This cultivar is listed as triploid in the paper 'Pollen diameter and guard cell length as predictors of ploidy in diverse rose cultivars, species, and breeding lines'
The rose „Kleiner Alfred“ (Little Alfred) was named after Peter and Leonie‘s first son. It seems a little bit strange to me, that Peter Lambert named a rose after his bride, bred with a rose introduced some years later, named after his baby. I prefer the first parents as reported in Journal des Roses 1899, Aglaia X (Mignonette x Sh. Hibberd)
Léonie and Eugènie were daughters of Jean-Baptiste Lamesch, who had established a rose nursery in Dommeldingen, Luxembourg. So, it is another of those rose Family stories.
They went to St Petersburg for their honeymoon, and were invited by the Tsar to attend a court ball at The Hermitage, which was decorated with Lambert-bred roses. That's quite a compliment!
Research by a Heritage Roses in Aus member, who wrote a series on major 19th century rose breeders for our Journal. And I've just found it among the References! I should learn to look there first.
1916 The Rose Annual p109 Walter Easlea. Dwarf Polyantha Roses. ...and I have seen such a sort as Leonie Lamesch growing in an Essex garden 6-ft to 7-ft high.