Coefficient of Conservatism:
Coefficient of Wetness:
R. W. Smith
Dunes, sandy bluffs, and shores; jack pine savanna, river banks, and borders of forests and thickets; rocky openings and outcrops; fields and fencerows. Plants with white flowers [f. alba (Erlanson) Fernald] are rarely found.
Hybrids with the hexaploid R. acicularis are noted under that species. Hybrids with R. palustris, also a diploid, are more frequent than those with R. acicularis and may be called R. ×palustriformis Rydb. In this hybrid, the influence of R. palustris is usually seen in finely serrate leaflets and, sometimes, in a glandular-hispid hypanthium, although the pedicel and hypanthium are usually smooth; the influence of R. blanda is seen in the smooth lateral shoots and the usual absence of stout curved infranodal prickles, although there are small internodal prickles. The hybrid flowers between the early-blooming R. blanda (peaking in June) and the late-blooming R. palustris (peaking in late July). (Rosa acicularis tends to flower in late May or early June, some days before R. blanda.)