Fritillaria sewerzowii
Also published as Korolkowia sewerzowii. You are in the right place.

About the plant
What it is and where it grows — not part of any germination protocol.
- Native range
- Kazakhstan, Kirgizstan, Tadzhikistan, Uzbekistan
Toxicity is noted only where a source states it. No note here is not a finding of safety.
Source: GBIF Backbone Taxonomy — Global Biodiversity Information Facility.
Protocol
DerivedN. C. Deno, 1993Difficulty Moderate
Sow outdoors and leave it
Up in April, more than a year after it went out.
No stated waiting before sowing. Germination time not stated; 21 days assumed.
Deno gives no count and no temperature -- only that it takes more than a year.
This source doesn't state how long.