98. 
99. 
100. 
101. 
102. 
108. 
108. 
109. 
110. 
112. 
113. 
115. 
Hoover, L. G. 1923. The Chayote: Its culture and _ uses. 
U.S.D.A. Dept. Cire. 286: 1-11. 
Hornell, J. 1946. How did the sweet potato reach Oceania? 
Jour. Linn. Soc, 53: 41-62. 
House, Homer D. 1908. The North American species of the 
genus Ipomoea. Ann. N.Y. Acad. Sci 18 (6): 181-263. 
Howes, F. N. 1930. Chenopodium Nuttalliae, a Mexican cereal. 
Kew Bull. 1930: 332-333. 
Hunziker, Armando T. 1943. Las especies alimenticias de 
Amaranthus y Chenopodium cultivadas por los indios de América. 
Rev. Argent. Agron. 10: 297-354. 
Husted, Ladley. 1936. Cytological studies on the peanut, 
Arachis. 11. Chromosome number, morphology and behavior, 
and their application to the problem of the origin of the culti- 
vated forms. Cytologia 7: 396-423. 
Hutchinson, J. B. 1951. Intra-specific differentiation in Gos- 
sypium hirsutum. Heredity 5: 161-193. 
5. ——, R. A. Silow and S. G. Stephens. 1947. The evolution of 
Gossypium. London. 
. Irish, H. C. 1898. A revision of the genus Capsicum with special 
reference to garden varieties. Ninth Ann. Report Mo. Bot. 
Gard., 53-110. 
. Jenkins, J. A. 1948. The origin of the cultivated tomato. Econ. 
Bot. 2: 379-392. 
Kelly, Isabel. 1951. The bottle gourd and Old World contacts. 
(in) Homenaje al Dr. Alfonso Caso, 207-214. Mexico, D.F. 
Kobiakova, J. A. 1930. The bottle gourd, Lagenaria vulgaris 
Sér.—a relict crop. Bull. Appl. Bot. Gen. Pl. Breed. 23 (3): 
475-520. (Russian 475-518, English summary 519-520). See 
also, Obolentzeff. 1943. Review of the above. Rev. Argent. 
Agron, 10: 289-298. 
de La Llave, Pablo. 1884. Sobre una especie nueva de Salvia. 
La Naturaleza 7 (app.): 77-80. 
. Luckwill, Leonard C, 1943. The genus Lycopersicon. An his- 
torical, biological and taxonomic survey of the wild and culti- 
vated tomatoes. Aberdeen Univ. Studies 120: 1-44, 
——, 1948. The evolution of the cultivated tomato. Journ. 
Roy. Hort. Soc. 68: 19-25. 
Lundell, C. L. 1939. Plants probably utilized by the Old Em- 
pire Maya of Peten and adjacent lowlands. Pap. Mich. Acad. 
Sci. Arts and Letters 24 (1): 37-56. 
. ——. 1945. The genus Cnidosculus in Mexico: new species and 
critical notes. Bull. Torr. Bot. Club 72: 319-334. 
McBryde, Felix W. 1947. Cultural and historical geography of 
southwest Guatemala. Smithson. Inst. Soc. Anthrop. Pub. 4: 
1-184. 
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