2 H. debilis Nutt. Decumbent, slender; lvs. ovate, serrulate, petiolate, mostly alternate; hds. small, solitary, pedunculate ; scales narrow, slender-pointed; ach. pubescent. - (J) Fla., La. (Not within our limits ?). Sts. 1 to 2f long. Hds. half an inch diam. Rays about 12.
3 H. Radula Torr. & Gr. Erect, hirsute, simple, bearing a single head; lvs. sessile or nearly so, roundish obovate or ovate, obtuse, opposite, crowded below; scales and pales lanceolate, acuminate, erect, dark purple; rays 7 to 10, rarely none. -Ц Barrens, Ga., Ala., Fla. St3. often clustered, 1 to 3f high. Lvs. very rough on the upper surface. Hds. near 1' diam., disk dark purple. Aug., Sept † (Rudbeekia, Ph.)
4 H. heterophyllus Nutt. Slightly hispid, slender, bearing a single head; lvs. opposite, entire, subsessile, the lower oval, upper linear-lanceolate, scales acuminate, erect, ciliate; pales acute; rays 12 to 18. - Ц N. Car. to Fla. and La. St. 1 to 2f high. Hds. 6 ' diam., rays expanding 2 1/2'. Aug., Sept.
5 H. angustifolius L. Erect, slender, scabrous or hispidly hirsute; lvs. sessile, lance-linear, tapering to a long point, 1-veiued, rigid, opposite, the upper often alternate, subdenticulate, often revolute; hds. pedunculate, few t scales lance-linear, the long point spreading; pales linear, 3-toothed. - Sandy or rocky places, N. J., Ky., and S. States, common. St. 2 to 3f high, subsimple. Lvs. 2 to 6' by 3 to 6", broadest at the abrupt base. Rays 12 to 18, expanding about 2 . Disk flowers brown at the summit. Aug. - Oct
6 H. rigidus Desf. St. rigid, simple or with few branches, scabrous or smooth-ish, nearly naked above; lvs. lanceolate, tapering to each end, petiolate, mostly opposite, tripli-veined, serrulate or entire, rigid, scabrous both sides; hds. few; scales in many rows ovate, acute, regularly imbricate, shorter than the disk; pales obtusish. - Prairies, etc, Wis. (Lapham), to Mo., La., etc. Plant 2 to 4f high. Lvs. 3 to 6' by 1/2 to 1', very rough with papillous hairs, but less so than H. divari-catus. Rays 12 to 20, expanding 2 to 3", light yellow. (H. scaberrimus Ell.)
7 H. atrorubens L. St. with few long, naked peduncles above, hirsute below: lvs. ovate, or oval, obtusish, abruptly contracted into winged petioles, subserrate. rough or hispid, 3-veined; scales obovate or oblong, obtuse, 3-veined, about equaling the disk; pales obtusish. - Dry soils, Va. to Fla. and Ark. St. 2 to 4f high. Lvs. mostly near the base, large. Hds. small, few, with 12 to 15 rays, 9 to 10" long. Aug. - Oct.
8 H. giganteus L. St. rough, hairy lvs., alternate (the lowest opposite), lanceolate, acuminate, serrate, scabrous, obscurely 3-veined, tapering at base into short, ciliate, winged petioles; scales lanceolate-linear, ciliate; pappus of 2 short, slightly fringed scales. - Can. to Car. and Ky., in low grounds and thickets. Stem 4 - 8f high, purplish, branching above into a corymbous panicle of large, yellow flowers. Leaves 2 - 5' by 1/2- 1', opposite or alternate in various degrees. Rays 12 - 20. Variable.
"ß. ambiguus. Lvs. nearly all opposite, sessile and rounded at base." - L. I. (T. & G.)
9 H. tomentosus Mx. St. stout, pubescent, branched above; lvs. mostly alternate, acuminate, nearly entire, scabrous above, tomentous or nearly glabrous beneath, lower ones ovate, petiolate, upper long-lanceolate, subsessile; hds. long-pedunculate ; scales lance-linear, long-acuminate, villous, squarrous; chaff 3-toothed, hirsute at summit. - Dry soils, I11. to Ga. Plant 4 to 8f high, with ample lvs. and fls. Lvs. 6 to 12' by 2 to 6', some of them triph-veined. Rays elliptical lanceolate, about 15" long. Aug. - Oct. †
ß. Lvs. oval, mostly opposite. - Ga. (H. spatulatus Ell.;
10 H. grosse-serratus Martens. St. smooth and glaucous; lvs. mostly alternate, lanceolate, or lance-ovate, long-acuminate, sharply serrate, scabrous above, hoary and softly pubescent beneath, abruptly contracted into naked petioles; scales lance-subulate, loosely imbricated, sparingly ciliate, as long as the disk. - Ohio, Ind., I11., to La. Allied to H. giganteus. St. 4 to 6f high. Lvs. 6 to 9' by 1 to 2', broadest near the base, lower ones rather coarsely serrate. Rays 15 to 20, expanding near 3'. Aug., Sept.
11 H. tuberdsus L. Jerusalem Artichoke. Boot bearing oblong tubers; lvs. 3-veined, rough, lower ones opposite, cordate-ovate, upper ovate, acuminate, alternate; petioles ciliate at base. - Ц Native of Brazil. The plant has been cultivated for the sake of its tuberous roots, which are used for pickles. It is naturalized in borders of lields, hedges, etc. Sept.
12 H. laetifldrus Pers. St. rough and branched above; lvs. oval-lanceolate, acuminate, serrate, tripli-veined, very rough on both sides, on short petioles, upper ones often alternate; scales ovate-lanceolate, ciliate, appressed, a little shorter than the disk; chaff entire or 3-toothed; rays 12 to 20. - Barrens, etc., Ind., Ohio (Torr. & Gr.) A rough, but showy plant, 3 to 4f high. Lvs. thick, 5 to 8' by 1 1/2 to 2 1/2'. Rays nearly 2' in length. Disk yellow. Aug. - Oct. †
13 H. occidentals Riddell. St. slender, simple, nearly naked above; lvs. opposite, oval, scabrous, obscurely serrate, contracted at base into long, hairy petioles, upper ones small and few, entire; hds. pedunculate; scales lance-oval, appressed. Sand prairies, W. States. St. 3 to 5f high, scape-like, slender. Lvs. 3 to 5' by 1 to 2', upper ones 1 to 2' long. Hds. few, middle size. Rays 12 to 15, light yellow. Jl. - Sept. †
14 H. mollis Lam. St. villous; lvs. ovate, acuminate, sessile, cordate and clasping, entire or subserrate, tomentous canescent, opposite, upper ones sometimes alternate ; scales lanceolate, villous canescent; pales entire, acute and canescent above. Prairies and barrens, Ohio, Ind., Mo., common. A hoary and villous species, 2 to 4f high, nearly simple. Lvs. 3 to 5' long, 1/2. to 3/4 as wide. Rays 15 to 25, 1/2 to 1' by 1/4'. Jl - Sept. (H. canescens Mx.)