The False Pimpernel of the Columbia River Gorge of Oregon and Washington

Common False Pimpernel, Yellowseed False Pimpernel

Lindernia dubia var. dubia

Synonyms: Gratiola dubia, Ilysanthes attenuata, Ilysanthes dubia, Lindernia dubia var. dubia, Lindernia dubia var. inundata, Lindernia dubia var. major, Lindernia dubia var. riparia, Lindernia dubia var. typica, Lindernia procumbens, Lindernia pyxidaria)

Common False Pimpernel, Yellowseed False Pimpernel: Lindernia dubia var. dubia (Synonyms: Gratiola dubia, Ilysanthes attenuata, Ilysanthes dubia, Lindernia dubia var. dubia, Lindernia dubia var. inundata, Lindernia dubia var. major, Lindernia dubia var. riparia, Lindernia dubia var. typica, Lindernia procumbens, Lindernia pyxidaria)

The photo above shows a close-up of the flower of common false pimpernel as seen on the shore of the Columbia River at Dalton Point.....................September 1, 2007. Note the teeth along the margins of each leaf.

Common False Pimpernel, Yellowseed False Pimpernel: Lindernia dubia var. dubia (Synonyms: Gratiola dubia, Ilysanthes attenuata, Ilysanthes dubia, Lindernia dubia var. dubia, Lindernia dubia var. inundata, Lindernia dubia var. major, Lindernia dubia var. riparia, Lindernia dubia var. typica, Lindernia procumbens, Lindernia pyxidaria)The photo at right shows common false pimpernel as seen on the shore of the Columbia River at Dalton Point.....................September 1, 2007. Note that the pedicels are slightly shorter than the subtending leaves.
Characteristics:

As evidenced by the photo below, common false pimpernel is a low, branching annual with lax stems. The stems range from 5 to 20 cm in length. The leaves are all on the stems and are mostly entire to occasionally with small teeth. The leaves are up to 3 cm in length with the leaves narrowed gradually to the base.

The flowers are typically solitary within the leaf axils. The flowers are tubular with the 5 lobes at the mouth forming two lips. The corolla ranges from 7-10 mm in length. The flower stalks range from 5-15 mm long.

Lindernia dubia differs from its cousin, Lindernia anagallidea in having larger flowers but shorter flower stalks. In the former species, the pedicels are equal to or only slightly surpass the subtending leaves, while the latter species has all but the lowest flower pedicels noticably surpassing the subtending leaves. The former species usually has larger leaves, while the latter species has leaves from 6-15 mm long that are mostly broadly rounded at the base.


Habitat:

Common false pimpernel is common along the mudflats and bottomlands of the Columbia River and into the mouths of the larger rivers running into it.


Range:

Common false pimpernel is common in the easern and central United States. It is also found into South America. It is evidently rarer in the west, to which it may be an introduced species.

In the Columbia River Gorge, it may be found at river level from east of Troutdale, OR east to the Deschutes River.


Common False Pimpernel, Yellowseed False Pimpernel: Lindernia dubia var. dubia (Synonyms: Gratiola dubia, Ilysanthes attenuata, Ilysanthes dubia, Lindernia dubia var. dubia, Lindernia dubia var. inundata, Lindernia dubia var. major, Lindernia dubia var. riparia, Lindernia dubia var. typica, Lindernia procumbens, Lindernia pyxidaria)

The photo above shows a close-up of common false pimpernel as seen on the shore of the Columbia River at Dalton Point.....................September 1, 2007.

Common False Pimpernel, Yellowseed False Pimpernel: Lindernia dubia var. dubia (Synonyms: Gratiola dubia, Ilysanthes attenuata, Ilysanthes dubia, Lindernia dubia var. dubia, Lindernia dubia var. inundata, Lindernia dubia var. major, Lindernia dubia var. riparia, Lindernia dubia var. typica, Lindernia procumbens, Lindernia pyxidaria)

Close-up of a stem leaf and flower of common false pimpernel as seen on a sandy shoreline of the Klickitat River about 6 miles north of the WA 147 bridge over the Klickitat River...................July 21, 2011.

Common False Pimpernel, Yellowseed False Pimpernel: Lindernia dubia var. dubia (Synonyms: Gratiola dubia, Ilysanthes attenuata, Ilysanthes dubia, Lindernia dubia var. dubia, Lindernia dubia var. inundata, Lindernia dubia var. major, Lindernia dubia var. riparia, Lindernia dubia var. typica, Lindernia procumbens, Lindernia pyxidaria)

Common false pimpernel as seen along the west bank of the Deschutes River about one half mile upstream from the Columbia River................July 27, 2011.

Common False Pimpernel, Yellowseed False Pimpernel: Lindernia dubia var. dubia (Synonyms: Gratiola dubia, Ilysanthes attenuata, Ilysanthes dubia, Lindernia dubia var. dubia, Lindernia dubia var. inundata, Lindernia dubia var. major, Lindernia dubia var. riparia, Lindernia dubia var. typica, Lindernia procumbens, Lindernia pyxidaria)

The photo above shows a close-up of the flower of common false pimpernel as seen on the shore of the Columbia River at Dalton Point.....................September 1, 2007.

Close-up of the leaves of Common False Pimpernel, Yellowseed False Pimpernel: Lindernia dubia var. dubia (Synonyms: Gratiola dubia, Ilysanthes attenuata, Ilysanthes dubia, Lindernia dubia var. dubia, Lindernia dubia var. inundata, Lindernia dubia var. major, Lindernia dubia var. riparia, Lindernia dubia var. typica, Lindernia procumbens, Lindernia pyxidaria) - Common False Pimpernel, Yellowseed False Pimpernel: Lindernia dubia var. dubia (Synonyms: Gratiola dubia, Ilysanthes attenuata, Ilysanthes dubia, Lindernia dubia var. dubia, Lindernia dubia var. inundata, Lindernia dubia var. major, Lindernia dubia var. riparia, Lindernia dubia var. typica, Lindernia procumbens, Lindernia pyxidaria) - Flower and upper stem leaves of Common False Pimpernel, Yellowseed False Pimpernel: Lindernia dubia var. dubia (Synonyms: Gratiola dubia, Ilysanthes attenuata, Ilysanthes dubia, Lindernia dubia var. dubia, Lindernia dubia var. inundata, Lindernia dubia var. major, Lindernia dubia var. riparia, Lindernia dubia var. typica, Lindernia procumbens, Lindernia pyxidaria)

Additional close-ups of common false pimpernel as seen along the Columbia River shoreline at the Dalles Riverside Park..............October 12, 2011.

Common False Pimpernel, Yellowseed False Pimpernel: Lindernia dubia var. dubia (Synonyms: Gratiola dubia, Ilysanthes attenuata, Ilysanthes dubia, Lindernia dubia var. dubia, Lindernia dubia var. inundata, Lindernia dubia var. major, Lindernia dubia var. riparia, Lindernia dubia var. typica, Lindernia procumbens, Lindernia pyxidaria)

Common false pimpernel as photographed along the west bank of the Deschutes River at its mouth............September 3, 2000.

Paul Slichter