The Alpine Lilly (Lilium parvum) has petals that are less severely rolled back than other, similar-looking lillies. The anthers thus do not protrude above the petals. The flowers are upright, rather than drooping when in bloom. Up to five feet tall.
Similar to a Leopard Lilly (Lilium pardalinum) or Sierra Lilly (Lilium kelleyanum). These pictures, taken at 6500 feet or higher, that discounts the Leopard Lilly, which grows below 6000 feet in the Central Sierra. Both the Sierra and Leopard Lilly have petals that are strongly rolled back and anthers that protrude beyond the petals. Finally, the flowers in bloom sit facing down. The Sierra Lilly can be six feet tall, the Leopard Lilly up to nine feet.