Geographic Variation in Flower Size and Flower-Visitor Composition of Two Bumblebee-Pollinated, Spring-Flowering Herbs, &amp;lt;i&amp;gt;Lamium album&amp;lt;/i&amp;gt; L. var. &amp;lt;i&amp;gt;barbatum&amp;lt;/i&amp;gt; (Lamiaceae) and &amp;lt;i&a

Geographic Variation in Flower Size and Flower-Visitor Composition of Two Bumblebee-Pollinated, Spring-Flowering Herbs, <i>Lamium album</i> L. var. <i>barbatum</i> (Lamiaceae) and <i&a

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scientific article published in 2015