AmBoiDE*] SYNGEXES1A 473 



Vabious-leatkd Erigeroit. 



Root biennial ? Stem 2 to 3 or 1 feet high, striate, often angular, more or less 

 . . te< 8um etime3 nearly smooth below, corymbose at summit. Radical leaves 

 o to 4 inches long, and nearly as wide as long, ovate, somewhat scabrous and 



I se coarselv serrate-dentate, the teeth mucronate, petioles about twice as long 



the leaves, narrow-margined, dilated at base ; stem-leaves gradually smaller, 



i nr eolate acute, with 3 or 4 coarse serratures in the middle, pilose on the nerves? 



nd ciliatc on the margin, cunealely tapering at base, sessile,— the lower ones 

 , ovate and on margined petioles. Heads of flowers rather small, or middle- 



z »d- peduncles subterminal, axillary, corymbose, rather slender, hairy, leafless, 

 with a few lance-subulate appressed bracts; involucre pilose, the leaflets 

 lmce linear, acute, with membranaceous margins ; rays white, or tinged with 

 purple very narrow, linear. Akenes oblong, compressed, hirsute ; pappus whitish, 

 double, the outer one short, subpaleaceous. 

 Jlab. Pastures, and waste places: frequent. Fl. June— July. Fr. August. 



Obs. Some 8 or 10 additional species have been enumerated in the U. Slates ;— 

 tlio-iru I suspect a portion of them require to be revised. 



378. DIPLOPAPPUS. Cass. Less. Syn. p. 163. 

 [Gr. Diplos, double, <fc Pappos, pappus ; descriptiveof that portion of the florets.] 



Heath many-flowered. Involucre imbricated. Florets of the ray 

 pistillate, in a single series, — of the disk perfect, with the corolla reg- 

 ular. Pappus double. Akenes not beaked. Receptacle alveolate. 



L D. linahiifolius, Less. Stem terete, suffruticose, simple, or sub- 

 corvmbose at summit; leaves linear, entire, keeled, rigid, serrulate- 

 ciliate on the margin ; involucre somewhat loosely imbricate, the leaf- 

 lets lance-linear, obtuse. Hook. Am. 2. p. 21. 



Aster linariifolius. Jvlx. IVilld. Fursh, Ell. Biff el. Beck, &c. Icojt, 

 Bart. Am. 2. tab. 104. 



Jho, A. rigidus. Mx. Willd. Muhl. Fursh, Torr. &c. 

 Chrysopsis linariifolia. Nutt. Gen. 2. p. 152. 

 Uiplostephium linariifolium. JVees, Ast. p. 199. 



LlNARIA-LEAVED DlPLOPArPUS. 



Root perennial. Stem 9 to 18 inches high, slender, suffruticose, rigid, roughish- 

 puberulent, oflcn purple, simple, or with a few short corymbose branches at 

 summit. Leaves about an inch long, and i or 2 lines wide, sessile, linear, abruptly 

 acute, keeled, coriaceous and rigid, very scabrous on the margin, often glaucous 

 beneath. Heads of flowers rather large, solitary and terminal on the branches ; 

 branches erect, crowded, or subumbellate, hoary-pubescent and clothed with small 

 subulate-linear leaves; involucre minutely puberulent, the leaflets lance-linear, 

 obtuse, slightly keeled, pubescent-ciliate on the margin especially at apex, ths 

 apex mostly tipt with dark purple ; rays violet-purple ; disk yellow. Akene* 

 densely clothed with a whitish silky villus ; pappus white, or slightly tawny, in 

 a double series, both series setaceous, the outer one nearly as long as the aken*. 



Uab. Hilly, rocky woodlands : frequent. Fl. September. Fr. October. 



2. 1). amygdalitis, Less. Stem striate-angular, smoothish, corym- 

 bose-fastigiate at summit; leaves lanceolate, acuminate, attenuate at 

 base, subsessile, entire, scabrous on the margin, smooth beneath ; iu- 



40* 



