132 GAMOPETALOUS EXOGENS 



194. OIPl.OPAP'PlJS, Cassini. 

 [Gr. diploos, double, and Pappos, pappus; it being in two rows.] 

 Heads many-flowered ; rays 8 to 12, in a single series. Involucre 

 turbinate-campanulate ; scales imbricated, lance-linear, keeled, the 

 tips not herbaceous. Akenes flattish ; pappus double, the outer 

 row of short stiff bristles. Perennials: leaves alternate, entire; 

 heads solitary, or corymbose. 



f Rays mold-purple ; akenes siUcywttous ; inner pappus uniform. 



1. I>. liliariif olius, Hooker. Stem slender, terete, suffniti- 

 cose; leaves linear, rigid, keeled, serrulate-ciliate; heads solitary, 

 large. 



LlNABIA-LEAVED DlPLOPAPPUS. 



Stem 9 to 18 inches high, very leafy, roughish-puberulent, often purple, simple, 

 or with a few short corymbose branches at summit. Leaves about an inch long, 

 often glaucous beneath. Heads of flowers showy, large for the size of the plant ; 

 disk yellow ; pappus white or slightly tawny. 

 Hob. Hilly, rocky woodlands: frequent. Fl. Sept. Fr. Octo. 



) f Rays ochroleucous ; akenes smoothish; inner pappus unequal. 



2. I>. unifoellatus, Torr. $ Gray. Stem rather stout, striate- 

 angular; leaves long-lanceolate, acuminate; heads numerous, in 

 compound flat corymbs. 



D. amygdalinus. Fl. Cestr. ed. 2. p. 473. 

 UMBELLATE DIPLOPAPPUS. 



Stem 2 to 4 feet high, smoothish, or scabrous on the angles, branched above. 

 Leaves 2 to 4 inches long, slightly rerolute on the margin, narrowed to a short 

 petiole. Heads of flowers medium size, on slender roughish-pubescent peduncles ; 

 pappus whitish, or sometimes reddish-tawny, the hairs of the inner series slightl j 

 thickened at apex. 

 Hob. Moist thickets, and low grounds : frequent. FL Aug. Fr. Octo. 



3. O. eomiftilius, Darlingt. Stem slender, terete, smoothish, 

 sparingly and dichotomously corymbose-paniculate at summit; 

 leaves elliptic or rhombic-ovate, acute at both ends; heads lew, 

 middle sized. 



COKNUS-LEAVED DlPLOPAPPUS. 



Stem 1 to 2 feet high, often flexuose, pilose in lines. Leaves 2 to 4 inches long, 

 Bubsessile, fo'ughly hairy on the margin, midrib, and veins beneath. Heads of 

 flowers often in pairs, or the branches dichotomous ; pappus reddish-tawny, the 

 hairs of the inner series thickened at apex. 

 Hub. Woodlands ; clearings, &c. : frequent. Fl. Aug. Fr. Octo. 



2. Rays almost always yellow. 



195. SOL,IDA N C;O, L. 



[Latin, solido, to make firm, or unite; from its supposed healing virtues.] 

 Heads usually small and few-flowered; rays about 5, in a single 

 series. Involucre oblong ; scales generally appressed, and without 

 herbaceous tips. Akenes subterete, many-ribbed ; pappus single, of 

 equal capillary bristles. Receptacle small, mostly naked. Peren- 

 nials: stems commonly virgate; leaves subsessile, never cordate,; 

 heads commonly racemose-paniculate. 



