(2016)  
 
Two subspecies are recognized: subsp. gymnocarpa, primarily west of the Cascade-Sierra axis, and subsp. helleri (Greene) Ertter & W. H. Lewis, occurring from southeastern British Columbia and northwestern Montana to the northern Sierra Nevada in California. Subspecies gymnocarpa is further divided into var. gymnocarpa and var. serpentina Ertter & W. H. Lewis. A key, range descriptions, and representative specimens are provided for infraspecific taxa. Extensive zones of intergradation occur where the ranges intersect, especially in the Klamath and Siskiyou ranges of northeastern California and adjacent Oregon; intermediates are also common in northern Idaho and adjacent states and provinces. 

(2016)  
 
Two subspecies are recognized: subsp. gymnocarpa, primarily west of the Cascade-Sierra axis, and subsp. helleri (Greene) Ertter & W. H. Lewis, occurring from southeastern British Columbia and northwestern Montana to the northern Sierra Nevada in California.

(2016)  
 
 Subspecies gymnocarpa is further divided into var. gymnocarpa and var. serpentina Ertter & W. H. Lewis.

(2016)  
 
R. ×collaris Rydb. (pro sp.) is transferred to nothospecies status as the hybrid of R. gymnocarpa and R. woodsii Lindl.

(2016)  
 
 Presumed hybrids with sympatric species are discussed, including some across ploidy levels. Nothospecies R. ×henryana W. H. Lewis is described for the hybrid of R. gymnocarpa and R. nutkana C. Presl;