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'Steppe-tundra' is a sparse dry-climate vegetation type was widespread during Pleistocene times at mid-latitudes of North America and Eurasia, but no longer exist today. The characteristics of steppe-tundra are inferred indirectly from knowledge of the habitat preferences of the individual plant species that were present in this vegetation, and from related zoological and sedimentological evidence.^[1]
The terms steppe and tundra tend to imply a dense sward with organic-rich soils, and so in this sense the term is misleading. For convenience, the steppe-tundra can be divided into two types, a more 'steppe-like' variant and a more 'tundra-like' variant.
For the tundra-like vegetation, analogies have been drawn with a treeless vegetation that presently occurs in scattered patches on well drained south-facing hillslopes in north-eastern Siberia, although the modern-day equivalent is thought to have too dense a ground cover of vegetation.^[2] Ground cover amounted to no more than about 50%, with mainly herbaceous plants but a few scattered low shrubs and occasional stunted trees in sheltered spots. Peat accumulation would have been negligible, and the soil would have had a much lower organic content than most present-day tundra.
The more steppe-like variant, containing a higher proportion of steppic species, would seem if anything to have had an even sparser vegetation cover. The best analogy would be with semi-desert transitional steppes that occur today at the northern fringes of the central Asian desert.
The steppe-tundra supported grazing megafauna such as bison, horses, and mammoths.

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References

1. Steppe-tundra
2. Late Quaternary Environments of the Soviet Union, , N.A., Khotinsky, , ,

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★ Possible link between steppe-tundra habitat and human eye, skin and hair color