282 APPENDIX. 



and south of 40°, thirty-six belong to the genera Cheilanthes, Pellcea, and Notholcena. 

 Further observations on this subject will be found at p. 224. Incidentally, but not 

 as having any particular bearing on the distribution of the North-Mexican species, 

 it may be stated that the fern-flora of America north of Mexico comprises about 150 

 species, or less than a fourth more than the small area of New Zealand. 



Coming to the rest of the Vascular Cryptogams, Mr. J. G. Baker, who has recently 

 published a synopsis, divides them into four orders, eleven genera, and about 550 species. 

 All the orders, seven of the genera, and sixty-two of the species are represented in 

 Mexico and Central America conjointly. The absent genera are Pilularia and Iso'etes, 

 subaquatics which may be expected to occur ; and the remarkably distinct Austral- 

 asian Phylloglossum and Tmesipteris from Australasia and Polynesia, also recorded 

 (erroneously '?) from California. The distribution of these Cryptogams within our limits 

 calls for no special remarks, except that they are comparatively rare in North Mexico, 

 numerous in South Mexico, and imperfectly investigated in the southern countries. 

 Their general distribution is given in some detail in vol. iii. under the several orders. 

 Some of the species (Lycopodium clavatum, for example, as pointed out by Baker in 

 his little book on Geographical Botany) belong to " meiotherms " which are practically 

 universal in temperate regions, including the mountains of the tropics. 



A SPECIMEN OF THE MOUNTAIN FLORA OF SOUTH MEXICO 

 AND CENTRAL AMERICA*. 



feet. 



Thalictrum (W.) densiflorum (E.) Moran, Mexico. 8,000 



hernandezii (E.) Toluca, 



Ranunculus (W.) geoides (E.) Orizaba, 



ornithorrhynchus (N.) Toluca, 



petiolaris (E.) Santa Eosa, 



peruvianus (A.) Orizaba, 



sibbaldioides (A.) Toluca, 



8,200 



9,000 to 12,000 



8,200 to 9,000 



8,400 

 12,000 to 12,500 

 12,000 



8,000 



8,000 to 8,500 



Aquilegia (W.), sp. (E.) Oaxaca, 



Delphinium (W.) latisepalum (E.) Oaxaca, 



Berberis (W.) paniculata (E.) Irazu, Costa Eica. 8,000 to 9,000 



Nasturtium (W.) arabiforme (E.) Oaxaca, Mexico. 8,000 to 9,000 



impatiens (E.) Orizaba, „ 11,000 to 12,000 



orizabse (E.) Orizaba, „ 10,000 to 12,000 



Draba ( W.) myosotidioides (E.) Orizaba, „ 12,000 to 13,000 



* The letters placed after the genera and species have reference to their distribution : — E. signifies endemic 

 in South Mexico and Central America; N. extending in America north of Mexico ; S. extending into South 

 America or the West Indies, or both ; A. peculiarly Andine ; N, & S. extending into both North and South 

 America ; W. of wider range than America. 



