| |
| B. tripartita |
| |
| 3. Fruit with ± thickened margin, prominently ribbed; tips of chaff scales yellow; ligules 0 or < 15 mm |
| B. cernua var. cernua |
| 3' Fruit flat, without thick margin or prominent ribs; tips of chaff scales reddish; ligules 1530 mm |
| B. laevis |
| 1' Leaves pinnately compound |
| |
| 4. Fruit narrow, ± cylindric |
| B. pilosa var. pilosa |
| 4' Fruit wedge-shaped, flat |
| |
| 5. Outer phyllaries 58; inner phyllaries = disk; fruit ± black |
| B. frondosa |
| 5' Outer phyllaries 1016; inner phyllaries < disk; fruit brown or dark green |
| B. vulgata
|