Here's a shot of Erythronium grandiflora, or glacier lily, growing in Jefferson Market. This is a new plant for me. I noticed it growing in the southeast corner of the park
Erythronium is a Liliacaea family bulb, native to North America, particularly in the low lands of the Rockies and Sierra Nevadas. This is also why it has the other common name of yellow avalanche lily.
Erythronium grandiflorum shares the genus name with about twenty other species, with common names such as trout lily, E. americanum (due to the fishlike, speckled leaves) and dogtooth violet, E. dens-canis (due to the tooth-shape of the bulb).