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Longleaf Universe
http://www.longleafuniverse.com/
Notes on distribution of Longleaf Pine.
Native Conifers of North America - Pinus palustris
http://www.nearctica.com/trees/conifer/pinus/Ppalus.htm
Description and images of Longleaf Pine.
Pinus palustris
http://www.botanik.uni-bonn.de/conifers/pi/pin/palustris.htm
Description and images of the Longleaf Pine of the southeastern USA.
Pinus palustris
http://www.fs.fed.us/database/feis/plants/tree/pinpal/
Includes distribution and occurrence, botanical and ecological characteristics, value and use, and fire ecology.
Pinus palustris
http://www.albion.edu/plants/pinupapg.htm
Images of longleaf pine.
Pinus palustris Fact Sheet
http://www.cnr.vt.edu/dendro/dendrology/syllabus/ppalustris.htm
Description and images of Longleaf Pine.
Pinus palustris Mill
http://www.na.fs.fed.us/spfo/pubs/silvics_manual/Volume_1/pinus/palustris.htm
Detailed description from the USDA silvics manual.