Author Archives: Grace Davenport

Plants of medicine, myth and modernity

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Plants shape our historical and modern worlds

For many of us in the modern age, plants blend into the background. The joy of this internship, and other outdoor work, is the movement of plants to centerstage again as primary shapers of the world. Not long ago in Europe and much more recently in North America, plants were the primary suppliers of medicine and raw materials. Here in and around the Flathead National Forest, plants were imperative for everyday life of the Salish and Kootenai people. An exhaustive list of plants and their traditional uses is not possible here, but important edible plants included Serviceberry, Huckleberry, and Camas (Bear Don’t Walk, 2019). Plants for raw materials included Apocynum cannabinum for rope, Salix (willow) for fish traps, and Holodiscus discolor (oceanspray) for digging stick handles (Ryan, 2024). In the paragraphs to follow, I focus on three medicinal plants, common and widespread across multiple continents, that many cultures used and still use today. The independent use of these plants for similar ailments across different cultures corroborates their effectiveness.  The application of these plants goes back thousands of years, with the origin of their medicinal value shrouded in myth and legend but their effectiveness indisputable and tangible with the modern-day scientific isolation of their bioactive compounds.

The view from Doris Mtn, looking west across the Flathead valley

Yarrow: ancient medical hero

Yarrow, the common name for various plant species in the Achillea genus, is widespread throughout Eurasia and North America. Species of Achillea have been used for thousands of years in the treatment of wounds, infections, inflammation and skin conditions (Applequist & Moerman, 2011). Yarrow pollen was unearthed at the 65,000-year-old burial site of several Homo neanderthalensis in a cave near Shanidar, Iran (Applequist & Moerman, 2011). The genus name, Achillea, honors the ancient Greek mythological hero Achilles. Achilles was not just a famed (nearly invincible) warrior; he was also trained in the arts of medicine by his tutor, Chiron the Centaur. The ancient Greeks believed Achilles discovered the astringent properties of Yarrow and carried it with his army to stem bleeding wounds (Chandler et al.,1982). In addition to wound healing, the Salish boiled leaves and stems of Achillea millefolium for colds and made a compress out of the leaves for toothaches (Hart,1979).

Modern-day chemical analysis and assays of the bioactive compounds in Achillea reinforce traditional medicinal uses. Sesquiterpenes isolated from yarrow display anti-inflammatory properties through inhibition of COX-2, an enzyme involved in inflammation and pain (Applequist & Moerman, 2001; Benedek & Kopp, 2007). Extracts of four Achillea species, including the Achillea millefolium species found in the Flathead National Forest, showed a broad spectrum of antimicrobial activity against seven different strains of pathogenic bacteria and fungi (Saeidnia et al., 2011). The aromatic, delicately feathered leaves and cloud-like flower heads of yarrow contain compounds for a familiar and ever-present need: wound-healing.

Yarrow, Achillea millefolium, in flower

St. John’s Wort: revered and reviled

St. John’s Wort, Hypericum perforatum, is native to Eurasia and North Africa, but is now so common in North America it is often considered a noxious weed. The showy, yellow flowers and glandular leaves contain numerous bioactive compounds that are harmful to grazing animals but prove useful for human medicine. St. John’s Wort was used in traditional Chinese, Greek, and Islamic medicine for depression, anxiety, nerve pain, wounds, infections, and inflammation (Barnes et al., 2001). The scientific genus name, Hypericum, is ancient Greek for “above” (hyper) and “picture” (eikon). “Above picture” refers to the tradition of hanging the revered and powerful plant over religious icons (Barnes et al., 2001). The common name, St. John’s Wort, originates from the practice of harvesting the plant during the Midsummer festival, later Chirstinaized as St. John’s Feast Day. Harvesting the flowers at such an auspicious time was believed to make the herb’s healing and magical powers even more potent (Trickey-Bapty, 2001). On the festival day, St. John’s Wort was hung over doorways to ward off evil spirits. This practice inspired another common name: “fuge daemonum” (demon-flight).

