286 BOTANICAL GAZETTE [OCTOBER 
might be inferred, passes as the open formation gradually becomes 
closed, never being present in a compact sod at the base of the slope. 
Appearing with S. missouriensis comes H. scaberrimus. It occurs 
both more frequently and abundantly than the former and is dis- 
tinctly less xerophytic, reaching its greatest abundance upon middle 
and upper slopes. Its rigid, rough, and little-branched shoots, 
rising some 1.5™ and terminated by a spreading corymb bearing 
‘ : ‘ sg . imus on 
Fic. 2.—Late serotinal aspect: Solidago rigida and Helianthus scaberrimus 
upper slope. 
few conspicuous heads (3 to 5°™ wide) with numerous yellow tay® 
make it a conspicuous element of the early autumnal aspect, oe : 
soon blends in the sea of yellow of Solidago rigida, which shortly 
comes on, completely dominating the floral tone. cameeest 
(fig. 2) rarely holds its own along the tension line where the Poa “t 
is encroaching, but with other open association forms yields to = 
advancement, though it occurs inclusively in the less compact S0°* 
higher up the slopes, in which places it frequently assumes 4 meas 
gregarious habit. The stiff sunflower is perennial by 4 thick 10 
