920 FLORA. 



x. Elephantopus Carolinianus Willd. Carolina Elephant's-foot. (I. F. 

 f. 3609.) Erect, hirsute-pubescent, or glabrate above, branched above, 3-9 dm. 

 high. Leaves oval, ovate* or obovate, thin, the lower ratlier abruptly narrowed 

 into margined petioles, obtuse, crenate-dentate, 7-20 cm. long, 5 10 cm. wide, the 

 upper smaller, narrower and sessile; glomerules, including the bracts, nearly 25 

 mm. broad; scales of the pappus lanceolate-subulate, gradually narrowed into a 

 long slender awn. In dry woods, southern N. J. and Penn. to Ela., Kans. and 

 Tex. Aug. -Sept. 



2. Elephantopus nudatus A. Gray. Smoothish Elephant's-foot. (I. F. 

 f. 3610.) Erect, rather stout, appressed-pubescent, or glabrate, 3-6 dm. high. 

 Leaves obtuse at the apex, gradually narrowed at the base, crenate or repand, 

 5-25 cm. long, the basal ones usually much larger than those of the stem and 

 branches, or these usually few and bract like; glomerules 12-18 mm. broad; scales 

 of the pappus ovate-triangular, abruptly narrowed into the awn. In sandy 

 woods, Del. to Ela., west to Ark. and La. Aug. -Sept. 



3. Elephantopus tomentosus L. Woolly Elephant's-foot. Tobacco- 

 weed. (I. E. f. 361 1.) Erect, villous-pubescent, or sometimes glabrate, 3-6 dm. 

 high, the stem branching above, leafless or with 1 or 2 leaves Basal leaves 

 narrowed at the base, usually silky- pubescent beneath, crenate-dentate, 10-22 cm. 

 long; glomerules 2.5-4 cm. broad; scales of the pappus triangular-subulate, gradu- 

 ally narrowed into the awn. In moist soil, Va. to Fla., west to Ky., Ark. and 

 La. Aug. -Sept. 



3. SCLEROLEPIS Cass. 



Slender aquatic herbs, with linear entire verticillate leaves, and solitary (rarely 

 2-4) discoid peduncled terminal heads of small purplish flowers. Involucre broadly 

 campanulate or hemispheric. Bracts imbricated in about 2 series. Receptacle 

 conic, naked. Corolla regular, its tube short, its limb campanulate, 5-lobed. 

 Anthers obtuse at the base. Style-branches slender, obtuse. Pappus of 5 broad 

 cartilaginous obtuse scales. Achenes 5-angled. [Greek, hard scale, referring to 

 the pappus. ] A' monotypic genus. 



1. Sclerolepis uniflora (Walt.) Porter. Sclerolepis. (I. F. f. 3612.) Per- 

 ennial; stem simple, decumbent at the base, erect or ascending, glabrous or slight- 

 ly pubescent, 3-6 dm. long, leafy. Leaves sessile, verticillate in 4's-6's, linear, 

 I -nerved, 8-25 mm. long, 1-2 mm. wide, or the submerged ones filiform; head 

 about I cm. broad; bracts of the involucre linear-oblong, acutish, usually puber- 

 ulent. In shallow ponds and streams, pine barrens of N. J. to Fla. July-Sept. 



4. EUPATORIUM L. 

 Erect, perennial herbs, with opposite or verticillate, or sometimes alternate, 

 often punctate leaves, and in our species cymose-paniculate discoid heads of white, 

 blue or purple flowers. Involucre oblong, ovoid, campanulate, or hemispheric, the 

 bracts imbricated in 2-several series. Receptacle naked. Corolla regular, its 

 tube slender, its limb 5-lobed or 5-toothed. Anthers obtuse and entire at the base, 

 appendiculate at the apex. Style-branches elongated, flattened, or thickened above, 

 stigmatic at the base. Achenes 5-angled, truncate. Pappus of numerous capillary 

 usually scabrous bristles arranged in I row. [Named for Mithridates F.upator, i.e., 

 ot ;i noble hither.] About 475 species, mostly of warm or tropical regions. Be- 

 sides the following, some 35 others occur in southern and western N. A. 



* Leaves alternate, pinnatifid into filiform segments. I. E. capillifolium. 



* * Leaves petioled, verticillate in 3's-6's, or the upper opposite. 

 Leaves rugose, pubescent; inflorescence depressed. 



Leaves ovate, acute. 2. E. maculatum. 



Leaves Lanceolate, long-acuminate. 3. E. Rydbergi. 



Leaves nearly glabrous; inflorescence pyramidal. 



Leaves sharply senate. 4. E. purpureum. 



Leaves crenate, the teeth apiculate. 5. E. trifoliatum. 



* * * Leaves opposite (rarely in 3's), or the uppermost alternate. 



t Involucral bracts imbricated in 2 or more series, the outer shorter. 



1. Leaves, al least the lower, slender-petioled. 6. E. serotinum. 

 a. Leaves all sessile, short-petioled or connate-perfoliate. 

 a. Leaves not clasping nor ronnate-perfoliate. 

 § Lgaves narrowed at the base. 



