Third Contribution to the Coastal and Plain Flora of 



Yucatan. 



CHARLES F. MILLSPAUGH, M.D. 



Since the issue of the second of these contributions, this Museum 

 has been so fortunate as to secure from the widow of the late Dr. 

 Arthur Schott, his entire herbarium, which includes about nine hun- 

 dred Yucatan plants collected by him in 1864-66 while engaged by 

 the Mexican Government to make a geologic survey of the Peninsula. 

 This collection is of great importance, it being the first really com- 

 prehensive attempt to collect the flora of this region. It is, however, 

 to be regretted that Dr. Schott's idea of numeration should have been 

 that of numbering his collections at home, instead of in the field, and 

 attempting to group his species of whatever habitat under certain 

 arbitrary numbers, before such species had been positively ascertained. 

 This will cause conflict between many of the numbers published in 

 these contributions and those in the herbaria of the National Museum 

 and Kew, where part sets of these plants have been previously 

 deposited by him. A majority of his plants are included in this con- 

 tribution. 



In 1890 an expedition was sent into Mexico under the auspices 

 of the Academy of Natural Sciences of Philadelphia, and in charge 

 of Prof. Angelo Heilprin. The work extended from the Orizaba 

 region to the Peninsula of Yucatan, where Mr. Witmer Stone, the 

 Ornithologist of the party, incidentally collected about three hundred 

 plants. These were approximately determined by the late Mr. J. H. 

 Redfield and distributed, as about ninety-five species, in the herb- 

 arium of the Academy, whence they have been kindly reassembled 

 by Mr. Stewardson Brown, and communicated to me for study by 

 the Academy. These species, so far as determined at this time, are 

 also included here. 



Even a limited opportunity to examine the collections at the 

 herbarium of Columbia University convinces me that the collection 

 made by the Hon. E. P. Johnson in Yucatan and Tabasco, in 1848, 



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