Herbarium: Medicinal Plants as Information

Amelanchier alnifolia: Native uses and Neocolonial Pharmaceutical Potential

Three Sources of Investigation

The UCLA Herbarium, site to roughly 200,000 preserved floral specimens from North America, Europe, and California, presents one fundamental source of knowledge regarding the type morphology of Amelanchier alnifolia. The specimen on record at the UCLA Herbarium was collected by W. J. Cody in situ near Yellowknife in the Northwest Territories of Canada on June 27, 1949, with the help of an additional collector J.B. McCanse. These collectors recorded little information regarding the material conditions present in and around the source plant, however some information may nevertheless be gleamed from the specimen label. The host plant of the preserved clipping was identified in humus-rich soil at the water's edge, relatively rare in its local ecology.  Visually, the specimen consists of a branch cutting from a larger specimen, measuring approximately 45 centimeters and possessing multiple, slender sub-branches with leaves and flowers. Leaves are a dark green and ovate in shape, with a noticeable central midrib and sharp serrations beginning from the midline. At the apex of several terminal branches grow clusters of delicate yellow-dried flowers with five petals and intricate venation.

The second collection examined was a digital collection of historical documents dated from the turn of the 19th century, situating Amelanchier alnifolia in the Materia Medica. A related specimen of the same genus, Amelanchier canadensis, was identified from the POWO herbarium database. This specimen was presented by Dr. Hoover in February of 1868 and is housed at the Royal Botanic Gardens. The specimen label  in the lower right image of the recorded image signifies important metadata like, the collector, a ruler for measuring, the date, and species identified. This specimen is a smaller bunch of leaves than the Amelanchier specimen housed at UCLA herbarium, but contains many of the same hallmarks such as mature, green, and ovate-shaped leaves and yellow flowers growing at the apex of thin branches. However, the recorded metadata of this specimen is far less robust than the UCLA Herbarium classification, likely a product of the laxer consideration of context given that this specimen was recorded 154 years prior. Another historical documentation of A. alnifolia comes from a 1896 encyclopedia and field guide of the native silva of North America compiled by the American botanist Charles Sprague Sargent. In this treatise, Sargent provides a brief overview of the morphology and observed uses of A. alnifolia, and enlisted the engraver Charles Edward Faxon to produce a representative botanical illustration. Faxon depicts the plant from various angles and times of year, including a flowering and fruiting branch alongside a dormant winter branch, an impossible combination meant to aid naturalists year-round. Curiously, Sargent spends a significant amount of space to describe the established ornamental and woodworking purposes of the plant (signifying that it had been fairly familiar to Americans by the turn of the century), while devoting only one sentence to how the Indigenous peoples of North America interacted with it.

A tertiary resource explored was the UCLA Mildred E. Mathias Botanical Gardens, where a living specimen of a related species, Rhaphiolepis umbellata, could be observed to find common distinguishing features across the family Rosaceae. This set documented the growth habit and ecological relationships surrounding a plant within the same family (Rosaceae), Raphiolepis umbellata. This species, unlike Amelanchier alnifolia, is native to the Old World, with a range throughout Korea, Japan, and Taiwan. The cultivated specimen is roughly 5 feet in height and 2-3 feet in width, growing as a dense thicket of wooden branches and deciduous leaves. R. umbellata is morphologically similar to A. alnifolia in several regards: both species share similar leaf size, growth distribution, and overall shape; flowers on R. umbellata are white and cup-shaped (likely the same as a fresh specimen of A. alnifolia); and both plants produce morphologically similar indigo berries. The Rhaphiolepis umbellata ‘Minor’ specimen found in the CCH2 data portal was collected by L. Haines on April 21th, 1950. It is located near the amphitheater in the UCLA Botanical Garden in Los Angeles, California.

