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IOWA ACADEMY OF SCIENCE Vor. XXIX, 1922 
Fig. 6. The big tree (Sequoia Washingtonia) in the Yosemite National Park, 
Mariposa Grove 
species. The white flowered smart weed ( Polygonum bistorta ) is 
Tarely found though it is said to have been common at one time. 
The large yellow flowered evening primrose (, Oenothera grandi- 
dora) is abundant, and the large yellow flowers form an inter- 
esting feature of the region. Several species of Gayophytum are 