Fields of the tall yellow flowers, which excrete a rusty red compound when crushed, are a familiar site along disturbed roads, old logging sites, and burns here on the Flathead National Forest. The plant’s bioactive compounds give it both medicinal properties and also invasive advantages, since the plant engages in allelopathy and releases chemicals into the surrounding soil that inhibit other species’ germination and growth (Aziz, 2006). Chemical analysis reveals two significant bioactive compounds, hypericin and hyperforin, that support several of the traditional uses of St. John’s Wort (Barnes et al., 2001). Hyperforin appears to inhibit serotonin uptake, analogous to conventional selective serotonin reuptake inhibitors (SSRIs), as well as inhibit the uptake of other neurotransmitters like dopamine and norepinephrine (Barnes. 2001). These antidepressant activities are substantiated in randomized controlled studies where the herb is more effective than a placebo and as effective as several conventional antidepressants in mild-to-moderate depression (Barnes, 2001). Hyperforin shows significant antimicrobial and antifungal effects as well as increased collagen synthesis which expediates wound healing (Nobakht, 2022).

St John’s Wort, the plant of demon-flight

A family of pungent herbs: the Mints

One of the oldest surviving medical texts in the world, the ancient Egyptian Ebers Papyrus from 1550 BC, recommends mint for stomach pain and flatulence (Pickering, 2020). The Salish and Kootenai as well as the Blackfeet used a local mint family member, Monarda fistulosa (Beebalm), for stomach pain, toothaches, colds, and fevers (Anderson; Hart 1979). Monarda fistulosa contains thymol, a strong antiseptic, with a cooling, strong flavor and odor that is popular today in mouthwashes and toothpaste (Lawson et al., 2021). The Salish rubbed Monarda fistulosa on the body for a mosquito repellant and sprinkled dried leaves on meat and berries to repel flies and preserve food (Bear Don’t Walk, 2009). The antimicrobial activity of the plant is attributed to terpenoids that slow the growth of certain pathogenic bacteria, like Streptococcus aureus (Anwar et al., 2019). Members of the mint family include an array of herbs such as beebalm, self-heal, horsemint and thyme that caught the attention of people as possessing the revered ability to heal.

Monarda fistulosa (beebalm)
Agastache urticifolia (horsemint)
Prunella vulgaris (self-heal)

Many cultures throughout the ancient and indigenous world recognized the medicinal properties of Yarrow, St. John’s Wort, and mint. The long-standing importance of these plants in the human story explains their persistence as daily shapers of our world today.

References

Anderson, M. Kat. “Wild Bergamot.” United States Department of Agriculture. https://plants.usda.gov/DocumentLibrary/plantguide/pdf/pg_mofi.pdf

Anwar F, Abbas A, Mehmood T, Gilani A-H, Rehman N. Mentha: A genus rich in vital nutra-pharmaceuticals—A review. Phytotherapy Research. 2019; 33, 2548–2570. https://doi.org/10.1002/ptr.6423

Applequist, W.L., Moerman, D.E. Yarrow (Achillea millefolium L.): A Neglected Panacea? A Review of Ethnobotany, Bioactivity, and Biomedical Research1 . Economic Botany 65, 209–225 (2011). https://doi.org/10.1007/s12231-011-9154-3

Azizi, M. and Fuji, Y. (2006). ALLELOPATHIC EFFECT OF SOME MEDICINAL PLANT SUBSTANCES ON SEED GERMINATION OF AMARANTHUS RETROFLEXUS AND PORTULACA OLERACEAE. Acta Hortic. 699, 61-68 DOI: 10.17660/ActaHortic.2006.699.5 https://doi.org/10.17660/ActaHortic.2006.699.5

Barnes, J., Anderson, L.A. and Phillipson, J.D. (2001), St John’s wort (Hypericum perforatum L.): a review of its chemistry, pharmacology and clinical properties. Journal of Pharmacy and Pharmacology, 53: 583-600. https://doi.org/10.1211/0022357011775910

