Here are some pictures of mine (obviously not taken recently, since they're under 2 ft. of snow!)
s. globiferum subsp. hirtum 'Emerald Spring'
s. globiferum subsp. globiferum 'Madame Lorene' - This one gets pretty large for a roller, up to 3" diameter.
s. globiferum subsp. hirtum 'Astrid'
s. globiferum subsp. hirtum 'from Baba Mare'
s. globiferum subsp. pressianum 'from Belianske Tatras'
