Heilprin.] ^ [Jan. 15, 



The Temperate and Alpine Floras of the Giant Volcanoes of Mexico. 

 {Being a Report from the Committee on the Michaux Legacy.^ 



By Prof. Angelo Heilprin. 



{Read before the American Philosophical Society, January 15, 1892.) 



Hemsley, in tlie fourth voiume of his report on the botany of Mexico 

 nd Central America, enumerates 130 species of flowering plants, exclu- 

 sive of sedges and grasses,which reach or pass beyond the 10,000-foot line 

 on the slopes of the four principal volcanoes of the Mexican Republic — 

 Orizaba, Popocatepetl, Ixtaccihuatl and the Nevado de Toluca.* This 

 enumeration is based mainly upon the data found on the labels of the 

 various collections illustrating the region, and omits passing citations; it 

 is thus, necessarily, to an extent incomplete, but yet it is an admirable 

 survey of the general features of this upper flora. To Hemsley's list the 

 following species enumerated by Liebmann as occurring on Orizaba can, 

 I think, be safely added, f although possibly a few of the species require 

 redetermination before their position or synonym}' can be satisfactorily 

 established. 



FEET. 



Ranunculus Hookeri 10,000 



Ranunculus llaveanus 10,000 



Cerastium sp.'? 14,000 



Arenaria decussata 10,000 



Arenaria leptophylla? 13,000 



Oxalis latifolia 10,000 



Trifoliuin amabile... 10,000 



Lupinus leptophyllus 10,000 



Fragaria Mexicana 10,000 



Potentilla sp.? 14,000 



Alchemilla venusta 10,000 



Alchemilla vulcanica 10,000 



Alchemilla hirsuta ■ 10,000 



Echeveria mucronata 10,000 



Sedum sp.? 10,000 



Epilobium repens 10,000 



Mentha sp.? 10,000 



Gaura sp.? 10,000 



Pimpinella sp.? 10,000 



Dauca montana 10,000 



Hydrocotyle Mexicana 10,000 



Eryngium sp.? 14,000 



* " A Specimen of tlie Mountain Flora of South Mexico and Central America— 

 Biologia Ccntrali-Amerieana," "Botany," iv, pp. 282-298, 1887. 



t " Vegetation des Piks von Orizaba," Botanische Zeitung. 1844: also translated and 

 abridged in IIem.sley's Report, iv, pp. 145-150. 



