Humboldt's Lily (Lilium humboldtii)
Humboldt's Lily (Lilium humboldtii), California.
The stems of these flowers grow up to five feet tall, and the flowers themselves are pretty big too: the one pictured here was about six inches tall.
I went on a long search for this flower last year, and finally found one in perfect lighting conditions: it had just rained the night before, and there was a thick overcast sky all morning.
For tips on photographing wildflowers, check out my free eBook, 13 tips for better wildflower photography