486 COMPOSITAE, Vou. III. 
24. Helianthus laetiflorus Pers. Showy Sun- 
flower. Fig. 4484. 
AN 
SN 
4) ao 
4 ime —— Helianthus laetiflorus Pers. Syn. 2: 476. 1807. 
RS 
Perennial; stem scabrous or hispid, leafy, 4°-8° high. 
Leaves oval-lanceolate or ovate-lanceolate, short-peti- 
oled, 3-nerved, rough on both sides, narrrowed at the 
base, acute or acuminate at the apex, serrate or serru- 
late, 4’-10’ long, 3’-12’ wide, the upper often alter- 
nate; heads usually several, 2-4’ broad, mostly short- 
peduncled; bracts of the hemispheric involucre ovate- 
lanceolate, or oblong-lanceolate, imbricated in only 2 or 
3 series, ciliate, otherwise nearly glabrous, appressed or 
but little spreading, shorter than or equalling the yellow 
disk; rays 15-25, showy; chaff of the receptacle entire, 
or sometimes 3-toothed. 
On prairies and barrens, Pennsylvania to Minnesota. Re- 
corded as adventive in Massachusetts. Aug.—Sept. 
25. Helianthus tomentésus Michx. Woolly 
Sunflower. Fig. 4485. 
H. tomentosus Michx. Fl. Bor. Am. 2: 141. 1803. 
Perennial; stem stout, hirsute or hispid, especially 
above, branched, 4°-10° high. Leaves rather thin, 
ovate, or the lower oblong, mostly alternate, 3-ribbed 
above the base, gradually or abruptly contracted into 
margined petioles, rough above, softly villous-pubes- 
cent beneath, sparingly serrate, the lower often 1° 
long and 4’ wide; heads commonly several or. nu- 
merous, 3-4’ broad; involucre hemispheric, its bracts 
imbricated in many series, linear-lanceolate, long- 
acuminate, squarrose, densely hirsute and ciliate, 
usually longer than the broad yellowish disk; chaff 
of the receptacle and lobes of the disk corolla pubes- 
cent; pappus of 2 subulate awns. 
In dry soil, Virginia to Georgia and Alabama. Re- 
ported from Illinois, probably erroneously. Aug.—Oct. 
el 
NY 
26. Helianthus tuberésus L. Jerusalem Arti- 
choke. Earth Apple. Fig. 4486. 
Helianthus tuberosus L. Sp. Pl. 905. 1753. 
Helianthus tuberosus subcanescens A, Gray, Syn. Fl. 1: 
Part 2, 280. 1884. 
Perennial by fleshy thickened rootstocks, bearing 
tubers; stems hirsute or pubescent, branched above, 
6°-12° high. Leaves ovate or ovate-oblong, rarely 
ovate-lanceolate, firm, 3-nerved near the base, nar- 
rowed, or the lower rounded, truncate or subcordate 
at the base, acuminate at the apex, rather long- 
petioled, scabrous above, finely pubescent or canes- 
cent beneath, serrate, 4-8’ long, 14’-3’ wide, the up- 
per alternate, the lower opposite; heads several or 
numerous, 2-34’ broad; involucre hemispheric, its 
bracts lanceolate, acuminate, hirsute or ciliate, squar- 
rose; disk yellow; rays 12-20; chaff of the receptacle 
acute and pubescent at the summit; achenes pubescent. 
In moist soil, Nova Scotia and Ontario to Manitoba, 
Georgia and Arkansas and Kansas. Often occurs along 
roadsides in the east, a relic of cultivation by the abo- 
rigines. Now extensively grown for its edible tubers. 
Canada potato. Girasole. Topinambour. Sept.—Oct. 
67. RIDAN Adans. Fam. Pl. 2: 130. 1763. 
[Actinomeris Nutt. Gen. 2: 181. 1818.] 
Rough-pubescent, rather coarse, herbs with alternate or opposite, simple, more or less 
toothed leaves, usually decurrent on the stem and branches, and corymbose, radiate or discoid 
