Stephanomeria fluminea

Gottlieb

Madroño 46: 58, fig. 1. 1999.

Common names: Creekside wirelettuce
Treatment appears in FNA Volume 19. Treatment on page 355. Mentioned on page 350, 351, 352.
Revision as of 18:37, 24 September 2019 by FNA>Volume Importer

Perennials, 15–40 cm (rhizomes slender). Stems 1–8, branches ascending, ± tomentose. Leaves green (at least cauline) at flowering; blades oblong-oblanceolate, 3–6 cm, margins entire or toothed (teeth remote, faces tomentose). Heads borne singly or clustered along stems and branches. Peduncles 2–10 mm (glabrous). Calyculi of (4–6) appressed bractlets (unequal, lengths to 1/2 phyllaries). Involucres 8–10 mm (phyllaries 5, glabrous). Florets 5(–6). Cypselae tan, 4–4.4 mm, faces smooth, grooved; pappi of 30–40, white bristles (persistent), wholly plumose. 2n = 16.


Phenology: Flowering Jul–Aug.
Habitat: Spring-flooded flat, gravel stream beds. of conservation concern
Elevation: 2000–2300 m

Discussion

Of conservation concern.

Stephanomeria fluminea is known only from northwestern Wyoming. Its habitat is unique among all species of the genus. The plants grow on impermanent, raised cobble benches in flat, gravel beds of creeks that flood and churn after spring snowmelt.

Selected References

None.

Lower Taxa

None.