Heilpriu.j ^ [Jau. 15, 



Erigeron maximus on Popocatepetl 11,200 



Baccharis concava on Popocatepetl 11,000 



Gnaplialium oxyphyllum on Orizaba 13,500 



Senecio salignus on Ixtaccihuatl 13,200 



Arbutus spinulosus on Popocatepetl 10,500 



Alnus castanfE folia on Popocatepetl. 10,500 



Draba aretoides (?) on Ixtaccihuatl 13,200 



A number of other plants, such as Habenaria prasina, Platanthera 

 nubigena, P. longifolia, Malaxis gracilis (among orchids), have been 

 cited by Martens and Galeotti from the peak of Orizaba, so that the total 

 list is brought close up to 200 species. I have in the table that follows 

 appended the approximate elevations at which the plants occur, relying 

 largely upon the data furnished by Hemsley. The letters that precede 

 the names of the species have reference to the special mountain peak 

 upon which the plants were found : O., Orizaba ; P., Popocatepetl ; I., 

 Ixtaccihuatl, and T., Nevado de Toluca. The author wishes in this con- 

 nection to express his indebtedness for various forms of assistance to 

 Messrs. Thomas Meehan, John H. Redfield, Isaac Burk and Witmer 

 Stone, members of the Academy of Natural Sciences. 



To 10,000 10-12,000 12-13,000 13-15,000 



FEET. FEET. FEET. FEET. 



O. Ranunculus geoides 9-12,000 



O. R. Peruvianus 12,500 



O. R. Hookeri 10.000 



O. R. llaveanus 10,000 



O. R. sp.? 14,000 



O. Nasturtium impatiens ... . 11-12,000 



O. " Orizabte 12,000 



0. Draba myosotidioides 12-13,000 



P. '• Popocatepetlensis. . 12,000 



T. " Tolucensis 8-14,000 



1. " aretoides? (alsoO.) 13,200 

 O. Sisymbrium canescens 12,000 



O. " Galeottianum. 8-11,000 



T. Erysimum macradenium. . 12-13,000 



O. Viola ciliata . 10,000 



O. " sp? 14,000 



T. Cerastium andinum 13,000 



O. " orilhales 12,000 



O. " vulcanicum. .. 10-12,000 



O. " sp.? 14,000 



(). Arenaria alsinoides 10-12,000 



O. " decussata 10,000 



O. " bryoides 12,500 



