QK1-989 - Botany
QK1-474.5 General - Including geographical distribution
QK474.8-495 Spermatophyta. Phanerogams
QK640-707 Plant anatomy
QK710-899 Plant physiology
QK900-989 Plant ecology
"The PLANTS Database provides standardized information about the vascular plants, mosses, liverworts, hornworts, and lichens of the U.S. and its territories. It includes names, plant symbols, checklists, distributional data, species abstracts, characteristics, images, crop information, automated tools, onward Web links, and references."