Coefficient of Conservatism:
Coefficient of Wetness:
A. A. Reznicek
Northern hardwoods, especially along borders, trails, clearings, and rivers; meadows and ditches.
The characteristic large cordate to reniform terminal segment of the basal leaves is a feature also sometimes occurring in G. aleppicum and G. rivale, both of which are therefore sometimes confused with G. macrophyllum. The head of achenes in G. rivale is elevated on a stalk, and the beak is conspicuously hairy though it may also be glandular; in G. macrophyllum the receptacle is essentially sessile, and the beak is only glandular-puberulent. The beak of G. aleppicum has only a few long hairs at its base. Both may have pilose achene bodies. Plants with the leaflets of the basal (and other) leaves incised, with ± cuneate segments, have been called G. macrophyllum var. perincisum (Rydb.) Raup.
A Dodge collection, June 12 1916, in BLH, is labeled "Vicinity of Port Huron," but Dodge's own herbarium at MICH contains a June 12, 1916 collection from Ontario by N. Tripp, and the BLH sheet is likely a mislabeled duplicate of this.