170 APPENDIX. 



In conclusion, it may be explained that the totals in the American column, added to 

 the endemics in the first division, should equal the totals in the first division, except in 

 the exceedingly rare instances of Mexican or Central-American genera and species 

 extending beyond America but not to other parts of America. We believe there is no 

 instance of a Mexican or Central- American species extending to other countries without 

 also being found in some other part of America ; but there are two genera, namely 

 the variously circumscribed Erblichia and Abelia. Further, the totals mentioned in 

 the extra- American column, added to the number of " America only," should equal 

 the totals in the American column *. 



* Eeference may here be made to Kotschy's ' TTeberblick der Vegetation Mexico's.' This is a very concise 

 summary of the Flora of Mexico, read before the Vienna Academy of Sciences in February 1852, and, as appears 

 in a footnote on the third page of a reprint, was intended as the forerunner of a ' Flora Mexicana, sive Enu- 

 meratio Plantarum in Regno Mexicanorum provenientium et hucusque in diversis operibus descriptarum.' More- 

 over, in the concluding sentences of the summary, it is stated tbat this " Enumeration " was presented at the 

 same time and was ready for the printer ; and the writer goes on to say that he should esteem himself fortu- 

 nate if it were considered worthy of a place in the publications of the Academy. From some cause it never 

 was published, hence we could make no use of it ; but from a table in the summary we extract the following 

 figures : — Genera, including Acotyledones, 1680, comprising 7338 species ; of which 1363 were from the 

 " tierra caliente," 2677 from the " tierra templada," and 1537 from the " tierra fria." Kotschy further men- 

 tions that these plants were from the country lying between the sixteenth and twenty-third parallels of 

 latitude. Whether the latter was a slip for thirty- third is doubtful; yet it is probable, though at that date 

 little was known of the vegetation of Northern Mexico ; otherwise the area corresponds very closely to our 

 South Mexico. 



