Verbena L.

Plants erect not rooting at nodes Verbena
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Leaves sessile, often stem-clasping, coarsely serrate, 3–18 cm long. Spikes dense both in flower and fruit. Scabrous to hairy perennials
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Bracts not or only slightly longer than the calyx; corolla tube twice as long as calyx
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Spikes sub-cylindrical. Peduncles without glandular hairs. Corolla tube rarely twice as long as calyx. Stems scabrous pubescent. Leaves ovate-lanceolate. Perennial or annual herb to 2 m high. Widespread. Weed of cultivation and waste places. Introd. from S. America. Fl. spring–autumn. Purple Top Verbena bonariensisbonariensis
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Spikes in capitate clusters. Peduncles with glandular hairs. Corolla tube mostly twice as long as calyx. Leaves ovate-lanceolate. Perennial or annual herb to 2 m high. Widespread. Weed of cultivation and waste places. Introd. from S. America. Fl. spring–autumn. Purple Top Verbena bonariensisconglomerata