Patersonia sericea
| Purple flag | |
|---|---|
| Scientific classification | |
| Kingdom: | Plantae | 
| Clade: | Tracheophytes | 
| Clade: | Angiosperms | 
| Clade: | Monocots | 
| Order: | Asparagales | 
| Family: | Iridaceae | 
| Genus: | Patersonia | 
| Species: | P. sericea | 
| Binomial name | |
| Patersonia sericea | |
| Synonyms | |
| 
 | |
Patersonia sericea, commonly known as purple flag or silky purple-flag is a species of plant in the iris family Iridaceae and is endemic to eastern Australia. It is a densely-tufted perennial herb with linear, sword-shaped leaves, broadly egg-shaped, bluish-violet tepals and an oval capsule.