We have two beautiful and authoritative wildflower book sets, one for the Pacific Northwest States and one for the Southwest states, that would be a wonderfully special gift for the botanist in your life.  These sets, edited by Harold William Rickett of The New York Botanical Garden, are oversized volumes with full color photos of each flower adjacent to the descriptions, always a plus in my opinion!  The northern Sierra Nevada is covered in the Pacific Northwest set, and the Southwest includes our more deserty southern areas. 

If you have an incurable gift box shaker, these heavy volumes out to cure her!