Foamflowers in Tennessee

In November 2022, iNaturalist split Tiarella cordifolia into five species, all but one of which occur in Tennessee: Tiarella stolonifera, Tiarella wherryi, Tiarella austrina, and Tiarella nautila. These four species are widely distributed throughout central and eastern Tennessee.

Distribution of Tiarella in Tennessee counties (overlap in bold):

• Tiarella stolonifera: Anderson, Campbell, Carter, Claiborne, Grainger, Greene, Hancock, Hawkins, Knox, Morgan, Roane, Scott, Unicoi, Union, Washington
• Tiarella wherryi: Anderson, Bedford, Bledsoe, Bradley, Campbell, Cannon, Coffee, Cumberland, Davidson, DeKalb, Fentress, Franklin, Giles, Grundy, Hamilton, Hickman, Jackson, Knox, Lawrence, Lewis, Lincoln, Loudon, Macon, Marion, Marshall, Maury, McMinn, Meigs, Monroe, Moore, Morgan, Overton, Pickett, Polk, Putnam, Rutherford, Rhea, Roane, Scott, Sequatchie, Smith, Sumner, Trousdale, Van Buren, Warren, Wayne, White, Williamson, Wilson
• Tiarella austrina: Blount, Cocke, Franklin, Monroe, Sevier
• Tiarella nautila: Monroe, Polk

Observations of Tiarella stolonifera in Tennessee:

• Observations of Tiarella stolonifera in an expected county in TN
• Observations of Tiarella stolonifera in an unexpected county in TN

Observations of Tiarella wherryi in Tennessee:

• Observations of Tiarella wherryi in an expected county in TN
• Observations of Tiarella wherryi in an unexpected county in TN

Observations of Tiarella austrina in Tennessee:

• Observations of Tiarella austrina in an expected county in TN
• Observations of Tiarella austrina in an unexpected county in TN

Observations of Tiarella nautila in Tennessee:

• Observations of Tiarella nautila in an expected county in TN
• Observations of Tiarella nautila in an unexpected county in TN

Tips for identification of Tiarella species:

• Identification of Tiarella austrina
• Identification of Tiarella nautila
• Identification of Tiarella stolonifera
• Identification of Tiarella wherryi

The ranges of Tiarella stolonifera and Tiarella wherryi overlap in south-central Kentucky and north-central Tennessee. See the companion article Foamflowers in Kentucky for tips how to distinguish the two species. Three species of Tiarella have been found in two counties in southeastern Tennessee. Tiarella austrina, Tiarella nautila, and Tiarella wherryi occur in Monroe County, while hybrid populations of Tiarella nautila and Tiarella wherryi occur in Polk County. Consequently, identification of Tiarella in southeastern Tennessee can be very difficult.

For details, including a color-coded range map and an identification key, see: Nesom, Guy L. (2021). "Taxonomy of Tiarella (Saxifragaceae) in the eastern USA" (PDF). Phytoneuron. 31: 1–61. (A shortened version of Nesom's paper was published by the North Carolina Botanical Garden in 2022.)

For more general information about Tiarella, see: Observing and identifying Foamflowers in eastern North America

Publicado el diciembre 22, 2022 08:59 TARDE por trscavo