This Larrea species is uncommonly (4 observations) represented in iNaturalist, in comparison with L. divaricata, L. cuneifolia, and L. nitida. This is despite records from Neuquén to Chubut provinces. The scarcity of pictures suggests that this Larrea species has very strict environmental needs.

This group of plants (pictures 14 and 15) were growing in the "ditch" on the south side of the highway Ruta 23. I think that this site will get flooded by runoff from the highway in times of rain. But for now the soil is dry and there are none of the plants, like sedges, that would be here if the area was underwater for long periods of time.

Unlike the other three species of Larrea that are upright shrubs, L. ameghinoi grows horizontally, and very close to the ground. The stems of the plant touch the ground (picture 12 and 13) and the leaf branches rise about 5 cm in height (picture 12). Pictures 6, 7, and 8 show how the main stem branches have a dense bark, and how the branches are truncated because the distance between the lateral leaf branches are comparably very short. This gives these branches a "banded" appearance.

There were no seed heads or flowers on the plants.

Pictures of most of the leaves show them to be spotted with what I think were tiny aphids. On the undersides of the leaves there is a thick, sticky secretion that in most of the pictures here has become filled with tiny pieces of rock (pictures 4, 10, and 11), and maybe, colonies of aphids. If there are aphids in here, they are too small to be seen in my pictures.