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Narrow-Leaved Vervain can be distinguished from other Verbena spp. by its narrow leaves (less than ½" across) and long slender spikes of flowers (actually, spike-like racemes because the flowers have short pedicels). Its flowers are smaller in size than those of Verbena stricta (Hoary Vervain), but larger in size than other Verbena spp. within the state. This comparison excludes Rose Vervain, which has been reassigned to a different genus (Glandularia). Narrow-Leaved Vervain can form hybrids with other species in its genus. Two of these hybrids have been found within the state


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© John Hilty

Source: Illinois Wildflowers

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