CCISTACEAE: Rockrose Family
KEY TO HUDSONIA SPECIES
1. Leaf blade 1-3(4) mm, closely appressed to twig, narrowly lance-ovate, linear-subulate, or awl-shaped, underside surface obscured or nearly so by dense mat of hairs....................H. tomentosa
1. Leaf blade 2-8 mm, erect to ascending or spreading, slenderly linear to linear-subulate or needle-shaped, greenish underside easily visible through the hairs ........................................ 2
2. Pith of twigs ca 0.1 mm across. Apex of sepals acute to rarely barely obtuse; ovary and fruit hairy beyond middle only ...................................... H. ericoides
2. Pith of twigs 0.15-0.5 mm across. Apex of shortest sepal acute, longest acuminate; ovary and fruit hairy from base to apex .........................H. montana