HISTOET OF BOTANICAL EXPLOEATIOIST. 127 



in 1836, and proceeded thence to Santa Fe and Zacuapan, which is situated at an 

 elevation of about 3000 feet, and, where, he states *, he encountered the richest vege- 

 tation he ever saw in Mexico. His sketch of the flora of the various regions he passed 

 through agrees in its main features with that of Richard and Galeotti, which we else- 

 where reproduce in a condensed form, varying only in its details, and being altogether 

 very interesting reading. Hartweg's destination was Guanajuato, whither he journeyed 

 by way of Jalapa and Mexico. His first excursion was to El Gigante, the highest point 

 in the mountains of Guanajuato, where the vegetation is of a cold temperate type, 

 such genera as Garrya, Arctostaphylos, Berberis, Bibes, Arbutus, and Quercus abounding, 

 but Pinus was nowhere to be found. The next places visited were Leon and Lagos in 

 Guadalajara, where the country was parched and barren at that season, June and July, 

 accordingly Hartweg proceeded northward to Aguas Calientes, and thence westward to 

 Bolarlos, where the vegetation is quite of the North-Mexican character ; Bromeliaceee, 

 Cactaceae, various species of Agave and kindred plants predominate, and above them 

 Oaks and Pines, Arbutus, &c. Zacatecas, San Luis Potosi, Los Gallitos, were next 

 successively visited, and the first place a second time; whence the journey was 

 continued to Guadalajara and back to Bolanos. This region proving almost fruitless 

 for his purposes, Hartweg went direct to Morelia, the capital of Michoacan, a country 

 of epiphytes and showy herbaceous plants. After two months' stay in this interesting 

 country Hartweg went to Anganguia, Real del Monte, the Barranca Grande of Mextitlan, 

 from its chalky soil " a favourite haunt for Cactaceae," Cereus senilis attaining a height 

 of twenty-four feet, and northward to the barren pine-hills of Zimapan. It was now 

 the beginning of 1839, and he received instructions to go on to Guatemala. To this 

 end he went to Mexico, and there made the necessary arrangements for an overland 

 journey thither, travelling by way of Oaxaca, Las Cruces, Llano Verde, Comaltepec, 

 Totontepec, and returning to Oaxaca, whence an excursion was made to Chinantla ; 

 subsequently journeying direct to Guatemala through Comitan, Huehuetenango, Que- 

 zaltenango, Retalhuleu, Totonicapam, and Mixco to the city of Guatemala. Hartweg 

 here met with Skinner, who accompanied him on several of his excursions in search of 

 orchids. The Volcan de Agua was climbed, and a considerable number of plants 

 collected ; but it was reserved for Salvin and Godman to more fully explore this peak 

 botanically, as well as the neighbouring Volcan de Fuego. After making a few other 

 short excursions in Guatemala, Hartweg proceeded beyond our limits to the equatorial 

 Andes. 



In connexion with Hartweg's collections it should be mentioned that in the earlier 

 part of our Enumeration some of the species are recorded from two places, owing to 

 their having been incorrectly localized in the Hookerian herbarium. The first and 

 fullest set at Kew formed part of the Benthamian herbarium, and the localities given 

 with these may be taken as correct. Respecting the Mexican plants attributed to 

 * Transactions of the Horticultural Society of London, 2nd series, iii. p. 115. 





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