328 



COMPOSITAE. 



[Vol. in. 



19. ERIOCARPUM Nutt. Trans. Am. Phil. Soc. (II) 7: 320. 1S41. 



Perennial or annual herbs or shrubs with alternate spinulose-dentate or lobeil leaves and 

 many-flowered heads of tubular or of both tubular and radiate yellow flowers (heads 

 rarely without rays). Involucre hemispheric to campanulate, its bracts imbricated in several 

 series, the outer ones gradually smaller. Receptacle flat or convex, generally foveolate, 

 naked. Ray-flowers fertile. Disk-flowers usually perfect. Anthers obtuse and entire at the 

 base. Style-branches flattened, their appendages short, lanceolate. Achenes oblong or 

 obovoid, obtuse, white-tomentose, or canescent, usually S-io-nerved. Pappus of l-^ series of 

 numerous capillary persistent more or less unequal bristles. [Greek, woolly fruit.] 



About 10 species, natives of America, 

 em parts of the United States. 



Rays none; leaves dentate. 

 Rays present. 



Leaves dentate: annual. 



Leaves pinnatifid; perennial. 



Besides the following, about 6 others occur in the west- 



I. E. spiiidelioides. 



2. E. rubiginosum. 



3. E. spinulosum. 



I. Eriocarpum grindelioides Xutt. 

 Rayless Eriocarpum. (Fig. 3666.) 



Eiiocaipum grindelioides a-aXX.Tra.ns. \ra. Phil. Soc. 

 (11)7.321. 1841. 



Aplopappus XullaUii T. & G. Fl. N. A. 2: 240. 1S42. 



Perennial by a deep woody root, finely pubescent; 

 stems tufted, simple, erect, 4'-l2' high. Leaves 

 oblong-lanceolate to spatulate, sessile, or the lower 

 petioled, yi'-'i' long, firm, acute or obtusish, 

 spinulose-dentate; heads several or solitary, termi- 

 nating the stem or branches; peduncles i' long, or 

 less; involucre campanulate, its bracts linear, acute, 

 puberulent, their tips somewhat spreading, the outer 

 shorter than the inner; achenes densely silky to- 

 mentose. 



In dry soil. Northwest Territory to South Dakota, 

 Nebraska, Utah and Arizona. July.-Aug. 



2. Eriocarpum rubiginosum (T. & G.) Britton. Viscid Eriocarpum. 

 (Fig. 3667.) 



Aplopappus rubiginostis T. &. G. Fl. N. A. 2: 

 240. 1 84 1. 



Eriocarpum rubis^inosum Britton, Mem. Torr. 

 Club, 5: 316. 1S94. 



Viscid, glandular-pubescent, erect, an- 

 nual, branched near the summit, i°-3° high. 

 Leaves sessile, or the lowest narrowed into 

 short petioles, oblong, lanceolate, or 

 oblanceolate, conspicuously dentate with 

 distant awn-pointed teeth, acute or obtusish 

 at the apex, i^'-2^' long, 2"-6" wide; 

 heads several, cymose-pauiculate, S^-is" 

 broad; involucre hemispheric, its bracts 

 linear-subulate with spreading tips; rays 

 large; pappus bristles rigid, very unequal; 

 achenes villous-canescent, turbinate, not 

 compressed. 



Nebraska and Colorado to Texas. Autumn. 



