Large-fruited sand-verbena

Description

Abronia macrocarpa is a rare species of flowering plant known by the common name largefruit sand verbena. It is endemic to eastern Texas, where its current range is limited to Freestone, Leon, and Robertson counties. It inhabits harsh, open sand dunes on savannas, growing in deep, poor soils. It was first collected in 1968 and described as a new species in 1972.It is a federally listed endangered species of the United States. Abronia macrocarpa is a perennial herb with a hairy, glandular stem growing up to half a meter tall. The glandular oval leaf blades are up to 5 centimeters long by 3.5 wide and are borne on relatively long petioles. The inflorescence is a cluster of up to 75 magenta or light purple flowers each up to 3 centimeters long. The tubular, strongly fragrant flowers open at dusk and are pollinated by moths.The winged fruit is up to 1.5 centimeters long. It is dispersed by wind. Its natural habitat is sandy soils with little other vegetation, often in openings of post-oak woodlands. Threats to this endangered species include habitat loss as its range is consumed for development and oil exploration.The habitat is also damaged by off-road vehicles, people on foot and on horseback, fire suppression activity, and the invasion of non-native species such as bermudagrass and weeping lovegrass (Eragrostis curvula).The total remaining number is estimated at several thousand individual plants in nine populations. Abronia, the sand-verbenas or wild lantanas, is a genus of about 20 species of annual or perennial herbaceous plants in the family Nyctaginaceae. Despite the common names, they are not related to Verbena (vervains) or lantanas in the family Verbenaceae. They are closely allied with Tripterocalyx. They are native to western North America, from Alberta and Saskatchewan, Canada, south to west Texas, California, Baja California and central Mexico, growing on dry sandy soils. Abronia macrocarpa, a Texas endemic, is protected under the Endangered Species Act. Abronia ammophila, the Yellowstone sand verbena, is a plant unique to Yellowstone National Park's lakeshores and is endemic to the park. Only a few species are widespread, and many are quite rare. They make very attractive garden plants for hot, dry sandy sites.