Foamflowers in North Carolina

In November 2022, iNaturalist split Tiarella cordifolia into five species, all but one of which occur in North Carolina: Tiarella stolonifera, Tiarella cordifolia sensu stricto, Tiarella austrina, and Tiarella nautila. These four species are widely distributed throughout central and western North Carolina.

Distribution of Tiarella in North Carolina counties (overlap in bold):

• Tiarella stolonifera: Alleghany, Ashe, Avery, Buncombe, Burke, Madison, McDowell, Mitchell, Watauga, Wilkes, Yancy
• Tiarella cordifolia sensu stricto: Alamance, Alexander, Alleghany, Avery, Burke, Cabarrus, Caldwell, Catawba, Chatham, Cleveland, Cumberland, Davie, Durham, Forsyth, Gaston, Granville, Guilford, Harnett, Iredell, Johnston, Lee, Lincoln, McDowell, Mecklenburg, Montgomery, Orange, Randolph, Rockingham, Rowan, Rutherford, Stanly, Stokes, Surry, Union, Wake, Wilkes, Yadkin
• Tiarella austrina: Buncombe, Cherokee, Clay, Graham, Haywood, Henderson, Jackson, Macon, Polk, Swain, Transylvania
• Tiarella nautila: Cherokee

Observations of Tiarella stolonifera in North Carolina:

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

Observations of Tiarella cordifolia sensu stricto in North Carolina:

• Observations of Tiarella cordifolia in an expected county in NC
• Observations of Tiarella cordifolia in an unexpected county in NC

Observations of Tiarella austrina in North Carolina:

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

Observations of Tiarella nautila in North Carolina:

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

Tips for identification of Tiarella species:

• Identification of Tiarella austrina
• Identification of Tiarella cordifolia sensu stricto
• Identification of Tiarella nautila
• Identification of Tiarella stolonifera

The ranges of Tiarella stolonifera and Tiarella cordifolia are adjacent along the Blue Ridge Mountains in western Maryland and western Virginia, but along the northwestern border of North Carolina, the ranges overlap. See the companion article Foamflowers in Maryland and Virginia for tips how to distinguish the two species.

The ranges of Tiarella stolonifera and Tiarella austrina are continuous (and mostly non-overlapping) along the entire western border of North Carolina. Tiarella austrina is distinguished by the presence of a stem leaf (which Tiarella stolonifera does not have).

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 27, 2022 04:15 TARDE por trscavo