PIPER—FLORA OF THE STATE OF WASHINGTON. 595 
SENECIO. 
Annual; calyculate bracts of the involucre several, short, closely 
appressed, distinctly black-tipped.......... 2.222.222... 1. 8S. vulgaris. 
Biennials or perennials; calyculate bracts of the involucre few, 
not closely appressed, slightly or not at all black-tipped 
(except in S. lugens). 
Leaves, or some of them, pinnate or pinnatifid. 
Stems mostly leafy; leaves all pinnatifid or the lower- 
most undivided and orbicular; pubescence if any 
crisp-hairy, not woolly. 
Leafy to the inflorescence; leaves thin... ..... - 2. S. harfordii. 
Leafy at the base, naked above; leaves thick... 3. S. flettii. 
Stems leafy below, the upper leaves much reduced, 
mostly pinnatifid or pinnatisect ; pubescence if any 
white woolly. 
Herbage densely white woolly or floccose; pubes- 
cence usually persistent. 
. Pubescence persistent except in 8. fastigi- 
atus; leaves 1 to 2 em. broad. 
Petioles of the basal leaves usually 
shorter than the blades... .... 22... 12. 8. canus. 
Petioles of the basal leaves usually ex- 
ceeding the blades. 
Leaves entire to pinnate-lobed; up- 
per leaf surface usually perma- 
nently woolly _............- 13. S. howellii. 
Leaves entire or dentate; upper 
leaf-surface often glabrate..... . 14. S. fastigiatus. 
Pubescence floccose, more or less evanescent ; 
leaves 1 to 5 cm. broad. 
Involucral. bracts and bractlets not 
conspicuously black-tipped.... 2... . 15. 8S. elmeri. 
Involucral bracts and bractlets conspic- 
uously black tipped........ 22.2... 16. S. lugens. 
Herbage not densely lanate nor floccose; pubes- 
cence confined chiefly to the base of the stems 
and the leaf-axils. 
Heads discoid (except in subspecies fallax). 4. S. pauciflorus. 
Heads radiate. 
Stems 10 to 30 cm. high; heads usually 
solitary. 
Cauline leaves much _ reduced, 
bract-like 2.2.02 22 0.0.2.2... 5. S. subnudus. 
Cauline leaves when present broad 
and subamplexicaul, closely pec- 
tinate -... 22222222 eee. 6 S. ovinus. 
Stems 30 to 70 em. high; heads several 
to many. 
Leaves thin in texture, the lower 
distinctly ovate.....-...-..... 7. S. pseudaureus 
Leaves thick in texture the lower 
not ovate. 
Akenes hispidulous on the 
angles................. 11. S. balsamatae. 
