Epilobium coloratum Biehler

Epilobium coloratum plant

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 stemStem.

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

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 flowerFlower.

Epilobium coloratum calyxCalyx.

Epilobium coloratum fruitDeveloping fruit.

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.


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