COMPOSITAE. 



Vol. III. 



2. Berlandiera lyrata Benth. Lyre-leaved 

 I terlandiera. Fig. .1430. 



Silphium Nuttaltianum Torr. Ann. Lye. N. Y. 2: 216. 

 Name only. 1827. 



Berlandiera lyrata Benth. PI, llartw. 17. 1839. 



Finely whitish-canescent, acaulcscent or sliort- 

 stemmed; scapes or peduncles slender, 3' -8' long, 

 bearing a solitary head, or rank 2. Leaves lyrate- 

 pinnatifid, obtuse, petioled, the terminal segment 

 usually larger than the lateral ones, the lower ones 

 very small, all obtuse, mostly erenate, sometimes 

 becoming green and glabrate above; head about i' 

 broad; inner bracts of the involucre much broader 

 than the outer, orbicular, or wider than long ; achenes 

 obovate, keeled on the inner face. 



In dry soil, Kansas to Texas, Arizona and Mexico. 



54. ENGELMANNIA T. & G. Fl. N. A. 2: 283. 1841. 



Perennial hirsute herbs, with alternate pinnatifid leaves, and corymbose slender-peduncled 

 rather large heads of both tubular and radiate yellow flowers. Involucre hemispheric, its 

 bracts imbricated in 2 or 3 series, the outer linear, loose, hirsute, ciliate, the inner oval or 

 obovate, concave, appressed, subtending the ray-flowers. Receptacle flat, chaffy, the chaff 

 subtending and partly enclosing the disk-flowers. Rays 8-10, pistillate, fertile. Disk-flowers 

 about as many, tubular, perfect, sterile, the corolla S-toothed. Anthers minutely 2-dentate 

 at the base. Style of the tubular flowers undivided. Achenes obovate, compressed, not 

 winged, i-ribbed on each face. Pappus a persistent irregularly cleft crown. [Named for 

 Dr. Geo. Engelmann, 1809-1884, botanist, of St. Louis.] 



A monotypic genus of the south-central United States. 



i. Engelmannia pinnatifida T. & G. Engel- 

 mannia. Fig. 4431. 



E. pinnatifida T. & G. Fl. N. A. 2: 283. 1841. 



Stem usually branched above, i-3 high. Basal 

 leaves slender-petioled, 4'-8' long, their lobes lanceo- 

 late or oblong, dentate or entire, obtuse or acutish ; 

 upper leaves smaller, sessile, less divided, the upper- 

 most sometimes entire, or with a pair of basal lobes; 

 heads usually numerous, about 1' broad; peduncles 

 l'-S' long; outer bracts of the involucre somewhat 

 in 2 series, the first linear, the second broadened at 

 the base. 



In dry soil, Kansas to Colorado, Louisiana, Arizona 

 and North Mexico. Reported as found along railroads 

 in western Missouri. May-Aug. 



55. PARTHENIUM L. Sp. PI. 988. 1753. 



Perennial, mostly pubescent or canescent herbs, or shrubs, with alternate leaves, and 

 small corymbose or paniculate heads of both tubular and radiate white or yellow flowers. 

 Involucre broadly campanulate or hemispheric, its bracts imbricated in 2 or 3 series, obtuse, 

 appressed, nearly equal. Receptacle convex or conic, chaffy, the chaff membranous, sur- 

 rounding the disk-flowers. Ray-flowers about 5, pistillate, fertile, their ligules short, broad. 

 2-toothed or obcordate. Disk-flowers perfect, sterile, their corollas 5-toothed, the style undi- 

 vided. Anthers entire at the base. Achenes compressed, keeled on the inner face, margined, 

 bearing the persistent rays on the summit. Pappus of 2-3 scales or awns. [Greek, virgin.] 



About 12 species, natives of North America, Mexico, the West Indies and northern South America. 

 Besides the following, some 3 others occur in the southern and southwestern United States. Type 

 species: Parthenium Hysterophorus L. 



