388 COMPOSITAE. 



tomentose at the base, in the axils of the leaves and in the inflorescence, 

 otherwise glabrous; lower leaves petiolate, broadly ovate, 1-2 cm. long, 8-14 

 mm. broad, subcordate to cuneate at the base, crenate-serrate, rather thick 

 and firm in texture; petioles equalling or twice as long as the blade; upper 

 leaves more or less pinnate; inflorescence usually a close compact umbel; 

 heads discoid, about 1 cm. high in anthesis; tegules glabrous, their tips tinged 

 with purple; akenes glabrous. 



Widely distributed; Labrador, Rocky Mountains, British Columbia to 

 northern California. In our limits it has been collected on Mount Consti- 

 tution, San Juan County, Washington, Henderson, and at Deming, Whatcom 

 County, Washington, Flett. 



Senecio pauciflorus fallax Greenman. Stem erect, about 50 cm. high; 

 lower stem-leaves 3-8 cm. long, 1-2.5 cm. broad, pinnately parted with deep 

 broad sinuses between the lateral divisions, blackish or dark green in the dried 

 state; segments narrowly oblong to subovate, obtusely toothed; upper leaves 

 reduced to mere bracts; inflorescence cymose, few-headed; heads 8-10 mm. 

 high, radiate; involucre campanulate; tegules 18-21, linear, acute, 6-8 mm. 

 long, slightly purplish-tipped, glabrous; ray-flowers 10-12, yellow; disk- 

 flowers 50-60; akenes glabrous. 



In partial shade, Deming, Whatcom County, Washington, Flett; not other- 

 wise known. 



Senecio ductoris Piper. (S.fremontiT. & G.) Perennial, glabrous; stems 

 tufted from a stout woody caudex, erect or ascending, 10-20 cm. high; 

 leaves broadly obovate to spatulate or oblong, obtuse, dentate or incised, thick 

 in texture, 2-5 cm. long, the lower ones abruptly petioled, the uppermost 

 sessile; heads solitary or few together, the peduncles exceeding the leaves; 

 ray-flowers 8-12. 



Rocky places in the mountains at 2000-2500 m. altitude. 



Senecio websteri Greenman. Perennial, floccose-woolly to nearly glab- 

 rate; stems erect or ascending, 15-20 cm. high; basal leaves thick, ovate to 

 oblong-obovate; acute, sinuate-dentate to denticulate, 8-12 cm. long, narrowed 

 into a wing-margined petiole; cauline lanceolate, sessile, irregularly dentate; 

 heads solitary on peduncles 4-8 cm. long; involucre campanulate and caly- 

 culate; principal tegules linear-lanceolate, acute, sparsely woolly, 13-15 mm. 

 long; ray-flowers 12-15 mm. long; akenes glabrous. 



Known only from talus slopes on Mount Angeles, Olympic Mountains, 

 Washington, Webster. 



Senecio triangularis Hook. Perennial, glabrous throughout, 30-90 cm. 

 high; stem simple, leafy to the top; leaves narrowly or broadly triangular, acute 

 or acuminate, evenly dentate, truncate at base or the lower often cordate and 

 the upper cuneate, 5-15 cm. long, on short petioles; heads corymbed; involucre 

 6-8 mm. high; tegules linear-lanceolate, acute, pubescent at tip; ray-flowers 

 6-12, yellow. 



In moist places in the mountains, but occurring at sea-level neat the 

 mouth of the Columbia River. 



Senecio lugens Richards. Perennial, floccose-tomentose in the early 

 stages, more or less glabrate; stem 10-60 cm. high, leafy below, nearly naked 

 above; radical and lower leaves oblong-spatulate, 3-15 cm. long, 1-3 cm. 

 broad, obtuse or rounded at the apex, narrowed below into a winged petiole, 

 repand-callous, denticulate to subentire, thin, membranous, sparingly tomen- 

 tose or glabrous; stem leaves remote, gradually reduced, becoming bractei- 

 form; inflorescence a few-headed corymbose cyme; heads radiate, 1—1.5 cm. 

 high; involucre campanulate, calyculate, glabrous or subtomentose particu- 

 larly at the base; tegules about 13 and as well as the bracteoles conspicuously 

 black-tipped; akenes glabrous. 



