Clausen, Keck and Hiesey’s studies of clonal transplants during the 1930s and 1940s are famous for demonstrating ecotypic variation. Less appreciated are their studies on natural selection, even though at the time there was little hard evidence of its operation in nature. Here we present new analyses of their study of natural selection in Potentilla (Clausen et al., 1940; Clausen and Hiesey, 19...

The aerial parts of selected Potentilla species (P. anserina, P. argentea, P. erecta, P. fruticosa, P. grandiflora, P. nepalensis, P. norvegica, P. pensylvanica, P. crantzii and P. thuringiaca) were investigated in order to determine their contents of polyphenolic compounds. The results showed that P. fruticosa has relatively high concentrations of tannins (167.3 +/- 2.0 mg/g dw), proanthocyani...

Juniperus scopularum Sarg. (Rocky Mountain juniper) and Potentilla fruticosa L. ‘Gold Drop (gold drop po ten til la) plants grown in containers had sim i lar or bet ter morphology, higher nitrogen con cen tra tions and contents, and high er N-use ef ficien cy when grown with liquid fertilizer ap plied at an exponentially in creas ing rate as compared to the same amount of N applied via controll...