Bear Don’t Walk, Mitchell Rose, “Recovering our Roots: The Importance of Salish Ethnobotanical Knowledge and Traditional Food Systems to Community Wellbeing on the Flathead Indian Reservation in Montana.” (2019). Graduate Student Theses, Dissertations, & Professional Papers. 11494. https://scholarworks.umt.edu/etd/11494

Benedek, B., Kopp, B. Achillea millefolium L. s.l. revisited: Recent findings confirm the traditional use. Wien Med Wochenschr 157, 312–314 (2007). https://doi.org/10.1007/s10354-007-0431-9

Chandler, R.F., Hooper, S.N. & Harvey, M.J. Ethnobotany and phytochemistry of yarrow, Achillea millefolium, compositae. Econ Bot 36, 203–223 (1982). https://doi.org/10.1007/BF02858720

Hart, Jeffrey A. “The ethnobotany of the Flathead Indians of Western Montana.” Botanical Museum Leaflets, Harvard University 27.10 (1979): 261-307.

Lawson SK, Satyal P, Setzer WN. The Volatile Phytochemistry of Monarda Species Growing in South Alabama. Plants. 2021; 10(3):482. https://doi.org/10.3390/plants10030482

Nobakht SZ, Akaberi M, Mohammadpour AH, Tafazoli Moghadam A, Emami SA. Hypericum perforatum: Traditional uses, clinical trials, and drug interactions. Iran J Basic Med Sci. 2022 Sep;25(9):1045-1058. doi: 10.22038/IJBMS.2022.65112.14338. PMID: 36246064; PMCID: PMC9526892.

Pickering, Victoria. “Plant of the Month: Mint.” JSTOR Daily, 1 April 2020, https://daily.jstor.org/plant-of-the-month-mint/.

Ryan, Tim. “Ethnobotany of the Confederated Salish & Kootenai Tribes.” Montana Native Plant Society Annual Meeting, 28 June 2024, Camp Utmost, Greenough MT. Lecture.

Saeidnia S, Gohari A, Mokhber-Dezfuli N, Kiuchi F. A review on phytochemistry and medicinal properties of the genus Achillea. Daru. 2011;19(3):173-86. PMID: 22615655; PMCID: PMC3232110.

Trickey-Bapty C (2001). Martyrs and miracles. New York: Testament Books. p. 132. ISBN 9780517164037.

A spectrum of relationships in the human and ecological community: mutualism to parasitism

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Moving: frequently underestimated

Moving always comes with unexpected problems. After living in Missoula, MT for the last two years, I moved up to Kalispell for this internship. I uprooted quite an extensive system of familiarity, but there are some connections that withstand the uprooting and room is made for new ones. I have had to regroup and reassess what relationships sustain me, and what resources and opportunities to pursue. The relationships built in human and ecological communities can both sustain and harm the player/actor and it is impossible in either world to live outside the web of connections. My co-intern and I have seen and learned a lot since we started a month ago, and below I share some stories of plants we encountered in their interconnected ecological webs, and the unusual and unique ways of life they devise to survive in their communities.  

Tally Lake (the second deepest lake in Montana) is east of Kalispell.

Busy bees and toxic pollen

Flowering plants can develop intimate relationships with their pollinators, like the bumble bee. Some plants require a physical vibration to release pollen held tightly to their anthers, and bumble bees, unlike honeybees, can perform the essential “buzz pollination” that can shake this pollen loose (Dolan et al. 2021). Montana is a uniquely diverse state for bumble bees, with 28 species documented in Montana out of the 45 total found in North America (north of Mexico). This month we participated in the Montana Bumble Bee Atlas project, a community science project gathering data for tracking and conserving bumble bees (Bumble Bee Atlas). We traveled up the gravel road running alongside the North Fork of the Kalispell River (west of Glacier Park) to reach meadows of lupine and buckwheat flowers. The catch-and-release survey we conducted was a small data point in this comprehensive project aimed at sampling hundreds of locations across Montana.

