32 



VEGETATION OF A DESERT MOUNTAIN RANGE. 



are the low thorny shrub Ceanothus fendleri, or varieties of it, and the 

 bunch-grass Muhlenbergia virescens. The commonest of the herbaceous 

 perennials are low, small plants such as Hedeoma hyssopifolia, Hous- 

 tonia wrightii, POOL fendleriana, Calliandra reticulata, and Calliandra 

 humilis, or else they are somewhat taller but relatively inconspicuous, 

 as Pseudocymopterus montanus var. tenuifolius, Erigeron neomexicanus, 

 Litkospermum muliiflorum, Lotus puberulus, and others. In the dense 

 shade of the Upper Encinal Pteris aquilina var. pubescens is common, 

 and it again becomes common in the pines above 7,500 feet, but is infre- 

 quent in the lower portion of the forest region. 



The Pine Forest gives the impression of possessing a much richer 

 flora of herbaceous plants than is found in any other habitat of the 

 mountain. This impression is due to the fact that a large number of 

 species enter into the vegetation as very common components of it. 

 As there are almost no rare or infrequent species to be found in the 

 Pine Forest away from streams and springs, the total flora involved 

 is not so great as might be supposed on first examination. Following 

 is a list of the characteristic species found between 7,000 and 8,000 

 feet, the relative abundance of which is indicated by asterisks: 



Characteristic Herbaceous Plants of the Pine Forest. 



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Achillea lanulosa. 



Agastache pallidiflora. 



Anisolotus puberulus. 



Antennaria marginata. 



Anthericum torreyi. 



Apocynum scopulorum. 



Bidens sp. 



Brickellia grandiflora. 



Calliandra reticulata. 



Carpochoete bigelovii. 



Castilleja gloriosa. 



Cologania longifolia. 



Commelina dianthifolia. 



Desmodium arizonicum. 



Desmodium grahami. 



Dugaldia hoopesii. 



Erigeron macranthus. 



Erigeron neomexicanus. 



Eupatorium arizonicum. 



Eupatorium pauperculum. 



Eupatorium rothrockii. 



Geranium coespitosum. 



Gilia thurberi. 

 ** Gnaphalium decurrens. 

 ** Gnaphalium wrightii. 



Gomphocarpus hypoleucus. 



Hedeoma hyssopifolia. 



Hieracium discolor. 



Houstonia wrightii. 



Hymenopappus mexicanus. 



Ipomoea muricata. 



Koeleria cristata. 



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* Lathyrus graminifolius. 

 *** Lithospermum multiflorum. 

 *** Lupinus sp. 



Microstylis montana. 

 Monarda pectinala. 

 ** Monarda scabra. 

 *** Muhlenbergia virescens. 



* Muhlenbergia sp. 

 Oenothera hookeri. 

 Onosmodium thurberi. 

 Panicum bulbosum. 



** Pentstemon torreyi. 

 ** Perityle coronopifolia. 

 ** Phaseolus retusus. 



* Pinaropappus foliosus. 

 Poa fendleriana. 

 Potentilla subviscosa. 

 Pseudocymopterus montanus 



tenuifolius. 

 Pseudocymopterus montanus 



purpureus. 



Pteris aquilina var. pubescens. 

 Salvia arizonica. 

 Senecio neomexicanus. 

 Solidago bigelovii. 

 Solidago marshallii. 

 Stevia sp. 



Tradescantia pinetorum. 

 Trifolium pinetorum. 

 Vicia americana. 

 Woodsia mexicana. 



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4- T 



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var. 



var. 



