| | 1. Fruit glabrous; leaf linear to narrowly oblanceolate; pedicel ascending-spreading |
| A. desertorum |
| | 1' Fruit hairs dense; leaf narrowly oblanceolate to obovate; pedicel spreading (sometimes ascending in A. alyssoides) |
| |
| | 2. Sepals persistent in fruit; filaments not winged, not appendaged |
| A. alyssoides |
| | 2' Sepals shed early; filaments winged, appendaged |
| |
| | 3. Fruit hairs of ± 1 kind (coarse, stellate, not appressed) |
| A. minus var. micranthum |
| | 3' Fruit hairs of 2 kinds (stiff, spreading, once-forked and smaller, stellate, appressed) |
| A. strigosum
|