Impatiens pallida

Native

Moist. Woods, forests, meadows, stream banks. Light shade to partial sun.

July to September

Yellow

2′ to 6′

This is a 2′ to 6′ tall, erect, annual forb that rises from a shallow, branching taproot. It often forms colonies

The stems are erect, hairless, branched above the middle, light green, and translucent. They are succulent, hollow, and easily broken. They are often covered with a whitish, waxy coating (glaucous).

The leaves are alternate, egg-shaped or elliptic, and thin. They are 1″ to 4″ long and up to 2″ wide, less than 3 times longer than wide. They are on leaf stalks up to 2″ long, the stalk usually shorter than the blade. The upper surface is blue-green or glaucous and hairless. The lower surface is hairless. The margins have rounded, forward-pointing teeth. The teeth are tipped with a short, sharp, whitish, abrupt point. The leaves on flowering branches are usually more than 3⅛″ long.

The inflorescence is a widely-spreading cluster of 1 to 3 flowers rising from the upper leaf axils. The flowers are held horizontally on ¾″ to 1⅛″ long, drooping stalks.

The flowers are 1″ to 1½″ long. There are 3 petal-like sepals and 5 petals. The upper 2 sepals are yellow, small, and located behind the upper lip. The lower sepal is yellow. It is modified to form a bowl-shaped tube ending in a narrow nectar spur. The bowl-shaped portion of the sepal is about as long as it is wide. The spur is ⅛″ to ¼″ long, hairless, and is held at a right angle to the flower body, pointing downward.

The petals are yellow and often dotted with reddish-brown. One petal forms the upper lip. It is short and wide and curves upward. The four remaining petals are fused in pairs to form two lobed, lateral petals. The lobes of these petals spread outwards forming a pair of landing pads for pollinating insects. Near the upper lip are are 5 stamens fused together forming a cap over the pistil. There is no floral scent.

The fruit is a slender, hairless, 5-valved capsule about ¾″ long. When ripe it explodes if touched or jarred, releasing its seeds.

Spotted touch-me-not (Impatiens capensis) is usually a smaller plant. The leaves on flowering branches are no more than 3⅛″ long. The flowers are smaller, ¾″ to 1⅛″ long, and are orange. The tube formed by the lower sepal is longer and cone-shaped, longer than wide. The spur is longer, ¼″ to ⅜″ long, and is curved forward and held close to the body of the flower. The petals are orange. It is more common than pale touch-me-not and is found in sunnier, more open locations.