Herbarium: Medicinal Plants as Information

The Cough Remedy of the Santa Monica Mountains

Throughout the quarter, we had the opportunity to explore the Eriodictyon crassifolium Benth through the UCLA herbarium and historical Materia Medica, and Heliotropium Arborescens through the Botanical Gardens. First, the Eriodictyon crassifolium Benth had a short summary through the UCLA herbarium which gave us a good initial understanding of the specimen. However, when we began to look at Materia Medica, we were able to get more detailed information about our specimen on the online setting. 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 and is classified in the Hydrophyllaceae family. Since this plant was at such a high elevation, they must have had to either climb or hike all the way up the mountain to collect this specimen safely and securely. The UCLA Botanical Gardens unfortunately did not have our exact plant, but we were able to look at a similar specimen, Heliotropium Arborescens, that came from the same family as our original plant. Through this, we were able to compare and contrast the two plants as they had similar and varying characteristics.

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. 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 gave us the opportunity 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 our specimen, the Eriodictyon crassifolium Benth, was collected and put into the herbarium, we were then able to investigate the medicinal properties of our specimen. The active ingredient in Eriodictyon crassifolium Benth is flavonoid sterubin. This plant is used to improve respiratory breathing, coughs, and/or fevers by turning it into either a tea or a syrup. Native American tribes utilized 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.




The specimen that we observed at the at the UCLA Botanical Garden, the Heliotropium Arborescens, was collected in a very similar way. From our live observations of the plant, we noticed very similar physical characteristics of the Heliotropium Arborescens compared to the Eriodictyon crassifolium Benth. For example, they both contain an abundance of long, narrow leaves near the bottom of the plant and lavender flowers with small buds sprouting near the top of the plant. During our live observation, we took field notes of the Heliotropium Arborescensand noted down its physical characteristics and compared it with neighboring plants. We noticed that the overall plant size was very tall and thin, with the lavender leaves as its most distinctive feature, compared to other plants. We also collected five different items that we found on the floor of the Heliotropium Arborescens to better observe its characteristics and habitat features. The comparison between these two plants allow us to better understand its properties and potential medicinal uses. 

WORKS CITED

“Yerba Santa (Eriodictyon Californicum).” LONE PINE. WordPress, June 13, 2014. https://backwaterbotanics.wordpress.com/2014/01/06/yerba-santa-eriodyction-glutinosum/.

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