32 VEGETATION OF A DESERT MOUNTAIN RANGE. 
are the low thorny shrub Ceanothus fendlert, 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, Poa fendleriana, Calliandra reticulata, and Calliandra 
humilis, or else they are somewhat taller but relatively inconspicuous, 
as Pseudocymopterus montanus var. tenuifolius, Erigeron neomexicanus, 
Lithospermum multiflorum, Lotus puberulus, and others. In the dense 
shade of the Upper Encinal Pieris 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. 
*** Achillea lanulosa. 
* Agastache pallidiflora. 
** Anisolotus puberulus. 
** Antennaria marginata. 
* Anthericum torreyt. 
*** Anocynum scopulorum. 
* Bidens sp. 
** Brickellia grandiflora. 
*** Calliandra reticulata. 
** Carpochete bigelovit. 
*** Castilleja gloriosa. 
*** Cologania longifolia. 
** Commelina dianthifolia. 
* Desmodium arizonicum. 
* Desmodium grahami. 
*** Dugaldia hoopesii. 
*** Brigeron macranthus. 
*4* Hrigeron neomexicanus. 
** Hupatorium arizonicum. 
* Hupatorium pauperculum. 
* Eupatorium rothrockii. 
** Geranium cespitosum. 
** Gilia thurberi. 
** Gnaphalium decurrens. 
** Gnaphalium wrightit. 
** Gomphocarpus hypoleucus. 
*** Hedeoma hyssopifolia. 
** Hieracium discolor. 
*** Houstonia wrightii. 
*** Hymenopappus mexicanus. 
* Ipomoea muricata. 
*** Keleria cristata. 
*** Lathyrus graminifolius. 
** Tithospermum multiflorum. 
*** Trpinus sp. : 
** Microstylis montana. 
*** Monarda pectinata. 
** Monarda scabra. 
«** Muhlenbergia virescens. 
* Muhlenbergia sp. 
** O5enothera hookeri. 
** Onosmodium thurbert. 
** Panicum bulbosum. 
** Pentstemon torreyt. 
** 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 marshallit. 
“** Stevia sp. 
* Tradescantia pinetorum. 
** Trifolium pinetorum. 
** Vicia americana. 
** Woodsia mexicana. 
var. 
var. 
