Other Commonly Used Names: spreading false foxglove, spreading yellow false foxglove

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SPREADING YELLOW FOXGLOVE Scientific Name: Aureolaria patula (Chapman) Pennell Other Commonly Used Names: spreading false foxglove, spreading yellow false foxglove

Previously Used Scientific Names: Dasystoma patula Chapman, Gerardia patula (Chapman) A. Gray Family: Scrophulariaceae (snapdragon) or Orobanchaceae (broomrape) Rarity Ranks: G3/S1 State Legal Status: Threatened Federal Legal Status: none Federal Wetland Status: none Description: Perennial herb 3-4 feet (1-1.2 meters) tall, parasitic on the roots of oaks. Stems leaning on other plants, sprawling on the ground, or erect; green tinged with reddish-purple. Leaves opposite, mostly hairless except on veins; mid- and lower stem leaves up to 5-8 inches (13-20 cm) long, deeply lobed and toothed, forming a narrow wing on the leaf stalk; upper leaves smaller, lance-shaped, and toothed. Flowers up to 1⅜ inches (3-3.5 cm) long, yellow, with a funnel-shaped tube and 5 spreading petals; flower stalk ½ - 1 inch (1.2-2.5 cm) long and less than 1 /32 inch (0.5 mm) thick; flower, sepals, and stalk covered with tiny, soft hairs. Fruit oval, hairless, less than ¼ inch (5-6 mm) long, on a stalk ½ - 1 inch long. Similar Species: False-foxglove (Aureolaria laevigata) leaves have only a few teeth and are not deeply lobed. Downy false-foxglove (A. virginica) has hairy fruit; it flowers May July. Smooth false-foxglove (A. flava) is mostly hairless; its flower stalks curve strongly upward. All of these species have shorter (less than ⅜ inch or 8 mm long) and thicker (about 1 / 16 inch or 1.5 mm) flower stalks. Related Rare Species: None in Georgia. Habitat: Coosa Valley flatwoods with moist, calcium-rich soil. Life History: Spreading yellow foxglove is a hemiparasite it has chlorophyll and photosynthesizes, but it also connects to other plants by means of haustoria (tiny, root-like organs that embed into the roots of host plants) in order to withdraw water and nutrients. Known host plants include sweet gum (Liquidambar styraciflua), red bud (Cercis canadensis), ironwood (Carpinus caroliniana), and flowering dogwood (Cornus florida). Spreading yellow foxglove is self-incompatible and relies on bumblebees and other insects to effect cross-pollination. Survey Recommendations: Surveys are best conducted during flowering (August October) and fruiting (September October) Range: Georgia, Alabama, Tennessee, and Kentucky. Threats: Clearcutting in lowland forests, stream impoundment, cattle grazing, invasion by exotic pest plants.

Georgia Conservation Status: Three populations, with a total of about 1000 plants, are known; 2 of these populations are on conservation land. Conservation and Management Recommendations: Protect streamside forests from clearcutting, impoundment, development, cattle grazing, and trampling. Eradicate exotic pest plants, especially Chinese privet and Japanese honeysuckle. Selected References: Chafin, L.G. 2007. Field guide to the rare plants of Georgia. State Botanical Garden of Georgia and University of Georgia Press, Athens. Cunningham, M. 1999. Demographic trends and host interactions of the rare hemiparasite, Aureolaria patula (Scrophulariaceae). Dissertation, University of Tennessee, Knoxville. Cunningham, M. and M. Cruzan. 1998. Population biology and conservation of a rare plant of the southern Appalachians, Aureolaria patula (Scrophulariaceae). 9th Annual SAMAB Conference, Gatlinburg, Tenn. Govus, T.E. 1999. Survey for Clematis socialis and significant calcareous flatwoods. Georgia Natural Heritage Program, Social Circle, Georgia. Horn, D., T. Cathcart, T.E. Hemmerly, and D. Duhl. 2005. Wildflowers of Tennessee, the Ohio Valley, and the southern Appalachians. Lone Pine Publishing, Auburn, Washington. Kral, R. 1983. A report on some rare, threatened, or endangered forest-related vascular plants of the South. Technical Publication R8-TP2. United States Forest Service, Atlanta. NatureServe. 2007. NatureServe Explorer. Arlington, Virginia. http://www.natureserve.org/explorer Pennell, F.W. 1935. Scrophulariaceae of eastern temperate North America. Monograph No. 1. Academy of Natural Sciences, Philadelphia. Ware, R.T., Sr. 1999. Summary report: survey for Clematis socialis and other rare plants of the significant calcareous or Coosa flatwoods in the Ridge and Valley province of northwest Georgia. Georgia Natural Heritage Program, Social Circle. Weakley, A.S. 2007. Flora of the Carolinas, Virginia, Georgia, and surrounding areas. University of North Carolina Herbarium, Chapel Hill. Author of species account: Linda G. Chafin Date Compiled or Updated: L. Chafin, Aug. 2007: original account K. Owers, Jan. 2010: updated status and ranks, added pictures