rochalita's Identifications

There are mixed populations of white (Erythronium albidum) and yellow (E. americanum) trout lilies around the main building at NKU's field station (REFS). While I was trying to capture both species in one photo and maybe get a few good single flower shots, too, I made an exciting discovery: Yellow trout lilies are polymorphic! I mostly saw plants with yellow anthers and pollen, but a couple had flowers with bold red anthers and dark orange pollen instead.

Surely someone else has noticed this before and been curious? A quick literature search, and yes:
Austen, Emily J., Shang‐Yao Lin, and Jessica RK Forrest. "On the ecological significance of pollen color: a case study in American trout lily (Erythronium americanum)." Ecology 99.4 (2018): 926-937.

Very cool.