Genus 66. THISTLE FAMILY. 485 
21. Helianthus tracheliifélius Mill, Throatwort 
Sunflower. Fig. 4481. 
Helianihaes tracheliifolius Mill. Gard. Dict. Ed. 8, No. 7. 
1768. 
Similar to the following species, but the stem usually 
roughish-pubescent above. Leaves short-petioled, ovate- 
lanceolate, or lanceolate, 3-nerved, green both sides, but 
darker above, generally rougher on the upper surface, 
the lower ones sharply serrate; branches and peduncles 
scabrous; heads several, 23’-32’ broad; bracts of the 
hemispheric involucre linear-lanceolate, long-acuminate, 
ciliate and puberulent, longer than the yellow disk, 
sometimes foliaceous, and 3 times its length. 
In dry soil, Connecticut to Pennsylvania, North Carolina, 
Ohio, Minnesota and Arkansas. Aug.—Sept. 
22. Helianthus strumdsus L. Pale-leaved 
Wood Sunflower. Fig. 4482. 
Hehanthus strumosus L. Sp. Pl. 905. 1753. 
HI, mollis Willd. Sp. Pl. 3: 2240. 1804. Not Lam. 1789. 
Hi macrophyllus Willd. Hort. Berol. pl. 70. 1806. 
Perennial by branched, sometimes tuberous-thick- 
ened rootstocks; stem glabrous below, sometimes 
glaucous, 3°-7° high, branched above, the branches 
usually pubescent. Leaves short-petioled, ovate or 
ovate-lanceolate, rarely lanceolate, not membranous, 
rough above, pale and somewhat puberulent or ca- 
nescent beneath, serrate, serrulate, or nearly entire, 
acuminate, contracted much below the middle and 
decurrent on the petiole, 3-nerved above the base, 
3-8’ long, 1’-24’ wide, mostly opposite, the upper 
often alternate; heads commonly several, 23’—4’ 
broad; involucre hemispheric, its bracts lanceolate 
or ovate-lanceolate, acuminate, ciliate, equalling or 
a little longer than the diameter of the yellow disk; 
rays 5-15; chaff pubescent; achenes nearly glabrous. 
In dry woods and on banks, Maine and Ontario to 
Minnesota, Georgia, Tennessee and Arkansas. July— 
Sept. Races differ in leaf-form and texture. A hybrid 
with H. decapetalus has been described. 
23. Helianthus hirsitus Raf. Stiff-haired 
Sunflower. Fig. 4483. 
Helianthus hirsutus Raf. Ann. Nat. 14. 1820. 
Helianthus hirsutus trachyphyllus T. & G. FI. N. A. 2: 
329. 1842, 
Perennial; stem densely hirsute, usually branched 
above, stout, rigid, 2°-4° high. Leaves ovate-lanceo- 
late or the upper lanceolate, rounded, truncate or 
subcordate at the base, acuminate at the apex, thick, 
very rough above, rough-pubescent beneath, 3-nerved, 
serrate or serrulate, 3-6’ long, 2-2’ wide, short- 
petioled, or the uppermost sessile, nearly all oppo- 
site, the petioles of the lower ones 3’-?’ long; heads 
usually several, 2’-34’ broad; involucre hemispheric, 
its bracts lanceolate, or ovate-lanceolate, acuminate, 
ciliate, mostly puberulent, erect or somewhat spread- 
ing, equalling or shorter than the yellow disk; rays 
12-15; chaff obtusish, pubescent at the summit; 
achenes oval, rounded at the summit, glabrous; 
pappus of I or 2 subulate awns. 
In dry soil, Pennsylvania and Ohio to Wisconsin, Ne- 
braska, West Virginia, Georgia and Texas. July—Oct. 
