Annuals, 10–150 cm. Leaf-blades: bases ± clasping, faces usually both hirtellous to villous and ± glandular-viscid; proximal broadly spatulate to oblong, 20–50 × 10–20 mm, obscurely lobed or coarsely toothed; distal oblong to elliptic, 10–20 × 3–10 mm, coarsely toothed from near bases or entire. Heads in racemiform-paniculiform arrays. Involucres 2.5–3+ mm. Receptacles 2–3 mm diam. Pistillate florets 60–100+; corollas: lengths ± 1/2 styles, laminae 0. Disc-florets 5–20. Cypselae pale tan, 0.5–1 mm, glabrous or sparsely strigillose (hairs 0.05–0.1 mm), sometimes stipitate or sessile-glandular; pappi fragile or readily falling, of 10–30 whitish bristles in 1 series, (2.5–) 3.5–4 mm. 2n = 18.

Phenology: Flowering year round, mostly fall.
Habitat: Stream banks, roadsides, other disturbed sites, clays or sands, often alkaline soils
Elevation: -60–1800 m

Distribution

• Generated Map
• Legacy Map

Ariz., Calif., Colo., Nev., N.Mex., Tex., Utah, Mexico

Discussion

J. M. Kingsbury (1964) reported Laënnecia coulteri (as Conyza coulteri) to be toxic to livestock.

Selected References

None.

Lower Taxa

None.