Magazine  (1906)  Page(s) 300.  
 
Subspec. nigritella. Branches densely covered with dark pedicelled glands and bristles, peduncles and receptacles with short, dark pedicelled glands. Fruit globular, blackish red. True to seed. I saw this form cultivated in Kew, have also grown it for several years and used it in my crossings. The leaflets are a little more acuminate than the typical R. sericea. Similar variations in the amount of pedicelled glands is also seen with R. Fedtschenkoana Rgl.
From my crossings with Rosa sericea nigritella have those with R. rubiginosa and R. tomentosa already bloomed...