Capture-and-release bumble bee surveys!
North Fork of the Flathead River

Some plants may require buzz pollination, but at least there are several different species of bumble bees to do the job. The Mountain death camas, Zigadenus elegans, has only one pollinator: the miner bee. The death camas is flowering right now, and the plant’s cream-colored flowers, dotted with green nectaries, look inviting. True to its name, however, the entire plant is toxic. Everything from the bulbs to the nectar and pollen contain the deadly neurotoxin zygacene. All pollinators but the miner bee, Andrena astragali, would drop dead if they tasted from this flower. A single bulb is enough to kill a human. Why would a plant kill all but one of its pollinators? The answer lies in the usefulness of the toxin to the miner bee. The kleptoparasitic cuckoo bee lays its eggs next to the miner bee eggs, expecting a meal from the food cache the miner bee left for its own young. Once hatched, the cuckoo bee eats the toxic food cache, laced with zygacene poison from the death camas plant. Only the miner bee has an innate immunity, so the kleptoparasite dies, ridding the miner beehive of the pest. In return, the mountain death-camas gains a loyal, mutually codependent pollinator (Mitton 2022).

The beautiful but deadly Zigadenus elegans

The making of a unique community: the fen and friends

Many of the rare plants we are searching for are encountered in wetlands, particularly fens. A fen is characterized by the presence of peat (sphagnum moss), a pH greater than 6 (neutral to basic), and a year-round supply of mineral-rich groundwater (Keddy 2010). The groundwater chemistry of a fen system determines the fen’s pH, with more basic fens considered “rich” in terms of species richness and more acidic fens considered “poor” (Wassen et al. 1996). Rich fens are often fed by groundwater running through limestone, which produces a bicarbonate buffer against acidity.

We surveyed a rich fen and a poor fen this month. The rich fen was a checkerboard of little microclimates, each inhabited by distinct species carving out little niches. We saw the rare orchid Liparis loeselii, a picky plant, that requires the convergence of many conditions: mossy tussocks to create microtopography, open vegetation, calcareous waters, and specific mycorrhizal fungi associations (Maris et al. 2023). Mycorrhizal associations are of particular importance to orchids. The dust-like seeds of orchids lack energy reserves for the embryo to germinate (Jacquemyn et al. 2017). During orchid germination, mycorrhizae send out hyphae that penetrate the cell wall and feed carbohydrates and nutrients to the tiny orchid. Without this intervention, the orchid lacks the fundamental building blocks to continue development. Different studies have shown the specificity of these associations, revealing the Liparis loeselii preference for a specific saprotrophic fungi in the Tulasnellaceae genus (Maris et al. 2023).

The elusive Liparis loeselii

We also surveyed a poor fen composed predominantly of sphagnum (peat) mosses. The sphagnum mosses acidify and lower the nutrient availability of fens. Both the rich and poor fen contained Drosera rotundifolia, a sundew, but the poor fen contained larger patches. Sundew associate with sphagnum moss, which create floating mossy tussocks of desirable sundew habitat. The high-water table of a fen creates unique challenges for plant species, since nutrients from the soil are not easily attained. Sundew supplements its nitrogen needs by carnivalizing insects (Millett et al. 2012). The plants attract insects with a sugary, sticky mucus that coats the end of many little red stalks on their leaves. Once prey makes contact, the plant can move its tentacle-like leaves, a response called thigmonasty, to place the insect in contact with as many stalks as possible. The plant secretes digestive enzymes that dissolve the insect, and the leaf surface absorbs the nutrient-rich ex-insect soup.

Drosera rotundifolia in association with sphagnum moss
A poor fen composed of more sphagnum moss than a rich fen

Turning tables: myco-heterotrophic and parasitic plants

Almost all orchids are myco-heterotrophic at some point in their lifecycle and with maturity they produce chlorophyll and begin making food of their own. Some orchid species, like those in the Corallorhiza genus, never “grow up” and they remain fully to partially myco-heterotrophic throughout their lifespan. Myco-heterotrophy are reversed plant-mycorrhiza relationships, where carbon exchange goes from fungus to plant (Trudell et al. 2003). These plants are sometimes referred to as “mycorrhizal cheaters.” Lying in the subterranean darkness for most of their lives, these plants mimic their mushroom host’s life cycle, popping up from the ground only to produce a reproductive structure (Zimmer et al. 2008).

