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FNA | Family List | FNA Vol. 9 | Rosaceae | Geum

10b. Geum macrophyllum Willdenow var. perincisum (Rydberg) Raup, Rhodora. 33: 176. 1931.

Geum perincisum Rydberg in N. L. Britton et al., N. Amer. Fl. 22: 405. 1913; G. macrophyllum subsp. perincisum (Rydberg) Hultén; G. macrophyllum var. rydbergii Farwell; G. oregonense (Scheutz) Rydberg; G. perincisum var. intermedium B. Boivin

Cauline leaves: proximal pinnate or lyrate-pinnate, distal 3-foliolate or simple and 3-lobed (divided almost to base), lobes oblanceolate to obovate. Pedicels densely puberulent, sometimes also with scattered longer hairs, stipitate-glandular. 2n = 42.

Flowering late spring–summer. Wet meadows, stream banks, thickets, muskegs, clearings, forest edges, roadsides; 100–3100 m; Alta., B.C., Man., N.W.T., Nunavut, Ont., Que., Sask., Yukon; Alaska, Ariz., Calif., Colo., Idaho, Mich., Minn., Mont., Nev., N.Mex., N.Dak., Oreg., S.Dak., Utah, Wash., Wis., Wyo.

Most specimens of Geum macrophyllum with glands on the pedicels also have the more deeply dissected leaves typical of var. perincisum; exceptions occur. Plants collected in the San Bernardino Mountains and the southern Sierra Nevada of California are so densely glandular as to fit this variety, yet their leaves are like those of var. macrophyllum. More troublesome are specimens from the Upper Peninsula of Michigan with sparsely glandular pedicels and leaves of var. macrophyllum. These plants are likely hybrids between the two varieties as their ranges overlap at the western end of the Great Lakes region. Occasional intermediate specimens were also seen from northern California to British Columbia where the ranges of the two varieties meet. Specimens of var. perincisum from around James Bay have deeply dissected leaves, but some have glandless pedicels and occasionally the styles are completely glabrous.

Variety perincisum hybridizes with Geum rivale (= G. ×pervale B. Boivin); see discussion under 8. G. rivale.


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