| 1A. | Leaflets glabrous or slightly appressed—pubescent abaxially (underneath); minute purple glands absent on rachis and pinnae rachises | M. coulteri |
| 1B. | Leaflets glabrous or usually densely sparsely pubescent adaxially and abaxially; minute purple glands present on rachis and pinnae rachises | 2 |
| 2A. | Petiolar gland elevated, with bulbous apex; most leaves with 7 pairs of pinnae or fewer | M. mammifera |
| 2B. | Petiolar gland sessile, the apex irregularly elevated; most leaves with 10 or more pairs of pinnae | M. durangensis |
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