COMPOSITAE. 929 



the upper entire, 2-5 cm. long. 4-10 mm. wide; bracts of the involucre linear- 

 subulate, the inner erect, the outer spreading; pappus of I or 2 awns. In dry soil, 

 Tenn. to Kans., La. and Tex. July-Sept. 



13. HETEROTHECA Cass. 



Erect, hirsute or pubescent herbs, with alternate, mostly dentate leaves, and 

 rather large heads of both discoid and radiate yellow flowers, generally solitary at 

 the ends of the branches. Involucre hemispheric or broadly campanulate, its 

 bracts imbricated in several series, the outer shorter. Receptacle flat, alveolate. 

 Ray-flowers pistillate. Disk-flowers perfect, or some of them only staminate. 

 Style-branches flat, their appendages lanceolate or triangular. Achenes pubescent, 

 obtuse, those of the ray-flowers thick, those of the disk-flowers flattened. Pappus 

 of the ray. flowers obsolete or of a few caducous bristles, that of the disk-flowers of 

 an inner row of numerous capillary rough bristles, and an outer row of shorter 

 stouter bristles or scales. [Greek, different-case, from the dissimilar achenes.] 

 Five or 6 species of the southern U. S. and Mex. 



1. Heterotheca subaxillaris (Lam.) Britt. & Rusby. Heterotheca. 

 (I. F. f. 3651.) Biennial or sometimes annual, 3-9 dm. high. Basal and lower 

 leaves petioled, ovate or oblong, 5-7 cm. long, the upper ones oblong, sessile or 

 clasping, smaller, all acutish or obtuse, dentate; heads rather numerous, 12-18 

 mm. broad; involucre nearly hemispheric, 6-10 mm. high, its bracts linear, or 

 slightly dilated above, the inner with scarious margins; rays 10-25 ; inner bristles 

 of the pappus of the disk-flowers about 4 mm. long. In dry soil, Del. to Fla., La., 

 Kans., Ariz, and Mex. July-Sept. \H. Lamar ckii Cass.] 



14. CHRYSOPSIS Nutt. 



Perennial herbs, with alternate sessile entire leaves, or the basal ones dentate, 

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

 wanting in some western species), loosely corymbose, or solitary at the ends of the 

 branches. Involucre campanulate to hemispheric, its bracts narrow, imbricated in 

 several series, the outer shorter. Receptacle usually flat, foveolate. Ray-flowers 

 pistillate. Disk-flowers mostly all perfect. Pappus double in both the disk- and 

 ray-flowers, the inner of numerous rough capillary bristles, the outer of smaller or 

 minute scales or bristles. Achenes flattened, oblong-linear or obovate. Style- 

 branches narrow, somewhat flattened, their appendages linear or subulate. [Greek, 

 of golden aspect.] About 20 species, of N. Am. and Mex. Besides the following, 

 about 8 others occur in the southern and western U. S. 



Leaves elongated-linear, parallel-veined: achenes linear: involucre campanulate, 

 Pkint 3-9 dm. high, silvery-pubescent; leaves grass-like, 7-30 cm. long. 



1. C. graminifolia. 

 Plant 1-2.5 dm. high, woolly-pubescent; leaves rigid, 2-10 cm. long. 



2. C.falcata. 

 Leaves oblong, lanceolate, or linear, pinnately veined ; achenes obovate, or oval ; invo- 

 lucre hemispheric. 



Plant densely woolly-pubescent. 3. C. pilosa. 



Plants hirsute, or villous-pubescent. 



Heads numerous, corymbose-paniculate: eastern species. 4. C. Mariana. 

 Heads fewer, corymbose, or terminating the branches; western species. 

 Villous-pubescent: leaves oblanceolate, oblong, or lanceolate. 



Leaves acute. 5. C. camporum. 



Leaves obtuse. 6. C. villosa. 



Hirsute-pubescent. 



Leaves linear, acutish, short. 7. C. stenophylla. 



Leaves spatulate, obtuse. 8. C. hisfida. 



Pilose-pubescent; leaves oblong-lanceolate. 9. C. Nuttallii. 



i. Chrysopsis graminifolia (Michx. | Nutt Grass-leaved Golden Aster. 

 (1. F. f. 3652.) Slender, corymlxjselv branched above. Leaves 3-5 -nerved. -Inn- 

 ing, the basal one- 7-30 cm. long. 4-10 mm. wile, the upper much smaller, and 

 the uppernv.-t subulate and erect: heads several or numerous, about 1 cm. broad. 

 solitary at the end- of the branches; involucre campanulate-. its bracts glabrate; 

 achenes linear-fusiform. In dry soil, Del. to Fla., Ohio and Tex. Aug. -Oct. 



