11. Amphiachyris. Heads small. Ray-flowers 5–10; pappus coroniform. Disk-flowers infertile; pappus of several bristle-like scales. Annual; leaves very narrow.
12. Grindelia. Heads large, many-flowered. Flowers all fertile. Pappus of 2–8 rigid caducous awns. Coarse herbs with toothed leaves.
[+][+] Pappus (at least of the disk) of copious slender or capillary bristles.
[=] Pappus double.
13. Heterotheca. Resembling Chrysopsis, but the achenes of the ray thicker than those of the disk and without pappus or nearly so. Western.
14. Chrysopsis. Heads many-flowered; rays numerous. The outer pappus of very small chaffy bristles, much shorter than the inner of copious capillary bristles.
[=][=] Pappus simple.
15. Aplopappus. Heads many-flowered, many-radiate. Involucre hemispherical. Pappus of many unequal bristles. Western.
16. Bigelovia. Heads 3–4-flowered; rays none. Receptacle awl-shaped. Pappus a single row of capillary bristles.
17. Solidago. Heads few–many-flowered; rays 1–16. Pappus of numerous slender and equal capillary bristles.