Flora of North America: Volume 20: Magnoliophyta: Asteridae, Part 7: Asteraceae, Part 2

Represents a comprehensive taxonomic guide to the diversity of plant life blanketing North America, north of Mexico. This series presents the herbarium, laboratory, and field work of many contributors. It is useful for botanists, conservationists, ecologists, agronomists, foresters, range and land managers, and horticulturists.