Medical Practice and Bioprospecting

A majority of modern research into A. alnifolia focuses on the nutrient content and possible metabolic activity of its berries, which have been touted as a “superfood” by celebrities and various nutraceutical companies. Serviceberries have long been used by settler-colonists in a culinary context in the form of preserves, pastries, and various brewed beverages, but new research highlights their free radical scavenging ability and high mineral content. Several compounds extracted from the berries of A. alnifolia belong to the larger family of polyphenols implicated in lipid regulation and storage, including anthocyanins, catechins, and tocopherols (Vitamin E). Most advertisers of the saskatoon elevate its supposedly miraculous weight-loss properties while ignoring its far more storied history in Indigenous communities across North America, each of which developed unique relationships to A. alnifolia. The dried berries of this plant were a staple component in Northern plains diets in the production of pemmican, a non-perishable blend of dried meats, carbs, and foraged fruits that helped populations weather out times of winter scarcity. Across tribes of the Pacific Northwest, the Great Plains, and the subarctic, A. alnifolia has been used as a key ingredient in tonics meant to alleviate symptoms of viral respiratory infections, aid in childbirth, and as a curative laxative. Both the plant leaves and bark were utilized to meet these ends; for example, thin strips of bark were boiled as part of a “10-bark medicine” for treatment of tuberculosis, venereal disease, and stomach ulcers. Bark-based medicine in particular sometimes carried a spiritual aspect as well: according to two elder women of the Coast Salish tribe explain, as the cut from which bark was taken began to callous and heal, patients in turn were expected to begin their recovery. Use of these natural medicines required adherence to a strict code of collection, requiring a specific confluence of natural conditions, seasonality, and regalia to achieve effect.

Some biomedical researchers have investigated the therapeutic potential of Amelanchier alnifolia, observing moderate effects in vitro. While these findings should not overshadow the living Indigenous history involving this plant, their implications for new forms of curative medicine cannot be ignored. Methanolic extracts of axial branches were shown to possess highly active antiviral properties against enteric coronaviruses (such as the common cold) by McCrutcheon et al (1995), suggesting their potential for prophylactic or antiviral therapeutics.


 

 

 

 

 




Citations

  1. Abe, Tetsuto, and Michio Matsunaga. 2011. “Geographic Variation in Germination Traits in Melia Azedarach and Rhaphiolepis Umbellata.” American Journal of Plant Sciences 02 (01): 52–55. https://doi.org/10.4236/ajps.2011.21007.
  2. Curtis, Edward. n.d. “Ethnobotany and Native Plant Production,” 9.
  3. Gottesfeld, Leslie M. Johnson. 1992. “The Importance of Bark Products in the Aboriginal Economies of Northwestern British Columbia, Canada.” Economic Botany 46 (2): 148–57. https://doi.org/10.1007/BF02930629.
  4. Lavola, Anu, Reijo Karjalainen, and Riitta Julkunen-Tiitto. 2012. “Bioactive Polyphenols in Leaves, Stems, and Berries of Saskatoon (Amelanchier Alnifolia Nutt.) Cultivars.” Journal of Agricultural and Food Chemistry 60 (4): 1020–27. https://doi.org/10.1021/jf204056s.
  5. McCutcheon, A. R., T. E. Roberts, E. Gibbons, S. M. Ellis, L. A. Babiuk, R. E. W. Hancock, and G. H. N. Towers. 1995. “Antiviral Screening of British Columbian Medicinal Plants.” Journal of Ethnopharmacology 49 (2): 101–10. https://doi.org/10.1016/0378-8741(95)90037-3.
  6. Ozga, Jocelyn A, Asma Saeed, and Dennis M Reinecke. 2006. “Anthocyanins and Nutrient Components of Saskatoon Fruits ( Amelanchier Alnifolia Nutt.).” Canadian Journal of Plant Science 86 (1): 193–97. https://doi.org/10.4141/P05-139.
  7. Rus Jacquet, Aurélie de, Mitali Arun Tambe, Sin Ying Ma, George P. McCabe, Jay Hansford C. Vest, and Jean-Christophe Rochet. 2017. “Pikuni-Blackfeet Traditional Medicine: Neuroprotective Activities of Medicinal Plants Used to Treat Parkinson’s Disease-Related Symptoms.” Journal of Ethnopharmacology 206 (July): 393–407. https://doi.org/10.1016/j.jep.2017.01.001.
  8. Turner, Nancy J. 2001. “‘Doing It Right’: Issues and Practices of Sustainable Harvesting of Non-Timber Forest Products Relating to First Peoples in British Columbia.” Journal of Ecosystems and Management, December. https://jem-online.org/forrex/index.php/jem/article/view/215.
  9. Turner, Nancy J., and Richard J. Hebda. 1990. “Contemporary Use of Bark for Medicine by Two Salishan Native Elders of Southeast Vancouver Island, Canada.” Journal of Ethnopharmacology 29 (1): 59–72. https://doi.org/10.1016/0378-8741(90)90098-E.
  10. Uprety, Yadav, Hugo Asselin, Archana Dhakal, and Nancy Julien. 2012. “Traditional Use of Medicinal Plants in the Boreal Forest of Canada: Review and Perspectives.” Journal of Ethnobiology and Ethnomedicine 8 (January): 7. https://doi.org/10.1186/1746-4269-8-7.

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