About Lindernia dubia (L.) Pennell
Lindernia dubia (L.) Pennell is a species of flowering plant, commonly called yellowseed false pimpernel and moist bank pimpernel. It is classified in the recently recognized plant family Linderniaceae, and is sometimes alternatively placed in the families Scrophulariaceae or Plantaginaceae. This species is native to a large portion of the Americas, ranging from Canada in the north to Chile in the south, and it now occurs as an introduced species on other continents. It grows in wet habitats, including riverbanks, pond margins, and meadows. It is an annual herb that produces a mostly erect, branching stem that grows to over 30 centimeters in height. Its leaves are arranged oppositely along the stem, and vary in size and shape: they may be lance-shaped to oval, with or without teeth, and range from under 1 centimeter to over 3 centimeters in length. Flowers grow out from the axils of the plant's upper leaves. Each flower has a calyx made up of five narrow, linear sepals. The tubular corolla is up to 1 centimeter long, white with a blue or purple tint, and has a lipped mouth; the lower lip has three rounded lobes. The fruit is a capsule that holds yellow seeds.
