Glandularia tampensis (Tampa Vervain)

Native only to Florida, this perennial herb has sprawling, four-sided stems and opposite leaves with coarsely toothed margins. The leaves are dark green above and paler underneath, with pointed tips and bases that narrow into winged leaf stalks. Clusters of blue-purple flowers have long tubes and five spreading lobes. The surrounding calyx bears stiff hairs and bristly tips. Fruits divide into four pitted nutlets. The species grows in moist woodland openings, pine-palmetto flatwoods and disturbed sandy ground, flowering mainly in spring. It is listed as Endangered in Florida. Photographed in Florida.