4 favorite votes.  

Red blend Shrub.
Registration name: Kathrinerl

Bred by Hans Jürgen Weihrauch (Germany, before 1990).

Shrub.  

Red blend.  None / no fragrance.  12 to 16 petals.  Semi-double (9-16 petals), flat bloom form.  Spring or summer flush with scattered later bloom.  

Medium.  

USDA zone 6b through 9b (default).  Disease susceptibility: susceptible to blackspot , very mildew resistant.  Remove spent blooms to encourage re-bloom.  Spring Pruning: Remove old canes and dead or diseased wood and cut back canes that cross. In warmer climates, cut back the remaining canes by about one-third. In colder areas, you'll probably find you'll have to prune a little more than that.  

FROM FRED BOUTIN, 3-06: Erich Unmuth tells me that 'Kathrinerl' was raised by Mr. Jürgen Weihrauch, of Bad Nauheim, Germany. It was evidently never registered or introduced because of its susceptibility to black spot after the first flush of blooms. Weihrauch shared it with Erich because of the 'Gruss and Teplitz' ancestry and their mutual interest in Geschwind roses. Erich tells me that Weihrauch did a lot of breeding with several Geschwind roses.
I got it from Bill in 1992, so the share/distribution started sometime before that. And the name is 'Kathrinerl'.

JJ: This rose appears to have real value in a dry coastal situation. It is wholly resistant to the common fungal problems here (powdery mildew, rust, downy mildew). (See above, it is said to be susceptible to blackspot).
The bloom color is rich, with a smokey black "overlay," and the bright-gold stamens add interest to the dark bloom. The foliage is a particularly attractive medium-green with a slight blue-ish cast. In my garden, blooms are BARELY semi-double (more like 10 petals), about the size of a 50-cent-piece, and held in small sprays. Canes are graceful and arching. Some canes here have gone up high enough to grab R. banksiae banksiae, and are now nodding, about 5 ft. up. 'Katrinerl' seems tolerant of open shade. Bloom production increases steadily, as the plant matures.
This is a striking and valuable garden rose, where blackspot is not a major issue.
'Gruss an Teplitz' mildews in my garden.
Kathrinerl does not.
Jeri Jennings, Camarillo (Ventura County) California 3-22-06