Rhodiola roseroot
See also Sedum, often considered a (senior) synonym of Rhodiola.
Dichotomous table for leafminers
1a larvae with thoracic feet and recognisable head; older larvae live free, in a web => 2
1b larvae without feet, no recognisable head; they mine until just before pupation => 3
1c galls, etc => Tables for all parasites per species
2a several small galleries in a leaf: Yponomeuta sedella
2b a single blotch: Cnephasia sedana
3a larva: both rear spiracula fused into a strongly chitinised respiratory tube => 4
3b rear spiracula free from each other => 5
4a respiratory tube with 5 + 5 openings: Cheilosia rhodiolae
4b respiratory tube with 3 + 3 openings: Cheilosia semifasciata (occurrence on this hostplant improbable)
5a rear spiracula of larva and pupa strikingly forked: Phytomyza rhodiolae
5b rear spiracula not strongly bifid: Phytomyza sedicola