Rare and Infrequent Plant Species in the Oak Openings of Northwestern Ohio

Abstract

Frequency of occurrence changes are cited for 154 rare and infrequent taxa of herbaceous vascular plants listed by Edwin L. Moseley in 1928. Of these taxa, approximately 47% are less frequent now (1978) than 50 years ago. Twentysix percent exhibit the same frequency of occurrence and 27% arc more frequent than they were 50 years ago. Approximately 50% of these rare and infrequent taxa are widespread in distribution, 35% are northern, 7.5% are southern, 6% are western and 3% are originally from the Atlantic Coastal Plain. One hundred thirteen new taxa are cited that were not reported by Moseley 50 years ago.