Herbarium: Medicinal Plants as Information

The Cough Remedy of the Santa Monica Mountains

The Eriodictyon crassifolium (Benth) is a thick wooly shrub that is part of the Hydrophyllaceae family. A specimen of the plant was digitally collected and stored at the UCLA Herbarium, giving us greater insight on the physical characteristics and the environmental niche of the plant specimen. The digital herbarium details how the Eriodictyon Crassifolium Benth was collected by Peter H. Raven and Henry J. Thompson in the Santa Monica mountains by the borders of burned chaparral. It is identified as a corollas lavender, with distinct features in its flower patterns and thick, leathery leaves. The flowers are pale lavender in color with a bell-shape that grow in small clusters. The leaves are dark green with a thick, sticky texture that surround the woody branch and stems. These distinctive features will be further analyzed and compared to other plants within the Hydrophyllaceae family in addition to its medicinal properties.

This plant specimen was found in the Santa Monica mountains with high elevations of about 640 meters above the ground, requiring researchers to climb and hike up the mountains to collect this specimen. These plants were identified with a field guide, hand lens, binoculars, metric ruler, metric tape, altimeter, and a compass. They were then further classified using a set of rules of why, when, and how the plant specimen was identified. According to the Encyclopedia Britannia (1832), taxonomy was defined as a branch of botany that had a combination of all observations on plants. This gives us a better understanding of our specimen with the use of a sophisticated optical lens. This lens allows researchers to study specimens at a much greater depth, such as observing the buds and predicting and flowering patterns. Once the plant has been identified, plant specimens are then pressed flat between newspapers and dried in a plant press. Once the plant is dried, they are put on acid-free paper. The collector can then label and classify the specimen on the acid-free paper, then file it away.

Once the Eriodictyon crassifolium Benth, is collected and put into the herbarium, investigating the medicinal properties of the specimen becomes much easier. Its medicinal and traditional uses are detailed in the historical Materia Medica. It is known that the active ingredient in Eriodictyon crassifolium Benth is flavonoid sterubin. This means that the plant can be used to improve respiratory breathing, coughs, and fevers by turning its leaves and flowers into tea or syrup. Traditionally, Native American tribes utilized the Yerba Santa to treat lung conditions and stop minor bleedings from the 1800s to 1960s. This plant was very popular among the Native populations, even after California became colonized by the Europeans. It wasn’t until this century that the specimen was becoming an outdated remedy for respiratory illness.




Other plant species within the same family have very similar characteristics and properties. At the live observations at the UCLA Botanical Gardens, the Heliotropium Arborescens, was identified to have these similar features. It contained similar long, narrow leaves and lavender funnel-shaped flowers with small buds sprouting near the top of the plant. Field notes were also obtained of the plant observation with notes of its physical characteristics compared to the neighboring plants. The overall plant size was very tall and thin, with the lavender flowers being its most distinctive feature, compared to the other plants. There were five items collected that were found on the floor near the Heliotropium Arborescens to better observe its characteristics and habitat features. The comparison between these two plants allows us to better understand the properties and potential medicinal uses of species within the same plant family. 

WORKS CITED

Backwater Botanics. 2014. “Yerba Santa (Eriodictyon Californicum).” WordPress, June 6, 2014. https://backwaterbotanics.wordpress.com/2014/01/06/yerba-santa-eriodyction-glutinosum/.

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