Ammannia robusta
| Ammannia robusta | |
|---|---|
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Rosids |
| Order: | Myrtales |
| Family: | Lythraceae |
| Genus: | Ammannia |
| Species: | A. robusta |
| Binomial name | |
| Ammannia robusta Heer & Regel | |
| Synonyms | |
|
Ludwigia scabriuscula | |
Ammannia robusta is a species of flowering plant in the loosestrife family known by the common name grand redstem. It is native to most of western and central North America, where it grows in moist places, such as ditches and pond margins. It is an annual herb reaching about a metre in maximum height when growing erect. The leaves are up to 8 cm long and linear to lance-shaped. The leaves and stem are green to red in color. The inflorescences are clusters of up to five flowers in the leaf axils. The flowers are urn-shaped with light lavender petals about half a centimetre long and protruding stamens with yellow anthers. The fruit is a spherical capsule about half a centimetre wide containing several tiny seeds.