COMPOSITAE. 387 



Herbage not glaucous nor 

 fleshy, pubescent at 

 least when young; 

 leaves dentate or denti- 

 culate. 

 Leaves subcordate; ray- 

 flowers pale yellow. S. ochraceus. 

 Leaves not subcordate ; 

 ray-flowers darker yel- 

 low. S. exaltatus. 

 Tegules not black-tipped. 



Herbage more or less perma- 

 nently tomentulose. 

 Leaves entire or denticulate. 5. fastigiatus. 

 Leaves coarsely dentate. 5. fastigiatus macounii. 



Herbage glabrous or nearly so. 



Lower leaves oblanceolate. S. multnomensis. 

 Lower leaves ovate or obo- 

 vate. 

 Stem 30-50 cm. high. 5. pauciflorus fattax. 



Stem 10-15 cm. high. 5. suksdorfii. 



Senecio vulgaris L. Annual, sparsely pubescent or glabrous, usually 

 branched, 15-30 cm. high; leaves spatulate or oblong in outline, 1-3 cm. long, 

 half-clasping at base, pinnately-lobed, the lobes short and usually toothed; 

 heads few to many, in corymbs; involucre 5-7 mm. high, the inner tegules 

 linear, acute, often black-tipped, the outer few and short; ray-flowers 

 wanting; akenes puberulent; pappus copious, white. 



A common weed in waste ground; introduced from Europe. 



Senecio sylvaticus L. Annual, erect, 10-60 cm. high, slightly pubescent; 

 lower leaves oblong to lanceolate, lyrately pinnatifid, petioled; upper leaves 

 unequally pinnatifid, sessile, sagittate at the clasping base; heads corymbed, 

 slender-peduncled ; involucre cylindrical; outer tegules few or wanting, if 

 present not black-tipped; ray-flowers very short, yellow. 



Introduced from Europe; Portland, Oregon, Gorman. 



Senecio harfordii Greenman. Perennial, glabrous or essentially so through- 

 out; stem erect or ascending from a slender rootstock, 20-50 cm. high, some- 

 what glaucous, usually leafy; leaves mostly pinnately divided, with irregularly 

 lobed divisions, and these in turn dentate, including the petiole 4-14 cm. long, 

 1-5 cm. broad, thin in texture, and drying pale green; the lowermost leaves 

 often undivided, rotund and crenately lobed; uppermost leaves without 

 petioles; inflorescence a terminal corymbose cyme, few-many- (2-30-) headed; 

 heads mostly less than 1 cm. high, including the ray-flowers 1.5-2 cm. in 

 diameter; involucre shorter than the disk-flowers; tegules about 13, narrowly 

 lanceolate, 5-5.5 mm. long, acuminate, acute, glabrous; ray-flowers com- 

 monly 5, bright^yellow ; disk-flowers 18-25; akenes 2.5-3.5 mm. long, glabrous. 



Common in the gorge of the Columbia River, on moist rock cliffs. 



Senecio flettii Wiegand. Perennial, glabrous; stems 15-20 cm. high, 

 tufted; leaves mostly basal, oblong, 8-12 cm. long, petioled, pinnately parted 

 into irregular oblong incisely-toothed angular divisions; cauline similar, 

 smaller; heads 7 mm. high, several in a rather close corymb; tegules 10-12, 

 thin, acute; ray-flowers 2-4, dark yellow; akenes glabrous. 



In rocky soil in the Olympic Mountains, at about 2300 m. altitude, 

 abundant; Mount Rainier, near Cowlitz Cleavers, Miss Winona Bailey. 



Senecio pauciflorus Pursh. Perennial, 10-30 cm. high, slightly floccose- 



