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| Last Name | First Name | Dates | Confirmed | Volume Number | Page Number | Correspondence Information | Image | Other archives materials |
|---|---|---|---|---|---|---|---|---|
| Paine | John Alsop | 1840-1912 | birth and death dates verified TL2 | 4 | 66 | 4 page letter from Newark, NJ, 30 May 1870. | no image | Historic Letter Collection |
| Palisot de Beauvois | Ambrose Marie Francois Joseph | 1752-1820 | birth and death dates verified TL2 | 4 | 67 | 1 page letter from Paris, France (No date but Gray notes it was before 1815) | sketch 7"x5 1/2" | Photographic Archives #0538 |
| Pallas | Peter Simon | 1741-1811 | birth and death dates verified TL2 | 4 | 68 | 4 pages to Marquis Gherardini (No dates) | sketch 3"x4" | |
| Palmer | Edward | 1831-1911 | birth and death dates verified TL2 | 4 | 68 | 2 pages from Washington, D.C, 3 March 1871 | photo 4"x2 1/2" | Historic Letter Collection; Photographic Archives #1031, #0663, #0295, #0921 |
| Pancher | Jean Armand Isidore | 1814-1877 | birth and death dates verified TL2 | 4 | 69 | 1 page from Tahiti, Soc. Islands. 27 October 1856 | no image | |
| Pappe | Karl Wilhelm Ludwig | 1803-1862 | birth and death dates verified TL2 | 4 | 69 | Label | no image | |
| Parish | Samuel Bonsall | 1838-1928 | birth and death dates verified TL2 | 4 | 70 | 1 page from San Bernardino, CA, 28 July 1886 | no image | Historic Letter Collection; Photographic Archives #0296, #0624 |
| Parkinson | John | 1567-1650 | birth and death dates verified TL2 | 4 | 70 | no autograph | sketch 3 1/4"x4 1/4" | |
| Parkman | Francis | 1823-1893 | birth and death dates verified Barnhart | 4 | 71 | signature only from London, England | no image | Historic Letter Collection |
| Parlatore | Filippo | 1816-1877 | birth and death dates verified TL2 | 4 | 71 | 3 page letter from Florence, Italy 1873. | no image | Historic Letter Collection |
| Parolini | Alberto | 1788-1867 | birth and death dates verified Barnhart | 4 | 72 | 2 page letter from Bassano, Italy 1858 | no image | |
| Parry | Charles Christopher | 1823-1890 | birth and death dates verified TL2 and Barnhart | 4 | 73 | 4 pages from Davenport, Iowa. 31 January 1867 | photo 3 1/2"x4 1/2" | Photographic Archives #0716, #0297,#0298, #0299, #0300, #0301 |
| Parseval-Grandmaison | Jules de | 1795-1876 | birth and death dates verified Barnhart | 4 | 73 | 2 page letter from Wacon, France 25 March 1865 | photo 3 3/4"x2 1/4" | Historic Letter Collection |
| Pasquale | Giuseppe Antonio | 1820-1893 | birth and death dates verified TL2 | 4 | 74 | autograph 11 April 1869. | no image | |
| Passerini | Giovanni | 1816-1893 | birth and death dates verified TL2 | 4 | 74 | Envelope from Parma, Italy 1868 | no image | |
| Patterson | Harry Norton | 1853-1919 | birth and death dates verified TL2 | 4 | 133 | 1 page letter from Ognawka, Illinois, 5 October 1885 | no image | Historic Letter Collection; Photographic Archives #0302 |
| Pavon | Jose Antonio | 1754-1844 | birth and death dates verified TL2 | 4 | 75 | 3 page letter from Madrid, Spain 28 May 1832 | no image | |
| Peck | William Dandrige | 1763-1822 | birth and death dates verified TL2 | 4 | 76 | 1 page letter from Boston 4 April 1806 and 2 page letter, 21 May 1805 | 2 sketches (4"x6" & 2 1/2"x2 1/2") | Photographic Archives #0304, #0719, #0478 |
| Pedicino | Nicola Antonio | 1839-1883 | birth and death dates verified TL2 | 4 | 77 | card from Naples, Italy (no date) | no image | |
| Pennant | Thomas | 1726-1798 | birth and death dates verified TL2 | 4 | 77 | 2 pages from Flintshire, England, 24 September 1769 | sketch 4"x3 1/2" | Personal Papers in Gray Archives |
| Perrottet | George Samuel | 1793-1870 | birth and death dates verified TL2 | 4 | 78 | 2 pages from Paris, France 1829 | no image | |
| Perry | Matthew Calbraith Commodore | 1795-1858 | birth and death dates unverified | 4 | 79 | 1 page from New York, NY 28 April 1857 | no image | Historic Letters Collection |
| Persoon | Christiaan Hendrik | 1762-1836 | birth and death dates verified TL2 | 4 | 135 | 3 page letter from Paris, France 1809; label | no image | |
| Peter | Robert | 1805-1894 | birth and death dates verified Barnhart | 4 | 81 | 1 page letter from Louisville, KY | no image | |
| Peters | Thomas M. (Judge) | 1810-1888 | birth and death dates verified Barnhart | 4 | 81 | 2 page letter from Moulton, Alabama, 16 March 1870 | no image | Historic Letters Collection; Photographic Archives #0611 |
| Petter | Franz | 1798-1853 | birth and death dates verified Barnhart | 4 | 81 | Label | no image | |
