Verbena hastata L. - Blue Vervain
Family - Verbenaceae
Stems - To 1.6m tall, branched above, herbaceous, pubescent, often slightly scabrous, 4-angled.
Stem at a node.
Leaves - Opposite, petiolate, lanceolate to lanceolate-oblong or lanceolate-ovate, to +/-3cm broad, +15cm long, serrate to double serrate, scabrous above, pubescent below.
Inflorescence - Multiple terminal spikes, with flowers dense and overlapping, indeterminate.
Single spike of inflorescence.
Flowers - Corolla whitish to blue-purple or rose, to 10mm long, 4mm wide at apex, tubular, salverform, 5-lobed, zygomorphic. Stamens 5, included within corolla. Calyx to 3mm long, tubular, pubescent, 5-lobed(toothed).
Flowering - June - October.
Habitat - Moist ground, waste ground, pastures, thickets, meadows, streambanks, roadsides, railroads.
Origin - Native to U.S.
Other info. - This plant
is sometimes confused with V. urticifolia L. but the
latter has flowers which are not as dense on the spikes and with corollas
which are typically white. V. urticifolia also has
much broader leaves than does V. hastata.
Photographs taken off Shaw Ave., St. Louis, MO., 7-28-03.