(61) 
Aplopappus.—Involucre imbricate. Pap- 
pus l-seriate. Bristles rigid. 
Chrysopsis.—Involucre imbricate. Pap- 
pus 2-seriate, internal capillary, external 
scaly. 
Lessingia.—Ray-flowers enlarged, but 
not ligulate. 
Baccharis.—Diccious. Shrub. 
bbb. Parts of pappus definite in num- 
ber. 
Pentacheta.— Pappus of 5-scabrous 
bristles, shorter than the corolla, some. 
times depauperate. 
Grindelia.—Pappus aristate. 
ec. Branches of style not flat, but tap- 
ering, sometimes with an appendix. 
aaa. Scales of the involucre herbaceous. 
Chenactis.—Pappus paleaceous. 
Senecio.—Pappus capillary. 
bbb. Scales of the involucre scarious. 
Artemisia.—Receptacle slightly convex. 
Pappus 0. Akenes obovate with small 
epigynous disc. 
Tanacetum.—Receptacle slightly convex. 
Pappus 0. Akenes costate with large 
epigynous disc. 
