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  1. By: Downing, A. J. (Andrew Jackson),
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Bartonia  Belknap, William G. (William Goldsmith), 1794-1851  Bentham, George, 1800-1884  Botanical specimens  Buel, Jesse, 1778-1839  Corema conradii  Correspondence  Cottage residences  Croom, Hardy Bryan, 1797-1837  Croomia pauciflora  Cycas  De Kay, James E. (James Ellsworth), 1792-1851  Dickerson, Mahlon, 1770-1853  Dionaea  Douglas, David, 1799-1834  Downing, A. J. (Andrew Jackson), 1815-1852  Eschscholzia californica  Euphorbia  Euphorbia pulcherrima  Gilia tricolor  Graham, Robert, 1786-1845  Gray, Asa, 1810-1888  Gymnocladus  Horticultural Society of London  Hosack, David, 1769-1835  Hovey, C. M. (Charles Mason), 1810-1887  Introduction to the natural system of botany  Knevels, John W., -1855  Ladies' botany  Le Conte, John Eatton, 1784-1860  Limnanthes douglasii  Lindley, John, 1799-1865  Loudon, J. C. (John Claudius), 1783-1843  Lyceum of Natural History (New York, N.Y.)  Magnolia acuminata  Massachusetts Horticultural Society  Mather, W. W. (William Williams), 1804-1859  McNab, William, 1780-1848  Nees von Esenbeck, C. G. (Christian G
    BHL Collections: John Torrey Papers | New York Botanical Garden
  2. By: Crawshaw, Edmund.
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    Subjects: 1809-1884  Correspondence  Crawshaw, Edmund  Diseases and pests  Engelmann, George,  Letters  Pyrus  Rosaceae  
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
  3. By: Letterman, George W. (George Washington),
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    Subjects: (George Washington),  (Heinrich Karl Daniel),  (Julien),  1809-1884  1810-1888  1813-1883  1822-1893  1826-1901  1831-1904  1836-1905  1840-1913  1841-1904  1841-1927  Acer  Arabis  Botanical specimens  Canby, William Marriott,  Carya  Cheilanthes  Collectors and collecting  Correspondence  Cruciferae  Eggert, Henry  Engelmann, George,  Fendler, Augustus,  Franklin County  Galium  Gray, Asa,  Hepaticae  Heuchera  Hybridization  Jefferson County  Juglandaceae  Letterman, George W  Letters  Meehan, Thomas,  Missouri  Plants  Populus  Pteridophyta  Pyrus  Receipts (Acknowledgments)  Reverchon, J  Rhamnaceae  Rosaceae  Rubiaceae  Saint Louis County  Salicaceae  Sapindaceae  Sargent, Charles Sprague,  Saxifregaceae  Vasey, George,  Wood
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
  4. By: Opoix, Octave.
    Edition: 4. éd., corr. et augm.
    Publication info: Paris :Librairie Octave Doin,1921.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Culture  Malus pumila  Pyrus  
    BHL Collections: New York Botanical Garden
  5. By: Weldon, Geo. P. (George Percival),
    Publication info: Sacramento :State Print. Off.,1918.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: California  Culture  Fruit-culture  Pyrus
    BHL Collections: New York Botanical Garden
  6. By: Hedrick, U. P. - Francis, E. H. - Howe, G. H. - Taylor, O. M. - Tukey, H. B. (Harold Bradford), - New York (State). Department of Agriculture. - New York State Agricultural Experiment Station.
    Publication info: Albany,Lyon,1921.
    Holding Institution: Multiple institutions
    Subjects: Culture  Fruit-culture  New York (State)  Pears  Pyrus  Varieties  
    BHL Collections: New York Botanical Garden
  1. By: Delucchi,Gustavo - Farina,Eduardo - Torrres Robles,Silvia S.
    Type: Article
    In: Boletín de la Sociedad Argentina de Botánica
    Date: 2009-07-01
    Subjects: Argentina  Buenos Aires  Naturalización  Pyrus  Rosaceae
  2. By: LIU, Bin-Bin - Liu, Guang-Ning - Hong, De-Yuan - Wen, Jun
    Type: Article
    In: PhytoKeys
    Volume: 139
    Date: 2020
    Page Range: 99-118
    Publication info: Pensoft Publishers 2020
    Subjects: integrative systematics  lectotype  Loquat  neotype  Nomenclature  Pyrus  Rhaphiolepis  taxonomy