GENUS 66. THISTLE FAMILY. 
15. Helianthus grdésse-serratus Martens. 
Saw-tooth Sunflower. Fig. 4475. 
Helianthus grosse-serratus Martens, Sel. Sem, Hort. 
Loven. 1839. 
Perennial by fleshy roots and slender rootstocks ; 
stems glabrous, glaucous, branched above, 6°-10° 
high, the branches usually strigose-pubescent. Leaves 
long-lanceolate, slender-petioled, the upper alternate, 
the lower opposite, long-acuminate, narrowed at the 
base, sharply serrate, or merely denticulate, the up- 
permost entire, rough above, densely puberulent or 
canescent beneath, 4’-8’ long, 3’-1’ wide; heads sev- 
eral or numerous, 14’-3’ broad; involucre hemi- 
spheric, its bracts squarrose, narrowly lanceolate, 
acuminate, hirsute; chaff linear-oblong, pubescent at 
the summit, acute, often 3-toothed; disk yellowish; 
rays 10-20, deep yellow; achenes nearly glabrous; 
pappus of 2 lanceolate awns. ‘ 
In dry soil, Maine to Long Island, Pennsylvania, On- 
ae South Dakota, Missouri, Kansas and Texas. Aug.— 
ct. e 
16. Helianthus Kellermani Britton 
Kellerman’s Sunflower. Fig. 4476. 
Helianthus Kellermani Britton, Manual 994. 1901. 
Stem 6°-10° high, very smooth, much branch- 
ed above, the branches slender. Leaves nar- 
rowly elongated-lanceolate to linear-lanceolate, 
drooping, rather thin, distantly serrate with 
very small teeth, long-acuminate at the apex, 
attenuate at the base into short petioles or the 
upper sessile, scabrate and sparingly pubes- 
cent on both surfaces, pinnately veined, the 
lower about 8’ long and 7” wide; branches of 
the inflorescence pubescent; bracts of the in- 
volucre linear-lanceolate, about 7” long, and 1” 
wide or less at the base, ciliate, long-acumi- 
nate; rays golden-yellow, 1-12 long; chaff of 
the receptacle linear. 
Sept. 
17. Helianthus divaricatus L. Rough or 
Woodland Sunflower. Fig. 4477. 
Helianthus divaricatus L. Sp. Pl. 906. 1753. 
Perennial by slender rootstocks; stem glabrous 
throughout, or pubescent at the summit, slender, 
2°-7° high. Leaves usually all opposite, divaricate, . 
lanceolate or ovate-lanceolate, firm, dentate or den- 
ticulate, 3-nerved, rough above, pubescent beneath, 
sessile or nearly so by a truncate base, tapering 
gradually to the long-acuminate apex, 3-8’ long, 
#’-13’ wide; heads few or solitary, about 2’ broad, 
borne on strigose-pubescent peduncles; involucre 
hemispheric, its bracts lanceolate or ovate-lanceo- 
late, strigose or hirsute, the outer ones spreading; 
disk yellow; rays 8-15; chaff of the receptacle 
apiculate; achenes glabrous; pappus of 2 short 
subulate awns. 
In dry woodlands, Maine and Ontario to Manitoba, 
Nebraska, Florida and Louisiana. July—Sept. 
Dry soil, vicinity of Columbus, Ohio. 
