Geum macrophyllum Willd.
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Rosaceae
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Scientific Name
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Description
Species Description - Stem to 1 m, hirsute, especially below; basal lvs long- petioled, the terminal segment rotund to reniform, 5–12 cm wide, often 3–lobed, the lateral few, much smaller, interspersed with several to many minute lfls; upper lvs short-petioled to sessile, deeply 3-lobed or 3-foliolate; pet yellow, 4–7 mm, somewhat exceeding the sep; achenes minutely pubescent throughout, hirsute about the summit; basal segment of the style minutely glandular, the terminal segment minutely pubescent; 2n=42. Moist woods and rocky ledges, sometimes weedy; Nf. and Lab. to Alas. and e. Asia, s. to Me., Vt., N.Y., Mich., Minn., and Calif. May–July. Var. perincisum (Rydb.) Raup, occurring from n. Mich. w. and n., has relatively strongly dissected lvs, the terminal lfl of the middle cauline ones 3-cleft nearly to the base with the lobes again cleft or laciniate. (G. oregonense) The widespread var. macrophyllum has less dissected lvs, the terminal lfl of the middle cauline ones 3-cleft to about the middle with the lobes merely toothed.
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Common Names
big-leaved avens