding important knowledge for researchers seeking to understand a changing environment.

“Basically you’re documenting biodiversity,” said Kirstin Phillips, MNA Botany Collections Manager. “That plant at that place at that time.”

The herbarium began in August 1928, when Dr. Harold Colton donated a “nucleus collection of flowers for the herbarium.” There’s no indication whether the flowers were already pressed flat or brought as a fresh-picked bouquet. Either way, the small collection has grown through the years to more than 40,000 specimens.

Most valuable, many of the specimens come with ethnobotanical notes about their traditional names and uses, from absorbent bark used to pad cradleboards to leaves purportedly used as poisons. Sometimes plants are also stored as they would have been in an ancient pantry, such as the cantaloupe melon, which is dried in strips and wrapped around itself in an early version of a fruit rollup.

The herbarium contains the collections of many early ethnobotanists, including Al Whiting, Grenville Goodwin, and Louisa Wetherill. Wetherill spoke Navajo and would go on walks with a Navajo traditional healer, Wolfkiller. On their walks they collected plants and Wolfkiller would tell Wetherill their uses.

For the past few years Phillips has been processing the backlogged herbarium specimens through a grant from the Institute of Museum and Library Services. As she matches historic plant specimens to their ethnobotanical notes, Phillips discovers new plants and fascinating tales.

One of these was a plant originally collected by Museum of Northern Arizona researchers in 1979. At the time, the researchers recognized it was in the Mentzelia genus, but did not know what species it was. Recently Phillips identified the specimen as Mentzelia memorabilis, a species unknown to science when it was found in 1979. The species was not named until 2002, after other researchers discovered it when they found themselves stuck in Salt Lake City after the 9/11 terrorist attack.

While stuck in Salt Lake City, Noel Holmgren and Patricia Holmgren discovered specimens of an unnamed species of Mentzelia in the Stanley L. Welsh Herbarium at Brigham Young University that looked different. They decided to visit the place where the plants were collected—a small area on the Arizona strip and just beyond across the Arizona-Utah border. This is the only place this plant occurs and it is considered critically imperiled.

The Holmgrens decided the species was distinct and named it Mentzelia memorabilis, or the 9/11 blazingstar. As they wrote in the paper describing the new species, “We admit we did not enjoy our usual elated frame of mind when we discover something new, but somehow the lovely yellow flowers of the blazingstar, rising from the stark, barren clay Arizona hills, spoke to us of brightness and hope in this otherwise shattering time. To us, their reoccurring beauty in a bleak landscape symbolized the beauty and resiliency of the human spirit. We have named this species in memory of those who lost their lives in the terrorist attack of September 11, and in tribute to the many heroes of that day and in those days following.”

MNA researchers continue adding to the herbarium, from plants Dr. Larry Stevens finds growing near the remote springs he studies to galls Dr. Gary Alpert collects as he investigates arthropods. With the advent of affordable DNA sequencing, this growing repository of plant diversity will continue to produce new and valuable information. It may also someday be the seed for a new garden of old varieties.

“There’s an opportunity for saving extinct plants by going back to the herbarium sheets and using seeds,” said Phillips.

Phillips will lead a Behind-the-Scenes Botany tour of the herbarium on October 19. Space is limited. Go to for details and tickets.