120 
WESTER. 
opinion that the two species ai'e identical although there are 
varietal differences. This view has been further strengthened 
by an examination of the herbarium specimens of the two alleged 
species in the United States National Herbarium, Washington, 
D. C. 
The writer wishes to acknowledge his indebtedness to Doctor 
Audrey Goss for the translation of many passages of works in 
foreign languages which were consulted in the preparation of 
this paper. Plates VI, VII and VIII are from photographs by 
Mr. Crandall of the Bureau of Plant Industry, U. S. Department 
of Agriculture, the others from photographs made by the writer. 
All are published through the courtesy of Mr. David Fairchild 
of the same institution. 
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BIBLIOGRAPHY. 
AiTON, W. Hortus Kewensis 2 (1789) 252. 
AuBLET, F. Histoire des Plantes de la Guiane frangaise 1 (1775) 617. 
. Ibid. 618. 
Blanco, M. Flora de Filipinas (1837) 470. 
. Ibid. 471. 
Botanical Magazine (1831) pi 3095, 
. Ibid. pi. 2011. 
BUL. Soc. Botanique de France 52 (1905) mem. 3: 13. 
. Ibid. 14. 
COBO, P. Historia del Nuevo Mundo 2 (1891) 18. 
Contributions from the U. S. Nat. Herb. 8 (1903) 81. 
. Ibid. 82. 
De Candolle, A. Origin of Cultivated Plants (1886). 
. Ibid. 168. 
. Ibid. 173. 
. Ibid. 174. 
De Candolle, P. Systema Naturae 1 (1818) 474. 
Descourtilz, E. Flore des Antilles 2 (1833) 57, t. 81, 
Don, G. a. General History of Dichlamydeous Plants 1 (1831) 89. 
. Ibid. 
Dunal, F. Monographie de la famille des Anonacees (1817) 70. 
Engler, a. and Diels, L. Monogr. Afr. Pfl. 6 (1901) 77. 
. Ibid. 81. 
Cyclop. Am. Horticulture 1 (1904) 69. 
Foex, F. Estacion Agricola Central Bui. 9 (1908) 17. 
. Ibid. 19. 
. Ibid. 21. 
. Ibid. 17, 12. 
. Ibid. 21, 23. 
Hermann, P. Horti Academici Lugduno Batavi Catalogus (1687) 
645. 
Ruber, J. Arvores Fructiferas do Para (1904) 380. 
Hughes, W. The American Physitian (1672) 60. 
JmX. 
