Flora of North America species comparison

Potentilla anglica apparently is a product of hybridization involving P. erecta and P. reptans (B. Matfield and J. R. Ellis 1972) that has become stabilized and distinct from both parents. In Europe, it forms back-cross hybrids with both P. erecta (P. ×suberecta Zimmeter) and P. reptans (P. ×mixta Nolte); these hybrids are not known from North America. A garden hybrid supposedly between P. anglica and P. nepalensis Hooker (known as P. ×tonguei Mallett) was found in Allegany State Park, New York, but this was likely cultivated rather than naturalized.

Potentilla anglica probably was introduced even in Newfoundland (A. Kurtto et al. in J. Jalas et al. 1972+, vol. 13), contrary to the view expressed by M. L. Fernald (1950).

The name Potentilla procumbens Sibthorp was previously used for this species; that is a superfluous and illegitimate name.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Revolute epicalyx bractlets and visible glands on the sepal tips are the most reliable characteristics to distinguish Potentilla litoralis from P. bipinnatifida where their ranges overlap in the northern Great Plains. The former is also more likely to be decumbent-ascending and tends to darken more in drying. Intermediates occur, as well as possible hybrids with P. bimundorum, P. hippiana, and P. pensylvanica.

Rydberg described Potentilla litoralis to accommodate the coastal phase of this species, concentrated around the Gulf of St. Lawrence and along the north Atlantic Coast as far south as New Hampshire. Potentilla pectinata Rafinesque was briefly adopted as the older name (for example, Frère Marie-Victorin 1935); it is both superfluous and a later homonym (B. Boivin 1952). The homotypic synonyms P. pensylvanica var. glabrata (Lehmann) S. Watson, P. bipinnatifida var. glabrata (Lehmann) Kohli & Packer, and P. glabrella Rydberg have been misapplied to P. litoralis; the type is a specimen of P. ovina var. ovina (sect. Multijugae) (J. Soják 1996). The type of P. dissecta Pursh, traditionally applied to P. glaucophylla (sect. Graciles), is closest to this species but has palmate leaves; ambiguity has led to the name being rejected (B. Ertter et al. 2008).

The current circumscription of Potentilla litoralis includes prairie populations extending through the northern Great Plains and boreal regions into eastern Alaska; those plants have generally been called P. virgulata when not combined with P. bipinnatifida, P. multifida in the broad sense, or P. pensylvanica. Outlying populations occur at least as far south as Wyoming (including the type of P. virgulata), central Nevada (possibly as introductions), and, possibly, Colorado.

Other than the tendency of prairie plants to be somewhat larger and more erect than the coastal plants, no significant morphologic distinctions have been found to match the differences in habitat and distribution. Based on their distribution map, B. L. Kohli and J. G. Packer (1976) considered the coastal and prairie populations, as well as what is here separated as Potentilla jepsonii, to comprise a single taxon, which they called P. bipinnatifida var. glabrata (Lehmann) Kohli & Packer (misapplied).

If Potentilla litoralis is treated as a variety of another species, var. virgulata has priority at varietal rank.

Unequivocal Potentilla litoralis barely enters Alaska; the majority of collections from central, western, and northern Alaska previously placed in P. litoralis represent an undescribed taxon whose dimensions are not included in the preceding description. Significant differences include more deeply incised leaflets with fewer teeth, flat, linear epicalyx bractlets, and larger petals. Some collections from around Kotzebue with relatively wide sepals and sparse glands may indicate hybridization with P. bimundorum.

(Discussion copyrighted by Flora of North America; reprinted with permission.)