The Vascular Flora of Pennsylvania: Annotated Checklist and Atlas

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American Philosophical Society, 1993 - Philosophy - 636 pages
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This vol. is the first published product of the Pennsylvania Flora Database, created & maintained at the Morris Arboretum of the U. of Pennsylvania. The database has its roots in the work of Edgar T. Wherry, John M. Fogg, Jr., & Herbert A. Wahl, the Atlas of the Flora of Pennsylvania” (Wherry et al. 1979), published by the Morris Arboretum. Over a period of 40 years, Wherry & his colleagues gathered data from the major Pennsylvania herbaria & manually placed a quarter of a million dots on over 3500 maps (Fogg 1944). The Pennsylvania Flora Database retains the emphasis on specimen-based, site-specific data. The checklist of included taxa has undergone extensive review to reflect recent taxonomic & nomenclatural revisions. Questionable specimens have been re-evaluated with the result that several taxa included in earlier works were dropped. Recent discoveries have been added & distribution data has been updated. This vol. also includes collections made in the 1990s in conjunction with the Pennsylvania Natural Diversity Inventory (PNDI), the state heritage program. The maps present the accumulated collection of information for each taxon as represented in the herbaria. Illus., reprinted 1996.

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Page 577 - Compendium Florae Philadelphicae, containing a description of the indigenous and naturalized plants found within a circuit of ten miles around Philadelphia.
Page 3 - ... Indian corn. The annual precipitation of the area ranges between 40 inches in the easterly and southerly portions to 25 inches in the more westerly and northerly parts. Fortunately, the greater part of the precipitation, 60 to 80 per cent, is in the form of rainfall during the spring and summer months. The length of the growing season ranges from 180 days in the south and east to 130 days in the more northerly parts. The heaviest concentration in corn production centers in Iowa and Illinois,...

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