Epilobium coloratum Biehler

Purple-Leaved Willow Herb

Epilobium_coloratum_plant.jpg
STATS

Native
CC = 6
CW = -5
MOC = 54

© DETenaglia

Family - Onagraceae

Stems - To +1m tall, erect, herbaceous, terete to 4-angled with rounded angles, sub-hollow, glabrous or with thin vertical lines of antrorse curled hairs, single from the base, widely branching in apical half, often reddish at nodes.

Epilobium_coloratum_stem.jpg Stem.

© DETenaglia

Leaves - Stem leaves opposite, short-petiolate. Petioles to 1cm long, with a few strigose hairs on the margins. Blades glabrous, lanceolate, serrate, with antrorse strigose hairs on the margins. Midrib and lateral veins impressed adaxially, expressed abaxially, to +/-10cm long, 2cm broad, typically rounded at the base.

Epilobium_coloratum_leaf.jpg

© DETenaglia

Inflorescence - Terminal bracteate panicles. Bracts foliaceous, reduced upward. Branches of inflorescence alternate, straight and antrorse-curled pubescent. Pedicels pubescent like the branches of inflorescence, to 3-4mm long in flower, elongating in fruit to 1cm long.

Flowers - Petals 4, white to pinkish, 3-5mm long, 2-3mm broad, glabrous, 2-lobed at apex, obovate to elliptic, distinct. Stamens 8, 4 being longer than the others, alternating with the petals, erect. Filaments to 2mm long, white, glabrous. Anthers pink, .2-.3mm in diameter. Stigma capitate, 1mm long, pale yellow. Style 1.5mm long, thicker than the filaments, glabrous. Calyx 4-lobed. Calyx tube to 1mm long. Lobes to 2-3mm long, 1-1.5mm broad, acute to acuminate or apiculate, entire, pubescent (curled and straight) externally, glabrous internally. Calyx tube with a few hairs internally. Ovary inferior, 6-13mm long in flower, antrorse and straight pubescent, 1mm broad, 4-angled (the angles rounded). Ovules many. Fruits to 6cm long, 1.3mm broad. Seeds to 2mm long, .5mm broad, brown, comose. The hairs to 1cm long, whitish brown to cinnamon.

Epilobium_coloratum_flower.jpg Flower.

© DETenaglia

Epilobium_coloratum_calyx.jpg Calyx.

© DETenaglia

Epilobium_coloratum_fruit.jpg Developing fruit.

© DETenaglia

Flowering - July - October.

Habitat - Wet ground.

Origin - Native to U.S.

Other info. - This species is common and can be found throughout Missouri. The plant is fairly easy to ID because of its habitat, opposite stem leaves and small whitish-pink flowers. Of the two species of Epilobium in Missouri, this species is much more frequent.

Photographs taken in Brown Summit, NC., 9-20-02.