244 COMPOSITE FAMILY 



1. Eupatory Tribe (Eupatorieae). Heads discoid; the flowers all alike, 

 perfect, never yellow. Anthers without tails at base. Style-branches club- 

 shaped, obtuse. Includes our genera nos. 1 and 2. 



2. Aster Tribe (Astereae). Heads either discoid or radiate. Disk- 

 flowers commonly yellow, the rays when present either the same or different 

 color. Anthers without tails at base. Style-branches flattened and with a 

 distinct terminal appendage. Leaves alternate. Receptacle naked in our 

 species. Includes our genera nos. 3 to 13. 



3. Everlasting Tribe (Inuleae). Heads discoid and small (in ours). 

 Anthers notched at base, the lobes continued into tails. Style-branches 

 obtuse, without appendages. Pappus hair-like or none. Includes our genera 

 nos. 14, 15, 16, 17, and 18. 



4. Sunflower Tribe (Heliantheae). Heads either discoid or radiate. 

 Bracts of the involucre merely subtending the outer akenes, not enfolding 

 them; bracts of the disk present as scales or bristles among the flowers. 

 Anthers not tailed. Style-branches truncate or hairy-appendaged. Pappus 

 never hair-like nor of bristles, sometimes none. Leaves mostly opposite or 

 basal. Includes our genera nos. 19, 20, 21, 22, and 23. 



5. Tarweed Tribe (Madieae). Heads nearly always radiate. Bracts of 

 the involucre each embracing or enfolding an akene; bracts of the disk 

 often in a single circle between the ray and disk-flowers. Leaves opposite 

 or alternate. Otherwise as in Tribe 4. Includes our genera nos. 24, 25, 

 and 26. 



6. Sneezeweed Tribe (Helenieae). Characters nearly as in Tribe 4, 

 but the disk without bracts among its flowers and leaves often alternate. 

 Includes our genera nos. 27 to 32. 



7. Mayweed Tribe (Anthemideae). Distinguished from tribes 4, 5, and 

 6 by the more or less dry and papery or scaly bracts of the involucre, which 

 are imbricated. Akenes small, with pappus short and crown-like or none. 

 Herbage usually aromatic. Includes our genera nos. 33, 34, 35, and- 36. 



8. Groundsel Tribe (Senecioneae). Heads discoid or radiate, all the 

 flowers usually yellow. Bracts of the involucre nearly equal, not dry or 

 scale-like. Disk without bracts. Anthers without tails. Style-branches 

 truncate. Pappus of soft or rigid bristles. Includes our genera nos. 37, 

 38, and 39. 



9. Thistle Tribe (Cynareae). Heads discoid. Involucre imbricated. 

 Disk bristly. Anthers long-tailed at base. Style-branches obtuse. Pappus 

 mostly of fine bristles. Leaves alternate. Includes our genus no. 40. 



10. Chicory Tribe (Cichorieae). Corollas all strap-shaped. Anthers not 

 tailed. Herbage with milky juice. Leaves alternate or basal. Includes our 

 genera nos. 41 to 50. Key on p. 243. 



1. EUPATORIUM. 

 1. E. occidentale Hook. Stems somewhat woody, 1 to 3 ft. 

 long. Leaves partly alternate, ovate, few-toothed, 1 to 2 in. 

 long, short-petioled. Heads pinkish, in small clusters on 

 leafy branchlets, the involucre very short. Akenes 5-angled; 

 pappus of many rough hair-like bristles. — Yosemite Valley to 

 timber-line. There are some splendid clumps of this plant at 

 the foot of the upper Yosemite Fall. 



