76 TRANSACTIONS OF THE [jAN. 21, 



EQUISETE^. 



Equisetum roiusfum, A. Br. Fossil Creek (250). 

 Equisetum paludre, L. Clark's Valley (125). 



MUSCI. 



Hypnum rusciforme, Weis. Fossil Creek (282, 283). 



GASTEROMYCSTES. 



Lycoperdoii airopurinireumy Vitt. Named by Mr. Chas. H. 

 Peck. Mogollon Mts. (37). 



GENERAL FLORAL FEATURES OF THE SAN FRANCISCO AND 

 MOGOLLON MTS. OF ARIZONA AND NEW MEXICO, AND THEIR 

 ADJACENT REGIONS. 



BY H. H. RUSBT, M.D. 



The territory here considered comprises three distinct regions — 

 an elevated, open, somewhat barren table-land; a still more 

 elevated heavy forest belt, and a low, desert, mostly sandy plain. 



The first comprises the northern and north-eastern portions, 

 and is the continuation of the high plateaus of New Mexico and 

 Utah. It is traversed by a number of profound canyons, with 

 precipitous walls a mile or more in height, and by many others 

 of less depth. It supports some isolated ridges and peaks besides 

 the second region above-named. Upon them occurs some good- 

 sized timber, including trees like Pinus ponderosa, Dough; P. 

 edulis, Eng. ; Junijyerus occidentalis, Hook.; var. monosperma, 

 Eng. ; J. pachy2Mcea, Torr.; Fraxinus pistacicefoUa, Torr., and 

 Quercus of several species; the largest and most important 

 being Q. imdulata, var. Gambelii, Eng., and Q. oUongifolia, 

 Torr. Occasionally we see a tree of Juglans riqiestris, Eng. 

 Among the smaller trees and shrubs, the most conspicuous are 

 Mortis microphylla, Buckley; Cejxocarjjus parvifolius, Nutt. ; 

 Forestiera Neo-Mexicana, Gray; Garry a FremonUi, Torr.; 

 Rihes aureum, Pursh; Ardosiophylos ptmgens, H. B. K., and a 

 number of small oaks, notably Q. grisea, Liebm., and Q. hypo- 

 leuca, Eng. These elevated portions, with some river-bottoms, 

 where we often find cotton-woods and sycamores and the 

 gigantic Alnus oUongifolia, Torr., constitute about the whole 

 of the forest area of this division. The entire level portion of 

 the plateau is destitute of everything larger than shrubbery, 

 characteristic among which may be mentioned the Yuccas, 

 chiefly Y. haccata, Torr., and Y. angustifoUa, Pursh, Arte- 



