lute maxima recorded at Moscow vary from 98° to 100° F.; at Port Hill 
from 91° to 100° F.; at Murray, from 97° to 99° F. Within the Clear- 
water c@nyon much higher maxima occur. For the region as a whole, the 
mean temperature for July varies from 80° to 85°; for January the mean 
minima vary from 14° to 20° F. 
LOWLAND VEGETATION 
In the lowland, particularly of the Palovse region, the ter- 
rain is largely under cultivation to various grains, especially to 
wheat, and the natural cover is restricted to small water courses and 
the margins of roads. 
RIPARIAN 
Along watercourses the dominant shrubs are: Salix Bebbiana, S. bella, 
S. lasiandra, Alnus tenuifolia, Rubus parviflorus, AmeJanchier florida, 
Crataegus Douglasii, Rosa nutkana, R. ultramontana, Sambucus glauca, 
Physocarpus pauciflorus, P. capitatus, Symphoricarpus albus, Philadel- 
phus Lewisii and frequently Prunus virginiana var. demissa and P. emar- 
ginata. Ribes lacustre, inerme, irriguum, and petiolare are frequent. 
In well-drained meadows and abundent locally is Lupinus retrorsus, 
giving a characteristic aspect to the herbage. 
In the lower ground, Iris missouriensis is a frequent conspicuous plant 
extending as far east as Boville. Numerous grasses and sedges, both 
native and introduced, are intermixed with the herbaceous vegetation 
of the meadowland. 
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