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[[blank page]] [[end page]] [[start page]] to 6000 or more. It is marked by yellow pine, over the slopes and foothills Arctostaphylos uva-ursa, [[?]] saggitifolia, and in part by Pseudotsuga. Populus augustifolia grows along the streams up to 5000 feet when it joins tremuloides. The pen valley country is mainly Transition with a strong tinge of [[underlined]] Upper Sonoran [[/underlined]] species, such as Clove integrifolia, Eurotia lanata, Artemisia lava, Hilianthus annuus, Ambrosia trilobata, [[?]] missouriensis, [[Ocygopsis?]] micrantha, & others that belong to both zones. The Transition zone valley species are Artemisia frigida, & ludoviciana (white leaf form),