Helianthus. COMPOSITiE. 383 



Stem 3-5 feet high, slender, striate. Leaves 4-6 inches long and 1-3 inches wide, 

 green on both sides, but rather paler underneath ; the upper surface rough with very short 

 scattered hairs : petiole an inch or more in length, slightly winged. Heads terminating the 

 fastigiate branches. Scales of the involucre loose and spreading or recurved, often somewhat 

 falcate. Rays usually about 8, narrowly lanceolate, about an inch in length. Pappus of two 

 subulate chaffy awns. 



Banks of streams ; rather rare. August - September. 



4. Helianthus divaricatus, Linn. Small Rough-leaved Sunflower. 



Stem smooth and glaucous, simple or 2 - 3-forked above ; leaves opposite, ovate-lanceolate, 

 sessile, divaricate, rounded at the base, tapering to the point, 3-nerved, very rough above and 

 scabrous-pubescent underneath ; scales of the involucre lanceolate, acuminate^ ciliate, equaling 

 the disk ; rays 8-12. — Linn. sp. 2. p. 906 ; Bigel. ft. Bost. p. 315 ; Torr. compend. 

 p. 309 ; Darlingt. fl. Cest. p. 482 ; DC. prodr. 5. p. 587 ; Torr. ^ Gr. Jl. N. Am. 2. 

 p. 329. H. truncatus, Schwein. in Ell. sk. 2. p. 416. 



Root perennial. Stem 2-5 feet high, often purple, slender, finely striate. Leaves 3-5 

 inches long and an inch or more in breadth, rough with very short stiff hairs on the upper 

 surface, a little strigose on the veins underneath ; the base very obtuse and rounded. Heads 

 few (mostly 3 - 5), small, in a fastigiate corymb ; the peduncles hairy and rough. Rays 

 bright yellow. Pappus of two short subulate scales. 



Thickets and borders of woods ; common. August - September. 



5. Helianthus tuberosus, Linn. Jerusalem Artichoke. 



Root creeping, bearing an oblong tubercle ; stem erect, branching, rough ; leaves alternate, 

 petiolate, triplinerved, rough, serrate, the lower ones cordate-ovate , upper ones ovate, acumi- 

 nate ; petioles ciliate at the base ; scales of the involucre linear-lanceolate, cihate {DC). — 

 "Jacq. Vind. 2. t. 161 ;" Beck, hot. p. 203 ; Darlingt. fl. Cest. p. 484 ; DC. prodr. 5. p. 590. 



Stem 5-8 feet high, stout. Leaves 4-8 inches long and 3-4 inches wide, abruptly 

 contracted and cuneate at the base ; the lower ones opposite : petiole 1-3 inches long. 

 Heads of flowers rather large, on rough and hairy peduncles. Rays numerous, rather bright 

 yellow. Pappus of two subulate chaffy scales. 



Borders of fields, and in cultivated grounds ; almost naturalized in a few localities. August 

 - September. 



