Harvard University for his continuing encouragement and sup- 
port of coca research and for providing access to the H. H. 
Rusby collections. | would like to thank Susan Marie Rossi 
for her long hours spent in searching for Rusby’s invaluable 
coca collections. Drs. Ramon Ferreyra and Oscar Tovar of the 
Museo Nacional de Historia Natural in Lima graciously gave 
valuable advice and assistance in field work. I also wish to 
thank the curators of the herbaria (cited according to the stan- 
dard abbreviations of Holmgren and Keuken, Index Herbario- 
rum, 1974) who kindly supplied herbarium specimens on loan 
for this study. 
REFERENCES 
Burck, W., 1890. Opmerkingen over de onder den Naam van Erythroxylon 
Coca in nederlansch Indie gecultiveerde gewassen. Teysmannia I: 385- 
398, 449-464. t. 1-3. 
Ganders, F. R., 1979. Heterostyly in Erythroxylum Coca (Erythroxylaceae). 
J. Linn. Soc. Bot. 78: 11-20. 
Gentner, W. A., 1972. The Genus Erythroxy/um in Colombia. Cespedesia 
1: 481-554. 
Griffiths, C. O., 1930. Examination of coca leaves found in a pre-Incan 
grave. J. Pharm. Pharmcol. 3: 52-58. 
Harms, H. von, 1922. Ubersicht der bisher in altperuanischen Grabern 
gefundenen Pflanzenreste. Festschrift Eduard Seler. Stuttgart. p. 180. 
Hieronymus, G., 1895. Plantae Lehmannianae in Guatemala, Costarica, 
Colombia et Ecuador collectae. Bot. Jahrb. Syst. 20, Beibl. 49: 35. 
Holmstedt, B., E. Jaatmaa, K. Leander & T. Plowman, 1977. Determination of 
cocaine in South American species of Erythroxylum using mass fragmen- 
tography. Phytochemistry 16: 1753-175S. 
Machado, E., 1969. Erythroxylaceae Novae II. Anales Ci. (Lima) 7(1~—2): 
14-17. 
Machado, E., 1972. El genero Erythroxylon enel Peru. Raymondiana 5: 5-101. 
Martius, C. F. P. von, 1843. Beitrage zur Kenntnis der Gattung Erythro- 
xylon. Abh. Akad. Miinchen 3: 367-369. t. 6. 
Morris, D., 1889. Coca. Bull. Misc. Inform. (Kew) 25: 1-13. 
Payens, J. P. D. W., 1958. Erythroxylaceae. Flora Malesiana 5: 543-552. 
Plowman, T., 1976. Orthography of Erythroxylum (Erythroxylaceae). 
Taxon 25: 141-144. 
Plowman, T., L. Riidenberg & C. W. Greene, 1978. Chromosome numbers 
in neotropical Erythroxylum (Erythroxylaceae). Bot. Mus. Leafl. 
Harvard Univ. 26: 203-209. 
Plowman, T., 1979a. Botanical Perspectives on Coca. J. Psyched. Drugs 
11: 103-117. 
Plowman, T., 1979b. Amazonian Coca. Paper presented before the 43rd 
International Congress of Americanists, Aug. 15, 1979, Vancouver, 
Canada. 
60 
