Verbena canadensis (L.) Britt. - Rose Verbena

Verbena canadensis plant

Family - Verbenaceae

Stems - Multiple from the base, from a woody caudex and fibrous roots, erect to ascending, herbaceous, to 30cm tall, typically simple, 4-angled, villous.

Verbena canadensis stem

Leaves - Opposite, petiolate, decussate. Petioles to -2cm long, often with decurrent leaf tissue, villous. Blades to +3cm long and broad, ovate, pinnatifid, pubescent. Ultimate divisions acute.

Verbena canadensis leaves

Inflorescence - Terminal compact spike, appearing cymose in flower. Each flower subtended by a single bract. Bracts villous, lanceolate-attenuate, to 9mm long, 2mm broad.

Verbena canadensis inflorescence

Flowers - Corolla zygomorphic, salverform, purplish. Corolla tube to 2cm long, glandular pubescent externally, villous internally and floccose near apex. Corolla lobes 5, to 7mm long, +5mm broad, typically emarginate, glabrous. Stamens 4, didynamous, adnate near the middle of the corolla tube, included. Filaments white, to 1mm long, glabrous. Anthers greenish, .7mm long. Style to 1.7cm long, glabrous, greenish-white, included. Stigma unequally 2-lobed. Ovary green, glabrous, 4-lobed, .7mm long. Calyx tube 8mm long, 1.5mm in diameter, villous and glandular pubescent externally, pubescent internally, unequally 5-lobed. Lobes purplish, attenuate, to +2mm long, pubescent as calyx tube.

Verbena canadensis calicesCalices.

Verbena canadensis flower

Flowering - March - November.

Habitat - Glades, rocky woods, bluffs, gravel bars, prairies, roadsides, railroads.

Origin - Native to U.S.

Other info. - This striking plant is found mostly in the lower 2/3 of Missouri. The typical flower color is shown above but whitish and reddish flowers are found also. This species is very tolerant of dry conditions and does well in cultivation. The plant also grows well from seed.
A synonym is Glandularia canadensis (L.) Nutt..

Photographs taken near Chilton Creek, Carter County, MO., 8-29-03.


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