Herbarium: Medicinal Plants as Information

Parasitic Plants

Our project presents the process of collecting and researching the special characteristics of parasitic plants. We explore each plant's respective medical practices and compare them to epiphytic plants that are similar to our original plants of interest. In each project, we individually explain how the plants were collected, identified, translated, and classified. The contextual reasons behind this process are also presented and connected to the general unique characteristics of parasitic plants. Each page provides a collection of media images that visually represent the main plant of interest, the epiphytic plant, the historical materia medica image, and the individual journal observations that we made of our respective plants. We offer comparative analysis and highlight important parts of each specimen throughout these photos.   

Parasitic plants are plants that derive some or all of its nutritional requirements from another living plant. As a result, parasitic plants have many special characteristics as they are usually observed as growing on the other plants’ body. Parasitic plants also have many chemical properties, including medical properties. Throughout history, parasitic plants have been observed to be used in many purposes of medical treatments. There are also many types of parasitic plants, different from areas or families. In this project, we will introduce some parasitic plants: Phoradendron leucarpum subsp. Macrophyllum, Rhipsalis tetragone (epiphyte), Pedicularis densiflora (Indian Warrior) and the Platycerium superbum (Staghorn Fern). Presenting our collecting process and our observations, we will analyze how unique parasitic plants characteristics are and how they contribute to materia medica. 

Over the duration of the quarter, our group has had the opportunity to explore and study multiple specimen of parasitic plants within different UCLA and other non-affiliated collections. The first collection we explored was that of the UCLA Herbarium through an online data base format called CCH2. This data base holds a vast collection of plant specimen from different herbariums across the nation, including our very own UCLA Herbarium. Although learning to navigate the CCH2 database provided us with valuable introduction to metadata and collection, we eventually had the opportunity to view our UCLA Herbarium specimen plants in person. Additionally, our group searched for these plants within the context of the “Materia Medica” using the Wellcome Collection. We were unable to find records related to the original plants, however, we were able to find historical images of parasitic plants that were quite similar. Lastly, our group observed specimen within the collection of plants at the Mildred E. Mathias Botanical Garden at UCLA. Unfortunately, the gardens featured very few parasitic plants (for obvious reasons), so instead we observed epiphytic plant specimen.

Following the UCLA Herbarium, UCLA Botanical garden, and Materia Medica Viscum album, the first two plants we will introduce are Phoradendron leucarpum subsp. Macrophyllum and Rhipsalis tetragone (epiphyte). Phoradendron leucarpum subsp. Macrophyllum was collected in the database of UCLA Herbarium; Rhipsalis tetragone (epiphyte) was observed in the botanical garden. From the Viscum album, we will present the medical properties of mistletoe, the common names of both two plants. 

Phoradendron leucarpum subsp. Macrophyllum was observed from the media from the CCH2 resource of UCLA herbarium. The specimen was collected on 5th February 2018 by Rudy Diaz. Through our observation from the media, some unique characteristics of Phoradendron leucarpum subsp. Macrophyllum are the thin stem, smooth dark yellow green leaves, and small buddings. A general medical property is that the plant is toxic to consume by mouth, they resorted to taking extracts from these parts of the plant. 

Rhipsalis tetragone (epiphyte) was observed from UCLA Botanical Garden. We have had the chance to walk into the garden and observe the characteristics and environment of Rhipsalis tetragone (epiphyte). It was located under a warm and dry environment and was grown on Metrosideros kermadecensis, the supporting tree. Some highlight characteristics are the thin, straight, uniform bright green color, lightweight stem of Rhipsalis tetragone (epiphyte). Rhipsalis tetragone (epiphyte) has shown another perspective on parasitic plants. 

One of the major points of comparisons between Pedicularis Densiflora and Platycerium superbum is the intrinsic nature of the plants: parasite vs. epiphyte, respectively. While epiphytes like the Staghorn Fern differ from parasites like Indian Warrior in that epiphytes are plants that grow on other plants for physical support without obtaining benefits or causing harm to the host plant, both species do rely on other plants. Both the Staghorn Fern and Indian Warrior were found to be growing on or near other plants in nature, whether in the UCLA Botanical Gardens or Santa Monica Mountains. Epiphytes are found living on the surface of a plant, such as the Watkin’s Fig, while parasites are generally found to be living in or on the host, as seen in the case with Indian Warrior.

Pedicularis Densiflora and Platycerium superbum do not come from the same species or genus and can each be attributed their own unique medicinal properties. However, some overlap of medicinal uses have been observed. Both plants may relieve cases of hypertension or anxiety, perhaps suggesting that because the parasite and epiphyte share similar properties in their living on or near another plant, they may contribute similar medicinal uses for cases of stress and tension. Further research needs to be done to explore if this correlation truly exists.

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