Herbarium: Medicinal Plants as Information

Bidens pilosa and Roldana petasitis: adaptations designed to enhance reproductive success

The reproductive success of a plant is often determined by effective seed dispersal, maturation, and high rates of pollination. Both Bidens pilosa and Roldana petasitis possess these features critical to their survival. Bidens pilosa with barbed seeds and Roldana petasitis with light fluffy seeds, can both undergo effective seed dispersal through means of animal-mediated dispersal, water, wind, or soil. Furthermore, the floral cues and the presence of abundant florets on both plants significantly increases visitation from pollinators, enhancing reproductive success. However, in addition to these characteristics, plants growing in tropical and temperate climates further require unique traits that allow them to efficiently transport and store water, reducing transpiration and increasing overall fitness. Both Bidens pilosa and Roldana petasitis, native to Middle America, exhibit various traits necessary to survive hot and tropical climates. For example, both plants exhibit fur-like hair on the underside of their leaves in addition to extensive venation, both of which function to significantly reduce water loss. Bidens pilosa and Roldana petasitis have evolved features that enhance their reproductive fitness and adaptation to their unique climate conditions, referenced in the historical Materia Medica and UCLA herbarium and botanical garden respectively.

Biden pilosa L. from historical Materia Medica was collected in the 1930s from waste and cultivated ground in Puerto Rico and was classified as the Asteraceace family by Nathaniel Lord Britton. Britton uses Carl Linnaeus’ Species Plantarum, published in 1753, as a reference in helping to identify the species. The contextual reasoning behind Britton’s plant collection process was to further enhance scientific knowledge and provide information in regards to plant distribution and biodiversity in Puerto Rico. Britton’s documentation of plant diversity in Puerto Rico allowed him to develop a forest policy plan for the Puerto Rican government in order to promote reforestation and conservation (NYBG's Scientific Research in Puerto Rico: More Than a Century of Fruitful Collaboration).

The flower of Roldana petasitis collected under the plant bushes in the UCLA Botanical Garden near Jewel Terrace on Feb 4, 2022 was identified as Roldana petasitis of the Asteraceae family using the plant identification cards present in the garden. The contextual reasoning behind the plant collection process was to perform a comparative analysis between two plants of the same family, Roldana petasitis with Bidens pilosa. The Bidens pilosa specimen from UCLA’s Herbarium was collected along a sidewalk/bike path parallel to Interstate 405 and VA properties by Anthony Baniaga and identified as Bidens Pilosa L of the Asteraceae family. The specimen may have been identified as Bidens Pilosa L using bencao literature review, botanical origin identification, macroscopic and microscopic identification, and physical and chemical identification. Since the specimen was collected in Nov 10, 2021, it is likely that Bidens Pilosa L was identified using botanical origin identification. Similar to Britton’s contextual reasoning behind the plant collection process, the specimen was also collected to further enhance scientific knowledge and provide information in regards to specific plant distribution and biodiversity of the area.


Bidens pilosa has been most commonly used, medicinally, among the indigenous people of the Amazon. Historically, they used it to treat foot-and-mouth disease, angina, diabetes, menstrual disorders, hepatitis, laryngitis, intestinal worms, and for inflammation, both internal and external. In general, Bidens pilosa has been reported to be useful in treating more than forty diseases and disorders. Used both internally and externally, this includes inflammation, immunological disorders, digestive disorders, infectious diseases, cancers, metabolic syndrome, and wounds. In addition to these more well known and documented uses, the bioactive compounds produced by Bidens pilosa such as polyynes and flavonoids have also exhibited the potential to successfully treat cardiovascular diseases and disorders. This includes lowering systolic blood pressure, reducing cardiac hypertrophy, and the treatment of diseases such as atherosclerosis and coronary artery disease. Today, the plant is well-known for its medicinal uses throughout South America with much of their modern plant research functioning to validate and verify the original indigenous uses of the plant. Unlike South America, the plant is not medicinally used in the U.S. as it is not as widely available.

WORKS CITED

Bartolome, Arlene P., Irene M. Villaseñor, and Wen-Chin Yang. 2013. “Bidens Pilosa L. (Asteraceae): Botanical Properties, Traditional Uses, Phytochemistry, and Pharmacology.” Evidence-Based Complementary and Alternative Medicine 2013 (July): 340215.
Frances W. Horne Papers (PP)Horne, Frances Worth, 1873-1967. Archives & Manuscripts The LuEsther T. Mertz Library,The New York Botanical Garden.
“NYBG's Scientific Research in Puerto Rico: More Than a Century of Fruitful Collaboration.” New York Botanical Garden.
“Picao Preto.” Picao Preto - Bidens pilosa Database in the Tropical Plant Database of herbal remedies.
WFO Monographs Details, The William & Lynda Steere Herbarium.

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