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Harperella Rose. Harperella.

A monotypic genus, an annual (or perennial) herb, of temperate e. North America (Plunkett et al. 2018a). Harperella should be (re-)separated from Ptilimnium. (Feist & Downie 2008; Feist et al. 2012), as it is sister to a clade comprised of Tiedemannia (formerly the quill-leaved taxa of Oxypolis) and Ptilimnium sensu stricto (with compound leaves). The genus is sometimes considered to contain 3 species, but the characters separating the different populations are not consistent; see additional discussion under H. nodosa.

Ref: Easterly (1957); Feist & Downie (2008); Feist et al. (2012); Feist et al. (2012); Kral (1981a); Kress, Maddox, & Roesel (1994); Maddox & Bartgis (1990); Mathias & Constance (1945); Plunkett et al. (2018a) In Kadereit & Bittrich (2018); Rose (1911). Show full citations.

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image of plant© Alan M. Cressler | Harperella nodosa | Original Image ⭷
image of plant© Keith Bradley | Original Image ⭷


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