To investigate the likelihood that Hesperis matronalis would move into similar established communities, we set up disturbance treatments in each of 12 replicate plots (2 m x 4 m rectangles) for each of the four combinations of nitrogen supply and water supply (splitplot design, Fig.
The neighbor absent treatment consisted of a Hesperis matronalis transplant grown in the center of each subplot among existing residents that were clipped once a week.
We recorded non-destructive measurements of Hesperis matronalis every 3 wk to estimate biomass and harvested plants after 12 wk to directly assess aboveground biomass.
Neighbor presence/absence was the single most decisive determinant of Hesperis matronalis aboveground biomass and RGR (Fig.
Hesperis matronalis seedlings grew only in disturbed areas with minimal competition.
Results for Hesperis matronalis parallel those for P.
For Hesperis matronalis, we found that although flower morphology varies significantly among color morphs (by ~7%), there is no difference among morphs in seed or fruit set.
Hesperis matronalis was apparently introduced many years previously to a homesite nearby.
For Hesperis matronalis, cover in both the control and treatment plots was determined before the current season's plants were pulled.
Thus, we examined how total vegetation cover, litter, bare ground and cover of Hesperis matronalis changed across seasons and years.
001) and exotic forbs, exclusive of Hesperis matronalis (r = -0.
is a growing problem in the floodplain woods along Culmer's Run on the east side.