FIFTEENTH REPORT. 
208 
ff. Involucre 3-6 mm. long'. 
g- Racemes or branches of the panicle either short and 
arranged along a more or less elongated central axis, 
or elongated and ascending, scarcely recurved, form- 
ing a narrow, more or less elongated panicle (cylin- 
drical or tliyrsoid type), (compare with a.) ; leaves 
entire or nearly so. (dry, open ground) 
S. -speciosa , v. angustata 
gg. Racemes or branches of Ihe panicle usually elongated, 
spreading outwards, usually recurved, forming a 
widened panicle (pyramidal type) ; leaves distinctly 
serrate. 
h. Leaves pinnately veined, (dry woods) .S. ulmifolia 
hh. Leaves 3-5-ribbed. 
i. Leaves glabrous both sides, (moist, rich soil) .... 
S. serotina 
ii. Leaves slightly pubescent beneath, (low ground) 
&. serotina , v. gig anted 
