Flora of North America species comparison

Species 400–600 (37 in the flora).

E. Hultén (1968) listed three Pedicularis taxa in his Flora of Alaska and Neighboring Territories that do not occur in the flora area; P. amoena Adams ex Steven, P. kanei Durand subsp. adamsii (Hultén) Hultén, and P. villosa Ledebour ex Sprengel are found on the Chukchi Peninsula of Siberia.

The most common chromosome number for Pedicularis is 2n = 16. Two species are reported to have a diploid number of 2n = 12, and at least five species have a number of 2n = 14. See reviews in Jie C. et al. (2004) and M. I. S. Saggoo and D. K. Srivastava (2009).

Infrageneric classification of Pedicularis is both difficult and incomplete. The author has not attempted to present one for the North American taxa. Inconsistencies result from using either floral morphology or phyllotaxy to construct major subgeneric groups (C. Steven 1823; G. Bentham 1835; C. J. Maximowicz 1888; D. Prain 1890; G. Bonati 1918; Tsoong P. C. 1955); the latter author proposed 130 series to accommodate the worldwide variation in Pedicularis. Recognizing that floral form probably evolved in parallel among groups, Li H. L. (1948) employed phyllotaxy to erect three informal subgeneric taxa (greges) for the Pedicularis of China, including grex Allophyllum, species with alternate leaves; grex Cyclophyllum, species with opposite or verticillate arrangement of leaves; and grex Poecilophyllum, species with alternate to subopposite leaves on the same plant. However, molecular phylogenies (Yang F. S. et al. 2003; R. H. Ree 2005; B. W. Robart et al. 2015; Yu W. B. et al. 2015) indicate inconsistencies even in the treatment by Li, although the study by Yu et al., which included 257 species, did show that grex Cyclophyllum is monophyletic.

Pediculariopsis was described to account for species (for example, Pedicularis verticillata) that exhibit a different base chromosome number (x = 6 versus x = 8). That concept has not been accepted by others, because there is little morphological support.

The use of infraspecific ranks in Pedicularis follows T. F. Stuessy (1990), who argued that the subspecific rank is appropriate when several obvious morphological differences are associated with an allopatric or peripatric geographical pattern, whereas the varietal rank is appropriate when one to few differences are associated with more or less geographic overlap. Unfortunately, Pedicularis specialists have not used these levels consistently. The subspecies rank is used here, except in P. bracteosa, P. centranthera, and P. contorta.

Pedicularis is a common element of arctic and alpine habitats in the Northern Hemisphere, with the greatest concentration of species occurring in Asia.

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

Pedicularis oederi is known from the mountains of Europe, Asia, and western North America.

Two arctic species can be easily confused with Pedicularis oederi. Pedicularis flammea also has bicolored flowers that are yellow with galeas that are red- or purple-tipped, but the flowers of P. oederi are twice the size of those of P. flammea. The flowers of P. capitata are sometimes also yellow but may or may not be bicolored. If bicolored, the color is more diffuse and lighter than that of either P. flammea or P. oederi. The flowers of P. capitata are also larger than those of P. oederi. In addition, the inflorescences of P. capitata usually have no more than five flowers clustered at the tips, while those of P. oederi have at least 10 to 50 flowers along at least one third their lengths. H. J. Scoggan (1978–1979) listed P. oederi var. albertae based upon its densely woolly inflorescence.

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