News Release

NSF and NERC award $1.2 Million to botanists to tame the “evil tribe” of ironweeds

Researchers from Texas and the United Kingdom will untangle the classification conundrums of the “ironweed” tribe (Vernonieae) in the sunflower family to advance biodiversity research and conservation

Grant and Award Announcement

Fort Worth Botanic Garden | Botanical Research Institute of Texas

The National Science Foundation (NSF) and Natural Environment Research Council (NERC) have awarded botanists at the Fort Worth Botanic Garden | Botanical Research Institute of Texas (FWBG | BRIT) and Royal Botanical Gardens, Kew $1.2 million (nearly $850,000 from NSF and nearly £300,000 from NERC) to classify and understand plants in a hyper-diverse group referred to as “ironweeds” in the sunflower family, Compositae. This is the first grant of its kind awarded to FWBG | BRIT and Kew through a special international collaborative program between NSF and NERC.

This group of plants forms what plant taxonomists refer to as the Vernonieae tribe and includes approximately 1,500 species of herbs, shrubs, trees and vines worldwide. The “ironweeds” have confounded botanists attempting to understand patterns shared by species in this group, which has led experts to describe tribe Vernonieae by a notorious nickname: the “evil tribe.”

“Vernonieae is incredibly confusing. The characteristics among many species overlap and vary to a degree that it’s hard to differentiate them as distinct genera,” said FWBG | BRIT Research Botanist and Principal Investigator (PI), Morgan Gostel. “At the same time, other plants in the tribe are highly distinctive with little in common and are quite easy to recognize and distinguish at the taxonomic level of genus.”

“For most of the history of Vernonieae, more than one thousand species were classified in the same genus (Vernonia), but Vernonia has been reduced to just 20 species. This has left the remaining species of this once vast genus in a state of limbo or ‘purgatory’ until taxonomists determine their correct placement,” Gostel said.

Recently, considerable research in the Americas has begun to unravel the mysteries of the tribe and species formerly placed in the genus Vernonia; however, nearly half of the species of Vernonieae are restricted to the Eastern Hemisphere and have been long neglected by botanists, said Gostel. Funding from this NSF-NERC award will allow Dr. Gostel and his collaborators at Kew to reclassify diversity in Vernonieae from the Eastern Hemisphere and develop tools to help others identify and understand this enigmatic group of plants. Members of the team at Kew include Drs. Isabel Larridon, Benoit Loeuille and Ana Rita Simões.

Taxonomic knowledge like this is essential to conserving the diversity of plant life on the planet, said Royal Botanic Gardens, Kew Research Leader and co-PI for the grant, Dr. Isabel Larridon. “Understanding the diversity of the nearly half-a-million plant species on Earth is a strategic priority for Kew Science,” Larridon said. “Yet there are too many plant species and not enough trained taxonomists to study, describe and distribute information about them.”

While resolving questions about Vernonieae, Gostel and Larridon will also advance the distribution of scientific information and the training of the next generation of scientists.

The results of their work will be added to the newly established Global Compositae Database (GCD), a public online taxonomic resource for the Compositae family. The GCD, coordinated by the International Compositae Alliance (TICA) is part of a global effort to develop an online database of all plant life and recognized as a Taxonomic Expert Network by the World Flora Online.

At the same time, the team will train the next generation of plant taxonomists by working with at least three graduate students and four undergraduate students. Further international training will be provided through workshops with students, botanists and herbarium and university staff and via environmental education programs offered by FWBG | BRIT and Kew.

During the four-year project, Gostel, Larridon and their team will conduct field work in five countries critical to sampling for this work (the Democratic Republic of the Congo, Madagascar, Mozambique, South Africa and Thailand) and study plant specimens in numerous herbaria around the world, most notably at the Royal Botanic Gardens, Kew (K); Fort Worth Botanic Garden|Botanical Research Institute of Texas (BRIT), Missouri Botanical Garden (MO), Muséum National d’Histoire Naturelle in Paris (P), and Botanic Garden Meise (BR). They will analyze the DNA of Vernonieae and the morphological features such as small hairs, pollen and flowers from these plant species to identify patterns that can help them classify diversity in the group.

“By better understanding Vernonieae, we will be making great strides in understanding the complexity of this group and making important discoveries that will help botanists understand and communicate about plant diversity in other groups,” Gostel said. “We expect the ‘evil tribe’ won’t be so evil when we’re done.”

Editors: Images may be downloaded here.

About the Fort Worth Botanic Garden | Botanical Research Institute of Texas (BRIT®The Fort Worth Botanic Garden (FWBG) is the oldest public botanic garden in Texas with beautiful theme gardens, including the Fuller Garden, Rose Garden, Japanese Garden, and the Victor and Cleyone Tinsley Garden, which features plants native to north central Texas. The Botanical Research Institute of Texas (BRIT®) is a nonprofit, international research, education and conservation organization that collects and safeguards plant specimens, studies and protects living plants, and teaches about the importance of conservation and biodiversity to the world. BRIT assumed nonprofit management of the Fort Worth Botanic Garden Oct. 1, 2020. The combined organization comprises 120 acres in Fort Worth’s Cultural District two miles west of downtown Fort Worth at 3220 Botanic Garden Blvd., Fort Worth, Texas 76107 USA. Summer Hours: Monday-Sunday, 8 a.m. to 6 p.m.  Admission: $12 for adults, $10 for seniors 65+, $6 for children 6-15 and free for those under 5. Parking: Parking is free between the garden center and the BRIT building and in the weekend parking lot (Lot D) during regular business hours. 

About Kew Science at the Royal Botanic Gardens, Kew Kew Science is the driving force behind RBG Kew’s mission to halt biodiversity loss, to uncover the secrets of the natural world, and to preserve the abundance of plants and fungi for the well-being of all life on Earth, as outlined in Kew’s Science Strategy 2021-2025. Home to more than 300 scientists in the UK and working with partners in more than 100 countries globally, Kew has laid out five scientific priorities to aid these goals: innovative research into the protection of biodiversity through Ecosystem Stewardship, understanding the variety of traits in plants and fungi through Trait Diversity and Function, the large-scale digitisation of Kew’s scientific collections through Digital Revolution, using new technologies to speed up the naming and characterising of species through Accelerated Taxonomy, and cultivating new scientific and commercial partnerships in the UK and globally through Enhanced Partnerships. At Wakehurst, Kew’s sister site and ‘living laboratory’, a global collaboration has banked over 2.4 billion seeds of more than 40,000 wild species of plants at the Millennium Seed Bank (MSB), supporting efforts to protect biodiversity from climate change and extinction, while offering an insurance policy for the future of many threatened species. Through its annual State of the World’s Plants and Fungi reports, Kew Science plays an active role in educating the public about the wellbeing of the planet’s biodiversity and the challenges that it faces. The reports set an important international standard, from which scientists can monitor the planet’s health and policymakers can enact change for the better. In 2020, Kew scientists estimated 2 in 5 plants globally are threatened with extinction. The expertise of Kew’s scientists is backed by more than 7 million dried specimens of plants at the historic Herbarium, and more than 1.2 million specimens at the Fungarium, both of which are digitising their collections for invaluable access globally.


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