|ALLERGY AND ASTHMA IN THE SOUTHWESTERN UNITED STATES
Illustrations by Lucretia Breazeale Hamilton, from An Illustrated Guide to Arizona Weeds, by Kittie F Parker. Copyright ©1972 by the Arizona Board of Regents. Reprinted by Permission. These illustrations may not be reproduced or downloaded without the express permission of the University of Arizona Press
Flowering period in Southern Arizona: March - June.