MACLOSKIE I COMPOSITE. 827 



2. GAILLARDIA DONIANA DISCOIDEA Gris. 



Radiate; but by the setose receptacle and the style-branches having a 

 long, hirt appendage allied to G. scabiosoides. Plant 30 cm. tall. Leaves 

 narrowly or broadly lanceolate-elliptical, acuminate, entire, 5 cm. by 4 cm. 



(Argentina); N. Patagon. 



* 



3. G. MEGAPOTAMICA (Spr.) Baker. 



Stems inconspicuously pilose. Leaves lanceolate, entire. Heads dis- 

 coid, solitary, long-peduncled. Involucral scales lanceolate, shorter than 

 the disk. Pappus-pales 9-10, lanceolate, 2-3 times larger than the achene. 



The largest species: " Tscho'ike catschu," Rhea-grass, its infusion is 

 sudorific. 



(S. Brazil and Argentina, near rivers) ; N. Patagon. and by Bahia 

 Blanca. 



4. G. SCABIOSOIDES Griseb. (= G. megapotamica?]. 



Heads discoid, solitary, long-peduncled. Leaves oblong, deeply pin- 

 natifid ; the segments lanceolate, entire or sparsely toothed, Involucral 

 scales lanceolate, shorter than the disk. Pappus-pales 9-10, lanceolate, 

 2-3 times exceeding the achene. (Leaves varying, sometimes entire.) 



(Argentina) ; N. Patagon. 



5. G. SCABIOSOIDES RADIATA. 



Stem 22 cm. high, leafy at base. Leaves bipinnatisect, ovate in out- 

 line, to 4 cm. long. Ray exsert, its ligules trifid. 

 (Argentina, common by rivers) ; N. Patagon. 



46. TAGETES Linn. South American Marigold. 



Glabrous herbs, with oil-glands in the involucres and in the leaves. 

 Leaves mostly opposite and mostly pinnately dissected. Flowers yellow. 

 Involucre cylindraceous, i -seriate, connate. Receptacle naked. Ray- 

 flowers entire or 2-cleft. Anthers basiobtuse. Style-branches truncate- 

 tufted or briefly appendaged. Achenes linear, attenuate with a basal cal- 

 lus. Pappus-pales 56, differing. 



Species 20, Mex. and S. Amer., often cultivated in gardens. 



(DC. Prodr. gives as the generic character, "leaves opposite or alter- 

 nate, " and several of its species are cited with alternate leaves. Benth. 



