Wildflowers Every Child Should Know (1909) by Frederic William Stack. Stack was a field collector for the Scientific Section, Vassar Brothers Institute; and Natural History at Vassar College. 
To my bonny boy, whose many inquiries have suggested this undertaking, I owe my everlasting gratitude and affection.  ~ Frederic William Stack, New Rochelle, New York, April 1909 (Preface)