250 BARTRAM: BOTANIZING IN SOUTHERN ARIZONA 
BACCHARIS GLUTINOSA Pers. Common along the banks of Rillito Creek. 
BACCHARIS SAROTHROIDES Gray. Abundant on the sand bars and 
banks = Rillito Creek. 
ERIGERON DIVERGENS Torr. & Gray. This is apparently an abnormal 
winter form of the species but very constant throughout the region. It is 
scattered freely over the rocky foothill slopes and flowers during January. 
GNAPHALIUM WriGHTII Gray. Frequent on arid rocky slopes. 
PARTHENIUM INCANUM H. B. K. A common low shrub of the foothills. 
In good conditions through the winter, 
CRASSINA PUMILA (Gray) Kuntze. Occurring sparingly on dry gravelly 
ENCELIA FARINOSA Gray. The distinctive gray color of many of the 
desert slopes is derived from the lustrous silvery leaves of this species. The 
showy yellow flowers are locally abundant, even in January, and it ma 
well be numbered among the most satisfying and attractive plants of the 
region. 
LEPTOSYNE ARIZONICA Gray. Bank of a stream in the mouth of Pima 
Canyon 
Poi: ROPHYLLUM JUNCIFORME Greene. A rush-like plant of ledges and 
rocky slopes in the foothills. 
DYSODIA POROPHYLLOIDES Gray. Rare on ledges near Picture Rocks. 
PsILOSTROPHE CoopErI (Gray) Greene. Fresh flowers among the 
) 
persistent papery old blooms are found sparingly in January. Frequent on 
the gravel plains. 
BAILEYA MULTIRADIATA Harv. & Gray. Frequent and showy 
sandy plains, especially along wiathaldes: Flowering freely by a January. 
PERITYLE DissEcTA Gray. An attractive little plant with curiously 
cleft leaves and persistent involucres. In rock clefts near the mouth of 
Pima Canyon. 
BAHIA DEALBATA Gray. Arroyos in the Tucson Mountains. 
ELENIUM MONTANUM Nutt. Localized along the bank of a stream 
east of the mouth of Pima Canyon 
ARTEMISIA ALBULA Wooton. Arid foothill slopes Abundant near 
Agua Caliente. 
ARTEMISIA Britton Rydb. Ledges in Sabino Canyon. 
BEBBIA JUNCEA (Benth.) Greene. An attractive slender stemmed 
plant of the sandy plains. 
ENECIO LEMMONI Gray. Flowering rather sparingly on rocky slopes 
in the foothills. 
CIRSIUM NEOMEXICANUM Gray. Infrequent along roadsides in the 
gravel plains. 
BUSHKILL, PENNSYLVANIA 