| Pfeiffer | Ludwig, M.D. | 1805-1878 | birth and death dates unverified | 4 | 82 | 3 page letter from Cassel, Prussia 1835 | no image | Historic Letters; Photographic Archives #0465 |
| Phelps | Mrs. Almira Lincoln | 1793-1884 | birth and death dates verified TL2 | 4 | 83 | 1 page letter from Baltimore, MD, 25 January 1800 | photo 2 3/4"x3 3/4" | Photographic Archives #0723 |
| Pickering | Charles M.D. | 1805-1878 | birth and death dates verified TL2 | 4 | 83 | 1 page letter from Philadelphia, PA, 11 October 1836 | no image | Historic Letters Collection |
| Piddington | Henry | 1797-1858 | birth and death dates verified TL2 | 4 | 84 | 2 page letter from Calcutta 1823 | no image | |
| Pirotta | Pietro Romualdo | 1853-1936 | birth and death dates verified TL2 | 4 | 85 | 1 page letter from Rome, Italy, 3 December 1884 | no image | |
| Pitcher | Zena M.D. | 1797-1872 | birth and death dates verified TL2 | 4 | 85 | 2 page letter, 2 November 1860 | no image | Historic Letters Collection |
| Planchon | Jules Emile | 1823-1888 | birth and death dates verified TL2 | 4 | 86 | 4 page letter from Montpelier, France 1869. | photo 2 1/2"x4" | |
| Pohl | Johann Baptist Emanuel | 1782-1834 | birth and death dates verified TL2 | 4 | 86 | Map of Candolla (no date) | no image | |
| Poinsett | Joel Roberta | 1779-1851 | birth and death dates verified Barnhart | 4 | 87 | 4 page letter from Mexico, 25 October 1827 | no image | |
| Poiret | Jean Louis Marie | 1755-1834 | birth and death dates verified Barnhart | 4 | 88 | 2 page letter regarding travel in Africa and description of plants | sketch 4"x3" | |
| Poiteau | Pierre Antoine | 1766-1854 | birth and death dates verified TL2 | 4 | 88 | 1 page letter from Paris, France | no image | |
| Porter | Jacob M.D. | no dates | birth and death dates unverified | 4 | 89 | 1 page letter from Plainfield, MA 1834 | no image | |
| Porter | Thomas Conrad | 1822-1901 | birth and death dates verified TL2 | 4 | 89 | 3 page letter from Lancaster, PA, 24 December 1858. | 2 photos 5 3/4"x4" & 2 1/4"x3 1/2" | Historic Letters Collection; Photographic Archives #0871, #0315, #0316 |
| Post | George Edward | 1838-1909 | birth and death dates verified TL2 | 4 | 90 | 3 page letter from Beirut, Syria, 22 February 1877 | no image | |
| Potonie | Henry | 1857-1913 | birth and death dates verified TL2 | 4 | 90 | 3 page letter from Berlin, Prussia, 19 July 1883. | no image | |
| Pott | Johann Friedrich, M.D. | 1738-1805 | birth and death dates verified TL2 | 4 | 91 | 1 page letter from Braunschweig, Hanover 1802 | no image | |
| Potts | Edward | 1829-? | birth and death dates unverified | 4 | 91 | 2 pages from Philadelphia, PA, 22 October 1879 | no image | |
| Pourret | Pierre Audre | 1754-1818 | birth and death dates verified TL2 | 4 | 92 | 4 pages including a list of plants, 3 labels | no image | |
| Pourtales | Louis Francois de. | 1824-1880 | birth and death dates verified Barnhart | 4 | 92 | 1 page from Boston, MA, 12 December 1873. | no image | |
| Powell | S.M. | no dates | birth and death dates unverified | 4 | 93 | 3 page letter from Franklin, NC, 24 November 1843 | no image | Historic Letters Collection |
| Prestele | Joseph | no dates | birth and death dates verified Barnhart | 4 | 94 | 1 page letter from Buffalo, NY, 3 February 1858 | no image | Historic Letters Collection |
| Pringle | Cyrus Guernsey | 1838-1911 | birth and death dates verified TL2 | 4 | 94 | 1 page letter from Charlotte, VA 18 February 1886 | 2 photos (2 1/2"x4" & 6"x4 1/2") | Historic Letters Collection; Photographic Archives #0321, #0320, #0325, #0318, #0688, #0322, #0323, #0319, #0583 |
| Pringsheim | Nathanael | 1823-1894 | birth and death dates verified TL2 | 4 | 95 | 1 page letter from Berlin, Prussia 8 October 1884 | no image | |
| Prior | Alexander Richard Chandler M.D. | 1809-1902 | birth and death dates verified TL2 | 4 | 95 | 4 page letter from England, 6 October 1868 | 2 photos (6 1/4"x8" & 2 1/4"x3 1/2") | Historic Letters Collection |
| Prost | T.C. | ?-1848 | birth and death dates verified TL2 | 4 | 96 | 2 page letter from Mende, France, 1815 | no image | |
| Provancher | Leon Abbe | 1820-1892 | birth and death dates verified TL2 | 4 | 97 | 2 page letter from Canada, 27 January 1863 | no image | Historic Letters Collection |
| Pulteney | Richard M.D. | 1730-1801 | birth and death dates verified TL2 | 4 | 98 | 2 page from Blandford, England 27 July (no year) | no image | |
| Pursh | Frederick Traugott | 1774-1820 | birth and death dates verified TL2 | 4 | 99 | 2 page List of Rivers, Label | no image | |
| Putnam | Joseph Duncan | 1855-1881 | birth and death dates verified Barnhart | 4 | 100 | 1 page letter from Tarrytown, NY, 8 October 1876 | no image | Historic Letters Collection |