Poteridium annuum
Rosaceae
Western Burnet
Stem ascending. Basal leaves withered by bloom time; stem leaves 1–5 in. long, divided pinnately. Leaflets 9–17, sessile, oval, deeply lobed, with linear segments. Flower spikes at branch tips barrel-shaped with greenish white flowers, petals lacking, 4 sepals shorter than the 2 well-exserted stamens. Grows in open areas, especially on disturbed soils. Similar S. canadensis is 10–40 in., with toothed rather than lobed leaflets, and greenish to yellowish white flowers in cylindrical spikes; grows in bogs, wet places.
- Rarity: Locally Common
- Flowering Time: Late Spring, Early Summer
- Flower Form: Petals Absent or Not Apparent
- Life Cycle: Annual, Perennial
- Height: 4–25 inches
- Habitat: Bog/Fen/Wetland, Disturbed, East-side Forest, Meadow, West-side Forest
- Found In: N Cascades NP, Siskiyous, Wallowas
- Native: Yes
- Latin Synonyms: Poteridium occidentale, Sanguisorba annua