Corallorhiza trifida, or yellow coral root, contains some chlorophyll and is only partially myco-heterotrophic

While Corallorhiza and other myco-heterotrophic orchids parasitize fungi, the plant species of the Broomrape family (Orobancheae) parasitize other plants. The seeds of Orobanche uniflora stay in the soil for years, lying in wait until certain chemicals released from nearby plant hosts stimulate germination. The seedlings put out haustoria, rootlike structures, which delve into nearby host root tissue, siphoning off water and nutrients (Kokla & Melnyk 2018). The Latin work “haustor” translates to “the one who drains” and these little vampiric plants have an apt common name: cancer root.

Orobanche uniflora, or cancer root, is completely dependent on its plant hosts for food and water

References

Dolan, Amelia., et al. “Bumble Bees in Montana.” MSU Extension, Aug. 2021, https://apps.msuextension.org/montguide/guide.html?sku=MT201611AG

Jacquemyn H, Waud M, Brys R, Lallemand F, Courty P-E, Robionek A and Selosse M-A (2017) Mycorrhizal Associations and Trophic Modes in Coexisting Orchids: An Ecological Continuum between Auto- and Mixotrophy. Front. Plant Sci. 8:1497. doi: 10.3389/fpls.2017.01497

Keddy, Paul A. (2010). Wetland ecology: principles and conservation (2nd ed.). Cambridge: Cambridge University Press. ISBN 978-1-139-22365-2. OCLC 801405617

Kokla A., Melnyk C. W. (2018). Developing a thief: Haustoria formation in parasitic plants. Developmental Biology, 442 (1) (2018), pp. 53-59, 10.1016/j.ydbio.2018.06.013

Maris, Louise & Petrolli, Rémi & Selosse, Marc & Legland, Thomas & Pache, Gilles & Griveau, Chantal & Torre, Franck & Lopez-Pinot, Dominique & Marciau, Roger & Bonnet, Véronique. (2023). Impact of the local environmental factors associated to plant-fungi communities on the conservation of Liparis loeselii (L.) Rich. In the French Rhône-Alpes region. Acta Oecologica. 120. 10.1016/j.actao.2023.103929.

Millett, J.; Svensson, B. M.; Newton, J.; Rydin, H. (July 2012). “Reliance on prey-derived nitrogen by the carnivorous plant Drosera rotundifolia decreases with increasing nitrogen deposition”. New Phytologist. 195 (1): 182–188. doi:10.1111/j.1469-8137.2012.04139.x. PMID 22506640

Mitton, Jeff. “A Rare Relationship between Death Camas and Death Camas Miner Bees.” Colorado Arts and Sciences Magazine, 1 Apr. 2022, www.colorado.edu/asmagazine/2022/04/01/rare-relationship-between-death-camas-and-death-camas-miner-bees.

Trudell, SA; Rygiewicz, PT; Edmonds, RL (2003). “Nitrogen and carbon stable isotope abundances support the myco-heterotrophic nature and host-specificity of certain achlorophyllous plants” (PDF). New Phytologist. 160 (2): 391–401. doi:10.1046/j.1469-8137.2003.00876.x. PMID 33832180.

Wassen, M.J., van Diggelen, R., Wolejko, L. et al. A comparison of fens in natural and artificial landscapes. Vegetation 126, 5–26 (1996). https://doi.org/10.1007/BF00047758

Zimmer K, Meyer C, Gebauer G (2008) The ectomycorrhizal specialist orchid Corallorhiza trifida is a partial myco-heterotroph. New Phytol 178:395–400. https://doi.org/10.1111/j.1469-8137.2007.02362.x