PIPER FLORA OF THE STATE OF WASHINGTON. 555 



Receptacle not conical. 



Heads slender-peduncled ; pistillate flowers apetalous . Cotula (p. 586). 



Heads clustered; corollas present. 



Pappus a short crown; heads corynibed Tanacetum (p. 58G). 



Pappus none; heads racemose or panicled Artemisia (p. 586). 



SENECIONEAE. 



Shrub; involucre of 4 to 6 concave bracts Tetkadymia (p. 59(J). 



Herbs. 



Leaves all or mostly opposite Arnica ( p. 5fl0) 



Leaves alternate. 



Flowers whitish or pinkish; heads raylcss. 



Leaves large, palmately lobed, mostly basal. 



Styles united nearly to the apex Petasites ( p 593). 



Styles united about half way Cacaliopsis ( p. 594 ). 



Leaves entire ; stems leafy. 



Heads about 10-flowered, coiymbed Litina (p. 594). 



Heads 4 to 6-flowered, paniculate Rainiera (p. 594 ). 



Flowers yellow; rays present (except in a few species of 

 Senecio). 



Livolucre hemispheric; heads solitary Crocidium (p. 594). 



Involucre campanulate; heads usually corymbose Senecio (p. 595). 



INULEAE. 



Pappus capillary, at least in pistillate flowers. 

 Plants dioecious or polygamo-dioecious. 



Pappus of staminate flowers clavate Antennaria (p. 601 ). 



Pappus of all the flowers similar Anaphalis (p. 606). 



Plants not dioecious; flowers all fertile Gnaphalium (p. 606). 



Pappus none. 



Receptacle naked; leaves large, green alcove Adenocaulon (p. ()07). 



Receptacle chaft'y ; leaves small, woolty Psilocarphus (p. 607). 



CYNAREAE. 



Akenes obliquely attached by one side at base. 



Heads not subtended by bristly leaves Centaurea (p. 608). 



Heads sessile, subtended by bnstly leaves Cnicus (p. 608). 



Akenes attached by the very base, not oblique. 



Filaments monadelphous below Sii-ybum ( p. ()09). 



Filaments distinct. 



Leaves and usually the involucral bracts prickly Cardhus (p. 609). 



Leaves not prickly. 



Heads globose, the l)racts hook-tipped Arctium (p. 61 1 ). 



Heads oblong, the bracts unarmed Saussurea (p. 611). 



EUPATORIUM. 



1. Eupatorium occidentale Hook. Fl. Bor. Am. 1: 305. 1833. 



Krystenia ocddentalis Greene, Leaflets 1 : 9. 1903. 



Type locality: "On the low hills between the north and south branch of Lewis and 

 Clarks River in stony places." Collected bv Douglas. 



Range: Washington and Idaho to California. 



Specimens examined: West Klickitat County, SiihsiLirf 865; Ellensburg, Elmer 423 

 1084; Klickitat River, SuJcsdorf, July 16, 1886. 



