FLORA OF YO SEMITE 
255 
is also shepherd’s purse ( Capsella bursa- past oris) , radish ( Raph - 
anus sativus) and the tumbling mustard ( Sisymbrium altissimum ) . 
Streptanthus orbiculatus occurs in the Yosemite Valley. The Cali- 
fornia poppy ( Bschscholtzia Californica) of the family Papaver- 
aceae grows as freely in the Yosemite as in other parts of Cali- 
fornia. The California strawberry bush ( Calycanthus occiden- 
talis) of the Calycanthaceae is common in moist canyons and 
streams and is found in the lower Merced between El Portal and 
the lodge. There are also representatives of Aquilegia, Delphin- 
ium, Clematis ( C . ligusticif olia) , Thalictrum, Spatter dock ( Nu - 
phar polysepalum) , Arenaria, Silene, Aster, Brigeron, Juncus, 
Carex, Scirpus . There are several interesting mistletoes. The 
incense cedar mistletoe ( Phoradendron Libocedri ) was frequently 
observed on the road to Wawona from the Yosemite Valley. The 
oak mistletoe. ( Phoradendron villosum) is common on several 
species of oaks in the Merced Canyon between El Portal and the 
Yosemite and on 'the Wawona road from the valley, especially 
on Quercus chrysolepis and Q. Californica. The cottonwood 
mistletoe ( Phoradendron davescens ) is often found on the cotton- 
wood in the San Joaquin Valley. The Arceuthobium occidental 
is fairly common on the yellow pine in the Yosemite Valley. 
Department oe Botany, 
Iowa State College. 
