Reviews the current status of plant conservation in the southwestern U.S., citing specific cases from surveys, and genetic, demographic, and ecological studies. In addition, broad issues affecting the paradigms of conservation of rare plants species in an ecosystem management context are reviewed. Contents: public involvement in plant conservation; demography; genetics; issues concerning rarity and preserving biodiversity; reproductive and pollination biology; autecology; strategies for protection in an ecosystem context; and surveys and monitoring. 40 papers. Illus.