Pigeonberry provides snacks for birds

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In almost any urban park in the San Antonio  area, no matter how compacted the soil, which ecoregion or how hot and dry, if you look closely next to any tree trunk that displays roots above ground, you will find Rivina humilis (USDA symbol RIHU2) there. Throughout the state of Texas, numerous species of birds find sustenance in the fruit of these remarkably durable “pigeonberry” plants.

Photos by Rachel Cywinski

Rivina humilis is a constant example that can be used to shatter the myth of “anything birds can eat is edible for humans”. Pigeonberry fruit and leaves are toxic to humans. Yet another nickname, “rouge plant” is based on its historic use in cosmetics—perhaps a strong reason to avoid using any product that requires animal testing to determine toxicity before being sold to humans. Rivina humilis also provides support for identifying every plant by scientific name before purchasing from a grower, as many native plants are known by the common name of “pigeonberry”.

Rivina humilus “plays well with others” in the wooded landscape. In combination with other plants growing in areas that have some shade, the pink bloom spikes add delicate and noticeable color. As other deciduous plants drop leaves and become less noticeable to the passing human, this pigeonberry’s leaves flame with red color, made all the more vivid in the presence of luscious red berries.

The San Antonio Society of Friends planted Rivina humilis as a buffer between its parking lot and the walkway to its Quaker Meeting House. A planting of Malvaviscus arboreus var. drummondii behind the pigeonberry provides contrast and more visual screening.

Throughout Texas, Rivina humilus is an invaluable understory plant that provides food support for migratory and resident birds. It often goes unnoticed in the landscape among taller plants until the other plants fade and pigeonberry flames. When landscaping support is provided, gardeners may get taller plants in sheltered areas, adding even more visual appeal to humans.

See the Native Plant Information Network profile of RIHU2 for more details: https://www.wildflower.org/plants/result.php?id_plant=RIHU2

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**ARCHIVED POST AUTHOR: cywinski

About the Region

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This low-elevations region of Texas extends inland from the barrier islands, about 60 or so miles, and stretches from Brownsville to Louisiana. In total, it covers about 9.5 million acres, with a high point of 150 feet in elevation. More than 1000 species of plants can be found in this region. On the southern end, species more common in Mexico (such as Sabal mexicana) and Central America occur.

The barrier islands provide us with dune systems, and clay flats to the inland side, which have species found in these areas alone. Many plants here, such as Ipomoea pes-caprae (beach morning glory), can be found throughout tropical regions of the globe. I’ve encountered the same species on the beaches of Guam.

Once inland, vast marshes and wet prairies occur. Occasionally, oak (Quercus fusiformis) groves can be found. Common grasses include species of Bothriochloa, Paspalum, and Sporobolus; eastern gamagrass (Tripsacum dactyloides); and switchgrass (Panicum species). Many rivers and creeks cut through the Gulf Prairies, and along these riparian areas various species of trees, Sabal minor, and other plants adapted to clay soils can be found. Due to overgrazing, farming, and fire suppression, woody species such as mesquite (Prosopis glandulosa) and huisache (Acacia farnesiana), and invasive species such as chinaberry (Melia azedarach), Brazilian pepper (Schinus terebinthifolius), and Chinese tallow (Sapium sebiferum) have increased and displaced our native flora.

Source: Wildflowers of Texas by Michael Eason