Botanical names can be confusing. Gaura was listed as Gaura longiflora and Gaura biensis. These were combined in the new volumes of Flora of Missouri by Dr. Yatskievych so the same plants are now Oenothera filiformis.
This confusion can make people dislike using scientific names. I prefer using these as each name refers to a particular kind of plant. Plants can have more than one common name. Or a single common name can refer to more than one plant.
Yes, I still refer to most plants by their common names when talking to other people. It makes conversation easier.
Oenothera filiformis W.L. Wagner & Hoch
June to October N Family: Onagraceae
Flower: Loose groups of flowers tip the branches and arise at leaf nodes. Each flower has four upright petals with a long pistil swooping down from them flanked by four stamens on each side. A fresh flower is usually pink tinged white and turns darker pink as it ages over the day. Two pink sepals sweep back from the flower. The long flower stalk is a cylindrical ovary with a green lower section and pink upper section.
Leaf: The basal leaf rosette can be the first year’s growth or beginning of the year’s growth. It may or may not be present when the plant blooms. The stem leaves are alternate with a short, winged petiole. Small leaves can grow at the base of the petiole. Each leaf is long flaring out to the middle then tapering to a point. The wavy edges are irregular but not lobed or toothed. There is a single midvein. Top and bottom of the leaf is green, slick-looking and covered with short hairs.
Stem: One or several slender, green, hairy stems come up from the root then branch repeatedly forming a wide, leggy bush reaching five feet or more in height.
Root: The fleshy root can be annual or biennial.
Fruit: A long tube with tapered, rounded tip.
Habitat: This plant likes sunny locations favoring pastures, glades, roadsides and open, disturbed areas.
Large Flowered Gaura
Gaura is tall and leggy. It looks like a coordinated structure of slender, green sticks with handfuls of flowers glued on here and there. These sway in any breath of wind.
The flowers are easily recognizable with their four petals sticking up like the ribs for a fan. They fade by noon turning deep pink and folding themselves along the developing seed pod.
Although the plants grow in a variety of sunny places, I see them commonly along the roads. The leggy bushes are easy to recognize. The flowers are smaller and must be seen from closer up.
The seed pods are colorful as they develop. They turn brown when mature. The plant seeds freely.