J. Amer. Soc. Hort. Sci. 131(1): 66-73 (2006)
Characterization and Genetic Relationships of Wild Species and Old Garden Roses Based on Microsatellite Analysis
Valentina Scariot, Aziz Akkak, and Roberto Botto
Two cases of uncertain attribution to these sections were examined: 'Andrewsii', considered belonging either to the section Pimpinellifoliae (Beals, 1985) or to the section Rosa, Moss group (Beales et al., 1998), was genetically closer to Pimpinellifoliae; ...

The Rose-Amateur's Guide (1843) pp.102-103
Thomas Rivers
About four years since, in a pan of seedling Moss Roses, was one with a most peculiar habit, even when very young; this has since proved a hybrid rose, partaking much more of the Scotch Rose than of any other, and till the plant arrived at full growth I thought it a Scotch Rose, the seed of which had by accident been mixed with that of the Moss Rose, although I had taken extreme care: to my surprise it has since proved a perfect hybrid, having the sepals and the fruit of the Provence Rose, with the spiny and dwarf habit of the Scotch Rose; it bears abundance of hips, which are all abortive.* The difference in the fruit of the Moss and Provence Roses and that of the Scotch is very remarkable, and this it was which drew my particular attention to the plant in question; it was raised from the same seed, and in the same seed-pan, as the Single Crimson Moss Rose: as this strange hybrid came from a Moss Rose accidentally fertilised, we may expect that art will do much more for us.

Maybe this 'Andrewsii' is a hybrid rather than a sport.