476 



COMPOSITAE. 



[Vol. III. 



Heads 4" -6" high; involucre with several short outer bracts. 

 Leaves pinnatifid; plant viscid-pubescent; achenes glabrous. 

 Basal leaves obovate, orbicular, or spatulate, merely dentate. 



2,1. 5". vulgaris. 

 22. 5. viscosus. 

 Varieties of Nos. 9, 10 and 15. 



Sea- 



1. Senecio Pseudo-Arnica Less, 

 beach Senecio. (Fig. 4033.) 



Arnica maritima L. Sp. PI. 884. 1753. Not S. 



maritimus L. 

 Senecio Pseudo- Arnica Less. Linnaea, 6: 240. 1831. 



Perennial, somewhat fleshy; stem stout, mostly 

 simple, very leafy, 6'-3 high. Leaves obloug-ob- 

 ovate, or the lower spatulate, acute or obtuse at the 

 apex, 4 / -8 / long, Yz'-z' wide, densely tomentose 

 beneath, at least when young, repand-dentate or 

 denticulate, narrowed to a sessile and partly clasp- 

 ing base, or the lowest into margined petioles; 

 heads solitary, or several (2-7) and corymbose, 

 stout-peduucled, \]/ 2 '-2' broad, nearly i / high; in- 

 volucre broadly campanulate, its bracts lanceolate, 

 acuminate, mostly tomentose, commonly with sev- 

 eral subulate spreading ones at the base; rays 12- 

 15, linear, 3-toothed, conspicuous; disk-corollas 

 5-lobed; achenes glabrous; pappus dull. 



On sea-beaches and rocks near the sea, Maine, New 

 Brunswick and the lower St. Lawrence to Labrador 

 and the Arctic Sea. Also in Alaska and northern 

 Asia. July-Aug. 



2. Senecio frigidus L,ess. Arctic Senecio. 

 (Fig. 4034.) 



Senecio frigidus Less. Linnaea, 6: 239. 1S31. 



Perennial, more or less tomentose, or becoming 



glabrous when old; stem slender, 6 / -i2 / high, 



bearing a solitary head (rarely 2 or 3) Y%'-\' broad. 



Basal and lower leaves spatulate or obovate, i / -2 / 



long, petioled, obtuse, repand-dentate or entire; 



stem-leaves oblong to linear-lanceolate, obtuse or 



acute, sessile, mostly entire, smaller; involucre 



broadly campanulate, its bracts lanceolate, acute, 



with no exterior smaller ones; rays 10-16, 6 // -io // 



long, 3-toothed, linear-oblong, or cuneate at the 



base; achenes glabrous or sparingly pubescent; 



pappus white. 



Labrador and arctic America to Alaska. Also in 

 northeastern Asia. Summer. 



3. Senecio integerrimus Nutt. 

 Entire-leaved Groundsel. (Fig. 4035.) 



Senecio integerrimus Nutt. Gen. 2: 165. 1818. 



Perennial, more or less woolly when young, 

 glabrous or nearly so when old; stem stout, 

 i-4 high. Leaves entire, or sparingly dentic- 

 ulate, somewhat fleshy, the lower and basal ones 

 oval or oblong, obtuse or obtusish at the apex, 

 3 / -6 / long, \'-\% f wide, petioled, the upper 

 linear or lanceolate, acute, the uppermost very 

 small; heads numerous, corymbose, loug-pedun- 

 cled, 6 // -io // broad; involucre nearly cylindric, 

 4 // -5 // high, its principal bracts linear, acumi- 

 nate, green, usually with a few subulate outer 

 ones; rays 8-12, linear-oblong; achenes nearly 

 glabrous, pappus white. 



Minnesota and Manitoba to Wyoming and British 

 Columbia. June-July. 



