| Its horns are of the lyrate form, and its colour a bright rufous. |
| The male differs greatly from the female in colour, and in the form of its tail, which is lyrate, or has the outer feathers longer and curved outwards. |
| The impalla is about the same size as the Grant's gazelle, but has horns of a lyrate shape. |
| The patterning on the back is lyrate with small orange-capped warts. |
| The lowest leaves are not entire, but lyrate and pinnatified below to the mid-rib, with a terminal lobe. |
| The posterior canal is slightly developed and the lip is lyrate within. |
