The Vascular Flora of Pennsylvania: Annotated Checklist and Atlas

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American Philosophical Society, 1993 - 636 páginas
The PA Flora Database (PFD) has its roots in the work of Edgar Wherry, John Fogg, Jr., and Herbert Wahl, the "Atlas of the Flora of PA", pub. by the Morris Arboretum of the Univ. of PA. Over a period of 40 years, Wherry and his colleagues gathered data from the major PA herbaria and manually placed a quarter of a million dots on over 3,500 maps, which are reproduced in this volume. The checklist of included taxa has undergone extensive review to reflect recent taxonomic and nomenclatural revisions. Recent discoveries have been added and distribution data has been updated. This volume also includes collections made in the 1990s in conjunction with the PA Natural Diversity Inventory. Extensive illustrations. Reprinted 1996.
 

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Página 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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