| 1. Annual; lower cauline leaves short-petioled, generally 35-veined below middle |
| K. scoparia |
| 1' Perennial or subshrub; leaves sessile, vein 1 or obscure |
| |
| 2. Stems many from base, generally simple, glabrous to finely white-tomentose; leaves generally overlapping |
| K. americana |
| 2' Stems 1few from base, generally branched throughout, gray- to brown-puberulent; leaves not overlapping |
| K. californica
|