There is no glanduliferum in cultivation. Nothing being grown matches the original description and type, according to a thorough analysis by Eric C. a few years back.
What has been grown as glanduliferum has been praestans, so that's probably what you have.
Then there's the Kew Monocot checklist, a noble attempt. They show both praestans and gardineri as later synonyms of glanduliferum (1894 v. 1892). Wilhelminiae is shown as a separate species. I have several plants of both "praestans" and wilhelminiae and adore them.