Planting dates, pollen source and pollen recipient areas, and geographic coordinates of each study site.

<p>¹ m/d/y = month/day/year.</p><p>² Experimental trials.</p><p>³Pilot trials.</p><p>Planting dates, pollen source and pollen recipient areas, and geographic coordinates of each study site.</p

Modeled outcrossing rates (%) per site as a function of distance (m).

<p>Note the site-specific equations for predicting outcrossing are shown in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0131549#pone.0131549.t005" target="_blank">Table 5</a>.</p

Site-specific equations for predicting outcrossing rates based on model (1).

<p>Site-specific equations for predicting outcrossing rates based on model (1).</p

Predicted outcrossing rates (%) for distances beyond 25 m.

<p>Predicted outcrossing rates (%) for distances beyond 25 m.</p

Observed and predicted outcrossing rates (%) across sites as a function of distance (m).

<p>Observed values (circles) and predicted values (line) based on model (1) with 95% confidence interval (shaded region).</p

Field layout.

<p>(a) An aerial photograph from one of the sites (La Bombas, Chihuahua) and (b) Graphic representation of field layout used across sites to measure outcrossing rates (%) as a function of distance (m).</p