| | 1. Ray flowers 4–8, pale yellow; involucre generally 4–6 mm diam; heads 2–3 |
| B. pauciradiata |
| | 1' Ray flowers 15–many, bright yellow; involucre 10+ mm diam; heads solitary |
| |
| | 2. Ligules 10–20 mm, widely linear or oblong, prominently 3-lobed; fruit cylindric or barely angled; ribs ± equal; peduncles generally 10–20+ cm, ± scape-like |
| B. multiradiata var. multiradiata |
| | 2' Ligules 6–10 mm, widely elliptic to obovate, shallowly 3-lobed to truncate; fruit ribbed and angled; ribs of angles most prominent; peduncles generally 3–10 cm, generally leafy-bracted |
| B. pleniradiata
|