9J4 FLORA. 



upper ones lanceolate, thick, pale green, scabrous on both sides, 3-nerved, sparingly 

 serrate, acuminate at the apex, abruptly narrowed at the base into short petioles, 

 the larger about I dm. long and 3 cm. wide; heads several, stout-peduncled, 8-9 

 cm. broad; bracts of the involucre lanceolate, acuminate, long-ciliate. Sand hill 

 region of central Neb. ; type, Rydberg No. 1767, from Middle Loup River, 

 Hooker Co. 



17. Helianthus grosseserratus Martens. Saw-Tooth Sunflower. (I. F. 

 t. 3909.) Perennial by fleshy roots and slender rootstocks; stems glabrous, 

 glaucous, branched above, 2-3 m. high, the branches usually strigose-pubescent; 

 leaves long- lanceolate, slender-petioled, long-acuminate, narrowed at the base, 

 sharply serrate, or merely denticulate, the uppermost entire, rough above, densely 

 puberulent or canescent beneath, 1-2 dm. long, 1-2.5 cm. wide; heads several or 

 numerous. 4-7 cm. broad; involucre hemispheric, 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 open places, eastern L. I. to Penn., S. Dak., Mo. 

 and Tex. May contain more than one species as here characterized. 



18. Helianthus Kellermani Britton, n. sp. Kellerman's Sunflower. Stem 

 2-3 m. high, very smooth, much branched above, the branches slender. Leaves 

 narrowly 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 pubescent on both 

 surfaces, pinnately veined, the lower about 2 dm. long and 1.5 cm. wide; branches 

 of the inflorescence pubescent; bracts of the involucre linear-lanceolate, about 1.5 

 cm. long, and 1.5 mm. wide at the base, ciliate, long-acuminate; rays golden- 

 yellow, 3-4 cm. long; chaff of the receptacle linear. Columbus, Ohio. W. A. 

 Kellerman, Sept. 5, 1898. 



19. Helianthus divaricatus L. Rough or Woodland Sunflower. 

 (I. F. f. 3910.) Perennial by slender rootstocks; stem glabrous throughout, or pu- 

 bescent at the summit, slender, 6-20 dm. high. Leaves usually all opposite, di- 

 varicate, lanceolate or ovate-lanceolate, firm, dentate or denticulate, 3-nerved, 

 rough above, pubescent beneath, gradually long-acuminate, 7-20 cm. long, 6-36 mm. 

 wide ; heads few or solitary, about 25 mm. broad, borne on strigose-pubescent 

 peduncles; involucre hemispheric, its bracts lanceolate or ovate-lanceolate, stri- 

 gose or hirsute, the outer ones spreading; rays 8-15; chaff of the receptacle apicu- 

 late; achenes glabrous; pappus of 2 short subulate awns. In dry woodlands, Me. 

 and Out. to the N. W. Terr., south to Fla., Neb. and La. July-Sept. 



20. Helianthus mollis Lam. Hairy Sunflower. (I. F. f. 3911.) Perennial, 

 stem stout, simple, or sparingly branched above, 6-12 dm. high. Leaves pinnately 

 veined, 3-nerved above the base, all opposite, or the upper alternate, acute or 

 acuminate, scabrous or cinereous pubescent above, densely and finely pubescent 

 beneath, serrulate, 5-12 cm. long, 2-6 cm. wide; heads solitary or few, 5-7 cm. 

 broad; involucre hemispheric, its bracts lanceolate, acuminate, densely villous- 

 canescent, somewhat spreading; rays 15-25: chaff canescent at the summit; ma- 

 ture achenes nearly glabrous; pappus of 2 lanceolate scales. In dry barren soil, 

 Ohio to Ga., west to Iowa. Kans., and Tex.; also on L. I. Aug.-Sept. 



21 Helianthus doronicoides Lam. Oblong-leaved Sunflower. (I. F. 

 f. 3912.) Perennial by slender rootstocks; stems stout, rough, or finely rough- 

 pubescent, branched above, 1-2 m. high. Leaves oblong, ovate-oblong, or ovate, 

 thick, ascending, serrate or serrulate, acute or acuminate at the apex, rough on 

 both sides, or finely pubescent beneath, somewhat 3-nerved, 1-2 dm. long. 2-6 

 cm. wide; heads commonly numerous, 6-iocm. broad; involucre hemispheric, its 

 bracts lanceolate, acuminate, pubescent or hirsute, somewhat spreading; rays 

 12-20, 8-12 mm. wide; achenes glabrous; pappus of 2 subulate awns. In dry soil, 

 Ohio to Mich.. Mo. and Ark. Aug.-Sept. 



22. Helianthus decapetalus L. Thin- leaved or Wild Sunflower. 

 (I. F. f. 3913.) Perennial by branched, sometimes thickened rootstocks; stem 

 slender. glabrous or nearly SO, branched above, 3 15 dm. high; branches puberu- 

 lent. Lea m. long, 4-7 cm. wide, ovate or ovate-lanceolate, the upper 

 Commonly alternate, roughish above, finely but often sparingly pubescent beneath, 

 acuminate, the rounded or truncate base decurrent on the petiole; heads numer- 



